C. Filters, Fittings, Hoses, Seal Rings

April 16, 2021

Inline Fuel Filters

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C1 3/16″ inline filter, round screen type, 12-1585 $6

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C2 1/4″ inline filter, round screen type, 15-1520 $6

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C3 1/4″ inline filter, 90 deg paper type, 15-1796 $3

Screw-on Adaptors

C4: 10×1 male to 12×1 male adapter $12 plus $2 for the seal ring

C4 adapter
10 to 12 $12

C4 adapter installed

Sometimes a gas tank has a 10 x 1 threaded gas valve hole that is close to a “wall”, preventing the gas valve from screwing on or off, unless the tank is removed. Sometimes removal of the tank is very difficult, like on a Cimatti City Bike. In those cases an adaptor fitting can be used to convert to a turn-buckle type gas valve, where only the nut turns.

A 10mm washer made of plastic, paper, or other semi-hard material provides the seal, not the threads.

Screw-on Extenders

What is an extender and when is it needed? An extender is a piece that moves a M10-1.0 screw-on valve away from the tank.

1. For when the petcock handle hits the tank in the up (reserve) position. Most original valves had reserve pointing up, ↑reserve off→ on↓. Original valves with an up position often had to be moved away from the bottom of the tank with an extender, to allow the handle to go straight up and not hit the tank. Some tanks had a welded-on extender, a short pipe with a 10×1 threaded hole. Some original valves had screw-on extenders.

For this reason, most modern replacement petcocks do not have an up position. They have ←reserve on↓ off→. That eliminates the need for an extender, a cost saving improvement.

2. For when the petcock passes through a hole in a body panel. The correct extender length lowers the petcock to the level needed to pass through a hole in a cover panel. So the petcock is hidden except for the handle, for a clean look.

3. For when something prevents installation. Sometimes part of the gas tank or frame prevents the screw-in petcock from screwing in. An example is Peugeot 102.

..part# price extension
C10.11 $13 11.0 mm = 10.0 mm extender + 1 mm seal washer
C

C10.12 $14 12.0 mm = 10.0 mm extender + 2 mm seal ring
C

C10.145 $13 14.5 mm = 13.5 mm extender + 1 mm seal washer
C

C10.155 $14 15.5 mm = 13.5 mm extender + 2 mm seal ring
C

C10.195 $14 19.5 mm = 13.5 mm extender + 6 mm cup seal
C10.195 $00 1980 Peugeot 102 SP (required)

C10.22 $26 22.0 mm = 10+10 extenders + 1+1 seal washers
C

C10.23 $27 23.0 mm = 10+10 extenders + 1+2 seal washers
C

C10.25 $13 25.0 mm = 24.0 extender + 1 mm seal washer
C

C10.26 $14 26.0 mm = 24.0 extender + 2 mm seal ring
C

C10.30 $14 30.0 mm = 24.0 extender + 6 mm cup seal
C

Seal Rings

C13 seal ring 10-14 x 6 w/metal cup 10.4-16-4.5 $2
continued soft, for light tightening, seals over a wide range

C14 seal 0-ring 10-15-2.5 w/metal cup 10.4-15-3.5 $2
continued soft, for light tightening, seals over a wide range

C15 seal ring 10.0 id, 13.7 od, 1.8-2.3 tall nylon $2.00
continued hard, can hold up to tightening pressure

C16 seal ring 7.5 id, 10.5 od, 1.7-2.1 tall nylon $2.00
continued hard, can hold up to tightening pressure

C17 seal ring 7.9 id, 10.4 od, 1.4-1.8 tall fiber $2.00
continued hard, can hold up to tightening pressure

C18 seal ring 8.0 id, 11.7 od, 0.0-1.0 tall fiber $2.00
continued hard, can hold up to tightening pressure

Many more of these are listed in Parts/Engine/Seals and O-Rings

Turnbuckle type nuts (forward and reverse thread)

These special nuts have “forward” right-hand thread on one side and “reverse” left-hand thread on the other side. The left thread side screws onto the valve, and the right thread side screws into the tank. This allows a screw-on valve to be tightened without the valve turning, and allows the valve to face any direction 360 degrees after tightening.

C20: 22 x 1 internal right to 22 x 1 internal left turnbuckle nut $7 chrome

C21: 16 x 1 internal right to 16 x 1 internal left turnbuckle nut $2

This turnbuckle type (LH and RH) nut is used on all 16mm female (internal-thread) moped gas valves.

C21a: 14 x 1 internal right to 14 x 1 internal left turnbuckle nut ??

C22: 12 x 1 internal right to 12 x 1 internal left turnbuckle nut $1

This turnbuckle type (LH and RH) nut is used on all 12mm female (internal-thread) moped gas valves.

C23: 22 x 1 internal right to 16 x 1 internal left turnbuckle nut N/A

This new nut was made improperly. The 16 x 1 left thread ID is to big (so it would strip off the soft alloy threads of the petcock when fully tightened) and the center-line is not straight (so the sealing surface of the petcock is at an angle to the sealing surface of the tank).

C24: 16 x 1 internal right to 12 x 1 internal left turnbuckle nut N/A

There are two things to watch out for with these dual diameter dual thread nuts.

1. There are two ring-shape sealing surfaces on the petcock that must be close to the same height when the nut is fully tightened. The outer

2. The ring-shape sealing surface on the gas tank must be wide enough to press against both of the petcock sealing surfaces.

Hoses and Parts

C29 clear nylon hose 3/16″ id 5/16″ od $1/foot fits moped spigots 5mm, no clamps

C30 soft aluminum tubing 1/8″ od $0.50/inch for making reserve tubes, longer or curved upward
continued easily bent, often must be ground slightly for press fit into hole

C31 “Y” connector for 3/16″ hose $3 for joining two fuel lines into one upward
continued for making a clear hose external fuel gauge, or for dual gas tanks

D. Gas Valve Inner Seal Disks

April 16, 2021

OMG front

OMG rear

Inner Seal Discs

These rubber disks are hard and deteriorated after 30 years. The rest of the petcock is metal and lasts forever, or has round seal rings that are relatively easy to find.

Cross Referencing Hopes: The sizes, applications, and possible sourcing of these vital rubber disks is being studied. It is hoped that some of the common moped gas valves might use the same rubber seal as some kinds of Honda, Kawasaki, Suzuki, Yamaha, or others. When that information becomes available, it will be posted here. Then anyone could order a seal disk for a small brand name bike from a big brand name parts supplier.

Flipping: Old rubber inner seal disks get hard, shrink, and become deformed. Some can be flipped over to expose a fresh unused side.

Karkoma 16x1 spigot back with decomposed urethane disk

Karkoma 16×1 spigot back with decomposed disk

Vintage Karcoma: Left, an actual original 1970’s Karkoma (Germany) gas valve from a 1979 Kynast moped, with only 50 miles of use. 30+ years of sitting with old, rotten gasoline premix has completely clogged the passageways with hard tar, and decomposed the seal disk to where it broke when the valve was disassembled. Part of the seal disk shaped like a smile broke off and stuck to the movable plate with handle. Usually when these get sticky the handle ends up getting snapped off, in addition to the seal disk crumbling and the holes clogged. This is the kind that uses a 3.3mm tall lip on the outer edge of the 2.0mm tall by 13.7mm diameter seal disk D4. Later 1980’s Karkoma valves did not have the lip. For those the D4 early seal disk lip must be carefully ground off. Even the last few new old stock 1970’s Karkoma seal disks, once clear orange, now cloudy gold, are brittle and crack and crumble easily in your fingers. Too bad. That is why disk D4 is N/A not available.

Seal disks D1 to D6

Seal disk D8

D9 OMG seal disk 13.9 x 1.6
3 rings stick up from holes
they fit inside valve holes
to keep disk from rotating

# price OD x thickness style Fuel Petcock Inner Seal Disks .
D6a none 13.4 x 2.3 3 holes shrunk aftermarket
D4x none 13.7 x 2.0 3.3 outer lip, 70’s Karkoma (Germany)
D7x none 13.7 x 2.0 3 holes no outer lip, 80’s Karkoma (Germany)
D9x none 13.9 x 1.6 3 holes 3 lips OMG (Italy) for most replacements
D5x none 14.0 x 2.0 3 ∅3.5 holes 70’s Paioli for valve A33
D5a none 14.9 x 3.2 3 holes shrunk unknown
D2a none 15.8 x 2.8 4 holes very shrunk D2 from ’65 Honda CA200
D2b none 16.2 x 2.8 4 holes shrunk D2
D2c $22.0 16.3 x 3.0 4 holes D2 with the 4 holes widened
D2x $8.00 16.3 x 3.0 4 holes Honda 16957-ZE1-812 replaces 16955-011-010, 16955-028-004
D2x $0.00 16.3 x 3.0 4 holes fits 60’s-70’s Honda’s and Trac Eagle (Korea), Angel (Taiwan)
D8a $5.00 18.6 x 3.0 3 holes shrunk D8
D8x $12.0 18.8 x 3.1 3 holes blue Derbi (Spain) valve=18.5
D19 none 18.8 x 2.4 4 holes KL-18-6646 Kawasaki 43049-1017
D1x none 19.3 x 3.0 8 holes Honda 16115-001-004 60’s Cub
D10 $11.0 20.4 x 3.3 4 holes Honda 16955-268-020 another view
D10 $0.00 20.5 x 3.2 4 holes Indian (Taiwan) for valve A35
D3x $7.00 22.0 x 2.3 2+2 holes Piaggio 013836 vintage Vespa scooters
D11 none 22.3 x 3.5 4 holes General (Taiwan) for valve A28
D17 none 22.6 x 2.4 5 holes KL-18-6644 Kawasaki 11009-1188
D18 none 23.0 x 2.4 2 holes + slot KL-18-6645 Kawasaki 43049-1066
D16 none 28.5 x 2.4 5 holes KL-18-6643 Kawasaki 11009-1194
D21 none 00.0 x 0.0 Honda 17993
D22 none 00.0 x 0.0 Honda 16955-HA2-005 close up view
D24 none 00.0 x 0.0 Kawasaki 92065-094
D25 none 00.0 x 0.0 Kawasaki 92065-055
D26 none 00.0 x 0.0 Suzuki 44341-18450
D27 none 00.0 x 0.0 Suzuki 51455-010
D28 none 00.0 x 0.0 Yamaha 47X-24523-00
D29 none 00.0 x 0.0 Yamaha 137-24523-00

Seal disks D16 to D19:
These four KL Supply petcock inner seal disks have dozens of motorcycle and ATV applications, and hopefully some mopeds.

Valve A33 with disk D5

D5 seal disk

Gas Valves (Petcocks)

April 16, 2021

1. Gas Valves listed by Type
2. Gas Valves listed by Application
3. Gas Valve Parts
3. Inline Filters
3. Seal Disks
3. Extenders
——– < partition> ——–
4. Gas Valve Information

1. Gas Valves listed by Type

Here 53 gas valves (petcocks) are listed by size and type.
Click on the part number to see photos, info and price.
All valves use 3/16″ (5mm) I.D. fuel hose, unless noted.

part# thread Screw-on Gas Valves
0A1 08-1.00 male spigot L or R push-pull
0A2 10-1.00 male spigot down
0A3 10-1.00 male spigot back
0A4 10-1.00 male spigot left
0A5 10-1.00 male spigot right
0A6 10-1.00 male spig. back medium shaft
0A7010-1.00 male spig. down 15 extender
0A8 10-1.00 male spig. down 20 extender
A8b 10-1.00 male spigot left 20 extender
A8c 10-1.00 male spig. right 20 extender
0A9 10-1.00 male spig. down 26 extender
A10 10-1.00 male spigot left 26 extender
A11 10-1.25 male spigot right
A12 12-1.00 male spigot down
A13 12-1.25 male spigot down
A13b12-1.25 male spigot left
A14 12-1.00 female spigot down
A15 12-1.00 female spigot back
A16 12-1.00 female spigot back clear trap
A17 12-1.00 female spigot left
A17b12-1.00 female spig left ext. round knob
A18 12-1.00 female spigot right
A19 12-1.00 female spigot back short shaft
A20 12-1.00 female spigot right long shaft
A20t 12-1.00 female spig. left medium shaft
A20b12-1.00 female spigot right short shaft
A21 12-1.00 female sp. right medium shaft
A22 12-1.00 female spigot right long shaft
A23 12-1.00 female side mount Ciao
A24 12-1.00 female side mount Puch
A25 14-1.00 female spigot down
A26 14-1.00 female spigot left short reserve
A26b14-1.00 female spigot left
A27 14-1.00 female spigot right 1/4″ hose
A28 14-1.00 female spigot back
A29 14-1.00 female side mount Trac
A30 14-1.25 male spigot down 1/4″ hose
A30b14-1.50 male spigot back
A30c14-1.50 female spigot down
A31 16-1.00 female spigot down
A31b16-1.00 female spigot down detachable shaft
A32 16-1.00 female spigot back
A33 16-1.00 female side mount KTM USA
A34 16-1.00 female side mount KTM Euro
A35 16-1.50 female side mount Indian
A36 16-1.50 female spigot right
A37 16-1.50 female spigot down
A38 22-1.00 female spigot down
A39 22-1.00 female sp. down medium shaft
A40 14-1.00 vacuum-automatic
A41 16-1.50 vacuum-automatic
part# Clamp-on, Bolt-on, Remote Valves
0B1 13mm clamp-on spigot right
0B2 15mm clamp-on spigot down 1/4″ hose
0B5 12mm clamp-on spigot back
0B6 12mm clamp-on spigot right
0B7 12mm clamp-on spigot down
B13 bolt-on petcock side mount Angel
B15 remote petcock (in-line) Trac
B16 remote petcock (in-line) Suzuki

2. Gas Valves listed by Application

Here are 177 applications (what bikes take what valves).
Click on the part number to see photos, info and price.
These are US models (sold new in the USA), unless noted.

orig. use
A15 A15 1980-82 AMF Roadmaster 130
0A8 0A8 1980-83 AMF Roadmaster 140, 141
A28 A26 1978-84 AMS (Her Chee) Sierra 50, Tahoe 50
A13 A13 1978-80 Angel (TYM) BP48, BP48-S (tube frame)
B13 B13 1977-78 Angel (TYM) AP48 (sheet metal frame)
0A8 0A2 1978-80 Arciero (Italtelai) Eagle, Hawk, Sea Gull
A00 0A4 1978-80 Arciero (Italtelai) top tank
A17 A17 1999-02 Avanti (Mont) Kobra, Mont, Autopower
A17 A17 1999-02 Avanti (Mont) Super Sport, Cosmo Stinger
orig. use
0A3 0A3 1977-80 Baretta (Piccoli) Magnum, also A4 or A2
0A3 0A3 1977-79 Baretta (Piccoli) 22, 38 (regular tube frame)
A21 A21 1977-80 Baretta (Piccoli) 44, 45 (large mono-tube frame)
A14 A14 1976-78 Batavus VA (step thru), Bronco
A15 A15 1977-80 Batavus HS50, Starflite, Regency
0A2 0A2 1969-73 Benelli Buzzer, Hornet, Woodsbike, also A4
0A2 0A2 1967-77 Benelli Dynamo, Compact, Hurricane, also A4
0A2 0A2 1976-77 Benelli Blazer, Bobo, also A3 or A5
A0 0 A20 1976-80 Benelli (SEIMM) G2, C2 (mono-tube frame)
A18 A18 1976-79 Bermuda (Flandria) vertical type mounted sideways
A37b A31b ’77-79 BETA L, SL, SL-5
0A8 0A2 1977-80 Bianchi (Italtelai) Stardust (step-thru)
A00 0A4 1978-80 Bianchi (Italtelai) Satellite (top tank)
0A4 0A4 1976-80 Bianchi (Italtelai) Snark (step-thru)
A00 0A3 1971-73 Broncco (Fantic) Diablo
orig. use
0A2 0A2 1977-79 Carabela (Acer-Mex) Motomatic
A14 A14 1977-80 Casal K196 (top tank)
0A4 0A4 1976-77 Cimatti Twin Sport (dual tanks, front tank)
A17 A17 1977-78 Cimatti Town Bike (single front tank)
A17 A17 1978-79 Cimatti Twin Sport (single front tank)
A18 A18 1976-79 Cimatti City Bike (with original 10-12 adapter)
0A2 0A2 1976-79 Cimatti City Bike (no adapter, difficult to install)
A28 A26 1978-80 Clinton (Jui Li) ST (step-thru) (also A28)
A17 A17 1979-80 Columbia Commuter, Open Road (mono tube frame)
A18 A18 1976-80 Columbia Commuter, Open Road (sheet fr.) also A15
A18 A18 1978-80 Columbia Imperial, Western Flyer, Yard Man (sheet)
A18 A18 1980-81 Columbia Medallion, Western Flyer Apache 3000 (t.t.)
0A2 0A2 1977-79 Concord (Fantic) XKE (mono-tube frame)
0A2 0A2 1979-80 Concord (Fantic) Freedom, Invader (can be 10 or 12)
A14 A14 1979-80 Concord (Fantic) Freedom, Invader (can be 10 or 12)
0A3 0A3 1977-79 Cosmo (Piccoli) Blazer 1, 2 (step thru)
0A3 0A3 1978-79 Cosmo (Piccoli) Colt 1, 2, 5 (top tank) also A4 or A2
0A3 0A3 1979-80 Cosmo (Malaguti) Colt 3,3A,4,4B (top tank) also A4, A2
A00 A00 1980-80 Cosmo (Testi) Amico (step thru enclosed body)
A17 A17 1999-02 Cosmo (Mont) Stinger, Avanti Supersport (top tank)
orig. use
0A3 0A3 1976-79 DEMM Smily, Scout, also A4
0B2 0B2 1976-89 Derbi Variant SL, Variant SLE, TT, Variant Sport
A30 A30 1978-86 Derbi C5, RD50, Sport Laguna (top tanks)
0A4 0A4 1974-79 Di Blasi R2 folding mini-cycle (on right side)
0A5 0A5 1979-97 Di Blasi R7 folding mini-cycle (on left side)
0B5 0B5 1997-00 Di Blasi R7E folding mini-cycle (on left side)
0B6 0B6 2000-on Di Blasi R7E-V2 folding mini-cycle (on left)
orig. use
A18 A18 1982-82 Eagle (Hercules) I, II (step thru) also A15
A18 A18 1982-82 Eagle (Hercules) III (top tank) also A15
orig. use
0A3 0A3 1977-79 F. Morini (Lem) Chembol, also A4
A32 A32 1977-79 Flying Dutchman (Kynast) (tube frame)
A32 A32 1976-77 Flying Dutchman (Sparta) (sheet frame rear tank)
A31 A31 1977-80 Flying Dutchman (Sparta) (sheet frame front tank)
A33 A33 1977-80 Foxi (KTM) Deluxe, US models only
A31 A31 1977-80 Foxi (Sparta) GT, GT Sport, Flying Dutchman
A28 A26 1979-80 Foxi (Jui Li) 47 (top tank) also A25
0A3 0A3 1977-78 Foxi (Testi) Silver Foxi (mono-tube) also A2
orig. use
0A5 0A5 1977-80 Gadabout (Moto BM) also A3
A15 A15 1973-78 Garelli Eureka, Sport, Gran Sport, Gulp
A15 A15 1978-80 Garelli Sport, Rally Sport also A17
A17 A17 1978-80 Garelli VIP
A15 A16 1978-86 Garelli Super Sport XL, LTD, SSXL
A15 A21 1984-85 Garelli Basic (needs long reserve tube)
A19 A19 1980-86 Garelli Sport, Rally Sport, Rally SL
A15 A15 1983-86 Garelli Monza GT
A32 A32 1970-73 Gemini SST 80 mini trail
A28 A26 1979-85 General (Jui Li) 5-Star (top tank) also A25
A28 A26 1979-85 General (Jui Li) 5-Star ST (step-thru) also A28
0A3 0A3 1984-86 General (Moto Meteora) TE (step thru)
0A3 0A3 1977-80 Gitane (Testi) OKS, Sport (tube frame) also A4 or A2
0A3 0A3 1977-80 Gitane (Testi) CL200 Confort (sheet frame) also A4, A2
0A3 0A3 1977-80 Gitane (Testi) Cricket, Super Sport (mono-tube) also A2
A28 A26 1978-80 Grycner (Jui Li) and re-brands
orig. use
0A2 0A2 1965-66 Harley Davidson M50
A15 A16 90’s-00s Hero (Majestic) Pacer, Panther also A17
A17 A17 90’s-00s Hero (Majestic) Gizmo
A25 A25 1979-81 Honda NA50 Express II
A26 A26 1977-83 Honda NC50 Express
A36 A36 1982-83 Honda NC50I Express Iowa
A40 A40 1981-82 Honda NX50 Express SR 16950-187-671
A27 A27 1982-82 Honda MB5 (MB50)
A37 A37 1968-78 Honda Z50 Mini Trail, QA50, MR50
A16 A16 1977-83 Honda PA50 Hobbit
A18 A18 1966-75 Honda P50, PC50 Little Honda
orig. use
A35 A36 1979-83 Indian (Merida/Mira) AMI-50
A24 A24 1976-78 Intramotor-Gloria Blanco (sheet frame)
0A3 0A3 1976-79 Intramotor-Gloria Scout also A4 or A2
0A5 0A5 1976-76 Itom Automatic
orig. use
A38 A38 1970-82 Jawa Babetta 28, 206, 207
A32 A32 1980-83 Jawa Supreme, Supreme II (top tank)
A32 A32 1984-90 Jawa 210 Sport, Alley Cat (top tank)
A15 A18 1978-79 JC Penney (Kromag) Pinto, Swinger
A28 A26 1978-80 Jui Li Honey 50 and compatibles
orig. use
A14 A14 1995-05 Kinetic TFR, TFR-USA also A16
A18 A18 1987-93 KKM (Columbia remake) Mopet
A39 A39 1995-99 Korado (Manet) (mono tube frame)
A00 A14 1977-80 Kreidler Flory MP9, MP19 also A18
A33 A33 1977-80 KTM Foxi Deluxe, US models only
A34 A34 1974-90 KTM Foxi, Hobby, Euro models only
orig. use
A28 A26 1977-80 Lazer (Jui Li) Sport 50, Sport 50 ST
A28 A26 2009-on Lazer (Bashan) SSR Lazer 5 (step thru)
orig. use
0A3 0A2 1976-79 Maico (Moto Bimm) MPI also A3
0A3 0A3 1977-80 Malaguti Commuter (step thru) also A4
0A4 0A4 1978-79 Malaguti Pilot (top tank)
0A3 0A3 1976-77 Malanca Roxi
A28 A26 1979-80 Moprix (Pou Yen) Speed Bird (step thru)
A27 A25 1979-80 Moprix (Pou Yen) Moprix (top tank)
0A1 0A1 50’s-60s Motobecane/Motoconfort
0A2 0A2 1978-79 Motobecane Model 7
0A3 0A3 1971-80 Motobecane 40, 50, 50V, Moby, Traveler, Le Moped
A15 A15 1980-81 Motobecane Sebring (Italian top tank)
0A3 0A3 1977-79 Motobee (Testi) RS100 (step thru) also A4
0A3 0A3 1977-79 Motobimm (Bimotor) (step thru)
A15 A15 1971-80 Moto Guzzi (SEIMM) Chiu, Robin (sheet frame)
A00 A20 1977-80 Moto Guzzi (SEIMM) Robin (mono tube frame)
A15 A15 1985-90 Motomarina (Moto Meteora) Sebring (top tank)
0A3 0A3 1987-89 Motomarina (Moto Meteora) Raven (step thru)
0A3 0A3 1987-89 Motomarina (Moto Meteora) Tri-Power (3-wheeler)
0A2 0A2 1978-79 Motron Sprint, Medalist, Classic also A3, A5
0A8 0A2 1980-81 Motron Medalist, Classic also A3, A5
A14 A14 1979-82 Murray (all models) (step thru) also A17
orig. use
0A3 0A2 1977-82 Negrini Harvard, Harvard II (step thru mono tube) also A4
0A3 0A3 1977-82 Negrini Leprotto, Gazelle, Gazelle II, III (step thru) also A4
0A2 0A3 1977-82 Negrini MX Sport, MX Sport II (top tank) also A3, A4
A00 0A6 1976-78 NVT Easy Rider ER, ER2, Scorpion (mono tube)
orig. use
A27 A26a1978-80 Oakwood (Pou Yen) Catalina
A00 A31 1977-80 Odyssey (Solo) 32/1, 40/1, 40/2 (step thru)
orig. use
0A7 0A2 1978-80 Pacer (Italtelai) Deluxe P14 (step-thru)
0A8 0A5 1978-80 Pacer (Italtelai) Sport P78 (mono-tube) also A4
0A0 0A4 1979-80 Pacer (Italtelai) Super Sport (top tank)
A8c A8c 1980-80 Peugeot 102SP also A8
0A2 0A2 1976-83 Peugeot 103, 103SP, TSM
A12 A12 80’s-90s Peugeot Vogue (Euro model)
A32 A32 1978-86 Puch Magnum XK, MkII, II, Cobra 1, 2 (top tanks)
A24 A24 1969-86 Puch Maxi, Sport, Newport models (sheet frame)
A31 A31 1954-68 Puch MS50, VS50, VS50D (Euro models) (sheet frame)
A39 A39 1995-99 Puch (Manet) Korado (mono tube frame)
A24 A24 1989-92 Puch (Piaggio) Super Maxi (Euro model)
orig. use
0A2 0A2 1977-79 Rizzato Califfo de Luxe, La Mopette (step thru)
orig. use
A18 A18 1976-80 Sachs (Hercules) P1, Westlake, Sundancer (sheet frame)
A15 A15 1976-80 Sachs (Hercules) M4, Balboa , Suburban (tube frame) also A18
A15 A15 1980-83 Sachs (Hercules) Seville (sheet frame)
A18 A18 1980-83 Sachs (Hercules) Prima (step-thru)
A18 A18 1980-84 Sachs (Hercules) Prima G3 (top tank)
0A5 0A5 1975-78 Safari (MZV) Ridget, Super, Super Extra (mono tube) also A3
0A5 0A5 1978-80 Safari (MZV) Leader, Cobra (mono tube) also A3
0A3 0A3 1978-91 Safari (MZV) Automix, 300MT (top tanks) also A4, A2
0A3 0A3 1978-91 Safari (MZV) 400MT (has two petcocks, top tank and frame tank)
0A3 0A3 1978-91 Safari (MZV) Variomatic, Commando (top tanks) also A4, A2
0A0 0A6 1977-79 Scorpion (NVT) SC1, SC2, SC2X (mono tube)
A14 A14 1978-79 Sears (Kromag) Free Spirit (all models) also A15
A31 A31 1956-69 Sears (Puch) Allstate Mo-Ped (MS50)
A31 A31 1965-67 Sears (Puch) Allstate Sabre (VZ50) and others, see Puch
0A8 0A2 1978-80 Snark (Italtelai) Standard, Deluxe (step-thru)
0A8 0A4 1978-80 Snark (Italtelai) Satellite (top tank)
0A6 0A6 1970’s Solex Tenor 8000 (Laura M54)
0A6 0A6 1974-75 Solex Tenor 8000 (Laura M56)
A31 A31 1977-83 Sparta Foxi GT, Buddy, Lucky
A32 A32 1974-77 Sparta Lucky (rear tank)
A13 A13 1977-78 Speed Bird (TYM) BP48, BP48-S (tube frame)
A28 A26 1976-78 Sprinter (Tsing Hua) and compatibles
A30c A30c ’67-69 Suzuki B100P (120cc)
B16 B16 1980-91 Suzuki FA50 Shuttle
orig. use
0A7 0A7 1987-94 Tomos Bullet TT, TTLX, Sprint TT
A17 A17 1974-95 Tomos Bullet A3, A35 (all step thru)
A10 A10 1992-95 Tomos Colibri (A35 engine)
A17 A17 1996-06 Tomos Sprint (A35 engine)
A17b A17b ’94-13 Tomos Targa LX, Tomos LX, LX (top tanks)
A20 A20 1996-06 Tomos Targa, Tomos, ST (A35 engine)
A18 A18 2007-13 Tomos Sprint, ST (A55 engine)
A18 A18 2001-13 Tomos Revival, Streetmate, Arrow
A18 A18 2017-18 Tomos Sprint, Sprint Classic, Racing TT
0B1 0B1 1998-02 Tomos TX50, Super Tom, MC36, MC50, MC80
B15 B15 1982-85 Trac (Kia) Clipper (rear tank remote petcock)
B15 B15 1983-85 Trac (Kia) Hawk, Sprint (top tank remote petcock)
A29 A26 1982-85 Trac (Kia) Eagle (step thru sheet frame)
B15 B15 1985-88 Trac (Daelim) Clipper, Escot (step thru rear tank)
A28 A26 1984-88 Trac (Daelim) Image, Sprint (top tank) also A25
B15 B15 1985-89 Trac (Daelim) Olympic, Liberty, Blitz (step thru remote)
A26 A26 1989-90 Trac (Daelim) Metro (step thru rear tank)
orig. use
A18 A18 1977-79 Vespa (Piaggio) Bravo (metal tank)
0B1 0B1 1975-78 Vespa (Piaggio) Bravo (plastic tank)
A23 A23 1967-90 Vespa (Piaggio) Ciao, Ciao PX
A21 A21 1978-86 Vespa (Piaggio) Grande, Grande MX, Si
orig. use
0A1 0A1 1957-64 Wards (Motobecane) Riverside Mo-Ped
0A2 0A2 1965-70 Wards (Benelli) Riverside 150D, 250D
A27 A25 1978-79 Wheel King Road Runner, Cuyler (mono tube)
A15 A15 1998-09 Whizzer (with reserve tube removed) also A14
orig. use
A27 A25 1979-82 Yamaha QT50 Yamahopper
0A3 0A3 1977-79 Yankee Peddler (FMB), also A4 or A2

3. Gas Valve Parts

C. inline fuel filters, fittings, fuel hoses,
outer seal rings

D. inner seal disks

Find out more about the Gas Valves (Petcocks) »

4. Keihin Parts for 1982-87 NQ50, NB50, C70

April 8, 2021

== carb ID# S C O O T E R S a n d M O T O R C Y C L E S
8. PA 29C-D 1984-87 Honda NQ50, NB50 xxxxx 30 mph TS
14. PB 15A-A 1982-83 Honda C70 Passport xxxxx xxxxx OHC

Scooters

8. Keihin PA 29C-B on #GK8 ‘84-85 Honda NQ50 Spree (US)
8. Keihin PA 29C-D on #GK8 1985 Honda NQ50 Spree (US)
8. Keihin PA 29D-A on #GK8 ‘84-85 Honda NQ50 Spree
8. Keihin PA 29D-B on #GK8 1985 Honda NQ50 Spree
8. Keihin PA 29H-A on #GE8,GN2 1983-85 Honda NB50 Aero 50

1983 Honda NB50M Aero

1985 Honda NQ50 Spree

#0 16100-GK8-673 Keihin PA 29C-D

#0 16100-GN2-601 Keihin PA 04H-A

#0 16100-GN2-633 Keihin PA 046-A

#0 16100-GE8-013

Flange Mount: The flange mount holes on ’84-87 Spree carburetors are spaced 35mm, center-to-center. That is different from ’74-78 PC50 32mm, ’82-83 NC50-AA 36mm, ’77-83 NC50 38mm, ’79-on Z50 32mm, and ’76-78 Z50 38mm.

These were zippy 50cc two-stroke automatic scooters that maxed out at 30mph to meet many US state’s moped laws. They have electric start so there is 12 volt battery power to operate an automatic electric choke. They also have a gas gauge and an automatic vacuum petcock on the gas tank. You don’t have know very much to operate one. They had a CVT variator that continuously changes the belt drive pulley size ratio, for very quick acceleration.

Idle Mixture Screw: The idle mixture screw is an “air screw” that blocks off an air channel.

Main Jet: The main jet is a screw-in, recessed-type, M6-0.75 thread, size 68 (0.68mm).

Pilot Jet: The idle jet is not replaceable. It is inside the upper end of the brass tube, pressed into the main body, on the engine side of the main jet.

Float Seat: This carb does not have a replaceable float needle valve seat. The seat is part of the main body, and must be cleaned and polished with a spinning Q-tip.

Float: non-stirrup type white plastic 16013-147-004 see 6-4.0b, non-stirrup needle valve 16155-883-005 see 6-2.0b

Top Cap: M18 x 1 thread

The float bowl gasket in the illustration looks like the NC50-type, but it’s not. The actual gasket has an additional loop, for a vent and overflow.

quantity
o# ⇓⇓⇓⇓ Keihin PA (a)29C-B (b)29C-D (c)29D-A (d)29D-B
o# abcd price Honda part#x Spree carburetors
o0 1000 N/A ~~16100-GK8-671~~
o0 1000 N/A ~~16100-GK8-672~~ PA29C-B ’84-85 NQ50, NQ50-A (US)
o0 0100 N/A 16100-GK8-673 PA29C-D ’85 NQ50, NQ50-A (US)
o0 0010 N/A ~~16100-GK8-731~~
o0 0010 N/A ~~16100-GK8-732~~ PA29D-A ’84-85 NQ50-AA (US 25 mph)
o0 0001 N/A 16010-GK8-733 PA29D-B ’85 NQ50-AA (US 25 mph)
o0 1000 N/A ~~16100-GK8-871~~ PA000-0 ’86 NQ50-A
o0 1000 N/A ~~16100-GK8-881~~ PA000-0 ’86 NQ50-AA
o# abcd price Honda part#x Spree carburetor parts
o1 1111 $21 16010-GE8-305 gasket solo-set 1b 1c 1g 1v 1w
o1 1111 $21 16010-GK8-003 gasket solo-set 1b 1c 1g 1v 1w
o1 1111 $22 16010-GE8-315 gasket multi-set 1b 1c 1g 1v 1w 1x
1b 1111 $$8 00000-000-000 top rubber washer 13 x 16.5 x 1
1c 1111 $$2 00000-000-000 intake o-ring 2 x 20 (24 od)
1g 1111 $$2 00000-000-000 drain plug o-ring 1.5 x 4 (7 od)
1v 1111 $19 00000-000-000 float bowl gasket 2.5 x 1.5 with loop
1w1111 $2 00000-000-000 choke bystarter o-ring 1 x 16 (18 od)
1x 0000 N/A 00000-000-000 choke o-ring (some) 1 x 12 (14 od)
20 1100 N/A 99101-187-0680 jet 68 30mph versions
20 0011 N/A 99101-187-0650 jet 65 25mph version AA

o0 0000 N/A ~~16100-GE8-672~~
o0 0000 N/A 16100-GE8-673 carburetor PA040-0 ’83-84 NB50M (US)
o0 0000 N/A ~~16100-GE8-003~~ carburetor PA040-0 ’84 NB50M (DK)
o0 0000 N/A 16100-GE8-013 carburetor PA040-0 ’84 NB50M (DK)
o0 0000 N/A 16100-GE8-601 carburetor PA040-0 ’84 NB50M (UK)
o0 0000 N/A 16100-GE8-611 carburetor PA040-0 ’84 NB50M (DE)
o0 0000 N/A 16100-GE8-621 carburetor PA040-0 ’84 NB50M (FR)
o0 0000 N/A 16100-GE8-671 carburetor PA040-0 ’84 NB50M (CA)
o0 0000 N/A ~~16100-GN2-601~~ carburetor PA040-0 ’85 NB50M (UK)
o0 0000 N/A 16100-GN2-602 carburetor PA04H-A ’85 NB50M (UK)
o0 0000 N/A ~~16100-GN2-621~~ carburetor PA040-0 ’85 NB50M (FR)
o0 0000 N/A 16100-GN2-622 carburetor PA040-0 ’85 NB50M (FR)
o0 0000 N/A 16100-GN2-633 carburetor PA046-A ’85 NB50M (US)
o0 0000 N/A 16100-GN2-671 carburetor PA040-0 ’85 NB50M (CA and US)
o0 0000 N/A 16100-GN2-672 carburetor PA040-0 ’85 NB50M (US)
o0 0000 N/A 16100-GN2-871 carburetor PA040-0 ’86 NB50
o0 0000 N/A 16100-GN2-872 carburetor PA04P-A ’86 NB50 (US)
o0 0000 N/A 16100-GN2-762 carburetor PA04W-A ’87 NB50 (US)

Motorcycles

14. Keihin PB 15A-A on #GB4 1982-83 Honda C70 Passport (US)

Keihin PB15A-A

Flange Mount: 36? mm hole spacing

quantity
o# ⇓ Keihin PB (a)15A-A
o# a price Honda part#x description xxx specs
o0 1 N/A 16100-174-673 carburetor PB 15A-A 1980 C70 Passport (US)
o0 1 N/A 16100-174-772 carburetor PB 15A-A 1981 C70 Passport (US)
o0 1 N/A 16100-GB5-671 carburetor PB 15A-A ’82-83 C70 Passport (US)
o1 1 N/A 16010-GB4-013 gasket solo-set
o1 1 N/A 16010-141-305 gasket multi-set

5. Keihin Parts for 1968-09 Z50A, QA50, Z50R, XR50R, CRF50F

April 4, 2021

== carb ID# ========= M I N I C Y C L E S =========
9. PA Z502 1968-71 Honda Z50A Mini Trail xx 00 mph OHC
10. PA 655-A 1972-75 Honda Z50A Mini Trail xx oo mph OHC
10. PA 674-A 1970-75 Honda QA50 xxx oooo xx 00 mph OHV
11. PA 03A-A 1976-78 Honda Z50A Mini Trail xx oo mph OHC
11. PA 03C-A 1979-81 Honda Z50R
11. PA 03D-A 1982-85 Honda Z50R
11. PA 03F-B 1986-87 Honda Z50R
12. PA 03H-A 1988-91 Honda Z50R
12. PA 03H-B 1988-91 Honda Z50R
12. PA 03M-A 1992-99 Honda Z50R
12. PA 03N-A 1992-99 Honda Z50R
13. PA 42A-C 2000-03 Honda XR50R
13. PA 42A-C 2004-09 Honda CRF50F

9. Keihin Z50A on #045 1968-69 Honda Z50A Mini Trail up to Z50A-255950
9. Keihin Z502 on #045 1969-71 Honda Z50A Mini Trail after Z50A-255950

Keihin Z50A, Z502

Keihin Z50A, Z502 on 1968-71 Z50A

1968-71 Z50A carb kit

Flange Mount: 32mm hole spacing, 2 x 18 (22 od) o-ring

Main Jet: This carb has a screw-in main jet size 50.

Pilot Jet: It also has a screw-in idle (pilot) jet size 38.

Float Seat: It also has a screw-in float needle seat, replaceable.

Float: no-stirrup metal-tip needle valve, metal swinging float

The Z50A and Z502 carbs are the same except for the needle jet #12 and rubber cable pipe #10.

10. Keihin 655-A on #130 1972-75 Honda Z50A Mini Trail
12. Keihin 674-A on #114 1970-72 Honda QA50
12. Keihin ceto and #129 1973-75 Honda QA50

Keihin 655-A on 1972-75 Z50A

1974-75 Z50A carb kit, missing the drain plug o-ring and jet pad disk.
1970-73 Z50A carb kit also had a float seat and a float seat washer.

Flange Mount: 32mm hole spacing, no o-ring groove on carburetor. Instead the o-ring groove is on the intake manifold. Since the 2 x 18 (22 od) intake o-ring is not part of the carburetor, it is not in the Honda gasket set 16010-114-004, or the multi-app set 16010-114-305.

Main Jet: This carb has a “long” press-in jet, with a rubber pad disk under it.

Pilot Jet: The idle jet is not replaceable. It is inside the upper end of the brass tube, pressed into the main body, on the engine side of the main jet.

Float Seat early: The 1970-73 carburetor had a screw-in float needle seat, that was replaceable, like in the illustration.

Float Seat late: The 1974-75 carburetor did not have a replaceable float needle valve seat. The seat was part of the main body, and must be cleaned and polished with a spinning Q-tip.

Float: no-stirrup metal-tip needle valve, swinging float 16013-114-004

Top Cap: M18 x 1.0 thread

Drain screw: 1970-73 chamber set 16015-114-004 had a M4-0.7 thread drain screw with a 2 x 4 (8 od) o-ring. 1974-75 had a M6-0.75 thread drain screw with no o-ring. 1976-78 had a M6-1.0 thread drain screw with a 2 x 2.5 (6.5od) o-ring. 1979-later had a 1.5 x 4 (7od) drain screw o-ring.

Keihin 655-A, 674-A

quantity
o# ⇓⇓ (a) 655-A (b) 674-A
o# ab price Honda part#x description xxx specs
o0 10 N/A 16100-120-010 carburetor 655-A Ø?? ’72-75 Z50A
o0 01 N/A 16100-000-000 carburetor 674-A Ø?? ’70-75 QA50
o1 11 $24 16010-114-004 gasket solo set 1d 1e 1h 1n 1p 1r
o1 00 $24 16010-114-305 gasket multi set 1d 1e 1h 1n 1p 1r 1q
1d 11 0$2 16176-551-004 main jet o-ring 1 x 3 (5 od)
1e 11 $13 16197-063-004 jet support disk Ø7.5 x 1.8
1h 11 $$2 00000-000-000 intake o-ring 2 x 18 (22 od)
1n 11 0$3 16173-063-004 float bowl o-ring 1.5 x 40 (43 od)
1p 11 0$5 16171-044-004 top rubber washer 10 x 15 x 1
1r 11 0$5 16175-001-004 drain screw o-ring 2 x 4 (8od)

16010-114-004

1972 Z50A drain screw

11. Keihin (10 mm) PA 03A-A on #130 1976-78 Honda Z50A Mini Trail
12. Keihin (11 mm) PA 03B-A on #181 1979-79 Honda Z50R up to 5022291
12. Keihin (11 mm) PA 03C-A on #181 1979-81 Honda Z50R after 5022291
12. Keihin (11 mm) PA 03D-A on #181 1982-85 Honda Z50R
12. Keihin (11 mm) PA 03F-B on #181 1986-87 Honda Z50R

In 1979 the model name changed from Z50A to Z50R, and the name Mini Trail was dropped.

#0 16100-130-642
Keihin PA 03A-A
for 1976-78 Z50A
from cmsnl.com

#0 16100-165-004
Keihin PA 03B-A
for 1979 Z50R

#0 16100-165-014
Keihin PA 03C-A
for 1979-81 Z50R
from cmsnl.com

#0 16100-181-751
Keihin PA 03D-A
for 1982-85 Z50R

#1 16010-181-832
Keihin PA 03F-B
for ’86-87 Z50R
from cmsnl.com

1976-78 Z50A carb kit
D348 thick needle, #58 push-in jet.
The drain screw and jet support pad are missing.

1979-81 Z50R carb kit
D117 thin needle, #58 screw-in jet. Left to right: drain screw, needle jet (emulsion tube), idle air screw, idle speed screw, float needle

Flange Mount: 38 mm hole spacing 1976-78. 32 mm hole spacing 1979-87.

Pilot Jet: The idle jet is not replaceable. It is inside the upper end of the brass tube, pressed into the main body, on the engine side of the main jet.

Main Jet: For some reason in 1979 Honda wanted to make their jets tamper-proof. It’s funny that they went from one extreme to the other, from jets that fall out too easy, to jets that never come out. Both the NC50 and the Z50 changed to “fixed” jets (not replaceable) in late 1978 and 1979. After 1981 the jet was a screw-in, thankfully, like in the illustration

Float Seat: This carb does not have a replaceable float needle valve seat. The seat is part of the main body, and must be cleaned and polished with a spinning Q-tip.

Carb Kit: Beware of low-cost carburetor kits. In the kit at the right several things are wrong or made badly. 1) it is missing the press-in jet pad disk, 2) the jet o-ring was too big to allow the jet to press in. You can see it seems big in the photo. It was size 1.5 x 4 instead of 1 x 3, 3) the float needle was longer than stock, and the wire stirrup was bent badly in two ways. The throttle (jet) needle was D117 thin instead of D348 thick.

Float: In 1979 the float and float needle changed, from stirrup-type needle valve with black foam float, to no-stirrup needle valve 16155-883-005 with white plastic float 16013-147-004. Like before, the float needle has a rubber cone upper tip and a spring-loaded lower tip.

Float Bowl: The 1979-later float bowl no longer has a press-in jet support pad disk 7.5 x 1.8mm.

16010-081-004

#1 16010-143-305

#1 16010-081-014

#1 16010-165-621

#1 16010-181-305

PA 03A, 03B, 03C, 03D, 03F

quantity
o# ⇓⇓⇓⇓   PA(a)03A-A (b)03B-A (c)03C-A (d)03D-A (e)03F-B
o# abcde price Honda part#x description xxx specs
o0 1o0oo N/A ~~16100-130-641~~ use 16100-130-642
o0 1o0o0 N/A 16100-130-642 carburetor PA 03A-A Ø10 x 38 ’76-78 Z50A
o0 o1000 N/A 16100-165-004 carburetor PA 03B-A Ø11 x 32 ’79-79 Z50R
o0 o0100 N/A 16100-165-014 carburetor PA 03C-A Ø11 x 32 ’79-81 Z50R
o0 oo010 N/A 16100-181-751 carburetor PA 03D-A Ø11 x 32 ’82-85 Z50R
o0 00001 N/A ~~16100-181-830~~ ~~16100-181-831~~ use 16100-181-832
o0 00001  N/A 16100-181-832 carburetor PA 03F-B Ø11 x 32 ’86-87 Z50R
o1 1o000 $28 16010-081-004 gasket solo-set 1a o d e f o h i
o1 10000 $28 16010-143-305 gasket multi-set 1a c d e f o h i
o1 01100 $22 16010-081-014 gasket solo-set 1a o o o f g h
o1 00011 $23 16010-165-621 gasket solo-set oo o o o f g h o l
o1 01111 $23 16010-181-305 gasket multi-set 1a o o o f g h o l
1a 1o000 $$3 00000-000-000 top rubber washer 10 x 18 x 1
1d 1o0o0 0$2 16176-551-004 main jet o-ring 1 x 3 (5 od)
1e 10000 $13 16197-063-004 jet support pad disk Ø7.5 x 1.8
1f 11111 $18 00000-000-000 float bowl gasket Ø1.5 NC50-type
1g o1111 $$2 00000-000-000 drain screw o-ring 1.5 x 4 (7 od)
1h 11011 $$2 00000-000-000 intake o-ring 2 x 18 (22 od)
1i 10000 0$2 16175-260-004 drain screw o-ring 2 x 2.5 (6.5 od)
1l 01111 0$4 16110-181-831 top rubber washer 13 x 19 x 1
02 10000 N/A 16012-130-640 needle set 03AA
02 010o0 N/A ~~16012-165-014~~ needle set 03BA use 16012-181-831
02 00111 N/A 16012-181-831 needle set 03CA, 03DA, 03FB
03 1o000 N/A ~~16013-099-691~~ use 16013-143-620
o3 1o000 $46 16013-143-620 float set 3a oo 3c 3d black stirrup
o3 o1111 $28 16013-147-004 float set oo 3b 3c 3d white regular
3a 1o000 N/A 00000-000-000 float bare, solid black foam stirrup
3b o1111 $21 00000-000-000 float bare hollow white plastic regular
3c 11111 $$4 00000-000-000 hinge pin substitute Ø2 x 18.5
3d 11111 $$3 0-93600-04006 hinge screw M4x6 sunk phillips
o4 11100 N/A 16014-130-640 top set with pipe 4a 1a M18-1.0
o4 00011 N/A 16014-GB1-912 top set with pipe 4a 1l M20-1.0
05 1o000 N/A 16015-130-640 chamber set 5a 1e 1f 5b 1g
05 o1110 N/A 16015-099-691 chamber set 5a oo 1f 5b 1g
05 o???1 N/A ~~16015-130-641~~ use 16015-130-641
05 o???1 N/A 16015-165-621 chamber set 5a oo 1f 5b 1g
6a ????1 N/A ~~16016-165-621~~ use 16016-165-505
6a ????1 N/A 16016-165-505 idle air screw set
6b ????1 N/A 16208-GC8-004 idle speed screw set
07 ????? N/A slide set
09 ????? N/A rubber cable pipe cover
10 1o0oo N/A ~~16011-143-620~~ use 16011-881-741
10 1o0oo $21 16011-881-741 float needle valve  stirrup
10 o1111 $22 16155-883-005 float needle valve regular
11 22222 0$1 93892-04012-08 screw & washer M4x12 pan phillips
14 10000 $16 99201-081-0580 main jet push-in #58 0.0228″
14 01100 N/A fixed needle jet and main jet pressed in 0.0228″
14 00011 0$7 99101-187-0580 main jet screw-in #58 0.0228″
18 11111 N/A (not sold separately) idle jet press-in tube 0.015″ pinhole

12. Keihin PA 03H-A on #GW8 1988-88 Honda Z50R up to JS900485
15. Keihin PA 03H-B on #GW8 1988-91 Honda Z50R after JS900485
15. Keihin PA 03M-A on #GW8 1992-93 Honda Z50R
15. Keihin PA 03N-A on #GW8 1994-99 Honda Z50R

#0 16100-GW8-682 Keihin PA 03M-A

#0 16100-GW8-305 Keihin PA 03~~N-A~~ from cmsnl.com

Flange Mount: 32mm hole spacing

Main Jet: screw-in #58, M6-0.75

Float: no-stirrup type white plastic 16013-147-004, needle valve 16155-883-005

Top Cap: M20-1.0 thread

Idle Mixture Screw: For the entire Z50A and Z50R year range 1968 to 1999, the idle mixture screw was an air type, not a fuel type. An idle air screw blocks an air tunnel, so tighter is less air (richer). An idle fuel screw blocks off a fuel tunnel. So tighter is less fuel (leaner).

1992-98 Z59R carb kit

#1 16010-181-831
for PA 03H 03M 03N

#1 16010-181-305
for PA 03H 03M 03N

#5 16016-GW8-672
This idle air screw looks
like an idle fuel screw.

Keihin PA 03H-A, PA 03H-B, PA 03M-A, PA 03N-A

quantity
o# ⇓⇓⇓⇓ Keihin PA (a)03H-A (b)03H-B (c)03M-A (d)03N-A
o# abcd price Honda part#x description xxx specs
o0 1000  N/A ~~16100-GW8-671~~ 16100-GW8-672 carburetor PA 03H-A 1988 Z50R up to JS900485
o0 0100  N/A 00000-000-000 16100-GW8-673 carburetor PA 03H-B ’88-91 Z50R mix screw changed
o0 0010  N/A ~~-680~~ ~~-681~~ 000 16100-GW8-682 carburetor PA 03M-A ’92-93 Z50R
o0 0001 N/A ~~-780~~ ~~-791~~ 000 16100-GW8-792 carburetor PA 03N-A ’94-99 Z50R
o0 1111 N/A 00000-000-000 16100-GW8-305 multi-carb PA 03~~N-A~~ replacement
o1 1111 $23 16010-181-831 gasket solo-set o0 1f 1g 1h 1l
o1 1111 $23 16010-181-305 gasket multi-set 1a 1f 1g 1h 1l
1f 1111 $18 00000-000-000 float bowl gasket Ø1.5 NC50-type
1g 1111 $$2 00000-000-000 drain plug o-ring 1.5 x 4 (7 od)
1h 1111 $$2 00000-000-000 intake o-ring 2 x 18 (22 od)
1l 1111 0$4 16110-181-831  top rubber washer 13 x 19 x 1
02 needle set
03 float set
04 chamber set
05 idle air screw set
06 slide set
07 idle speed screw set
09 top set
10 float needle
11 float bowl screw
12 drain hose
13 drain hose clamp
14 main jet

13. Keihin PA 42A-C on #GEL 2000-03 Honda XR50R
16. Keihin PA 42A-A on #GEL 2000-03 Honda XR50R
16. Keihin PA 42A-A on #GEL 2004-09 Honda CRF50F

In 2000 the Z50R was replaced by the XR50R. The carburetor remained mostly the same.

Links to Images:
2000 Honda XR50R carburetor PA42A-C
2008 Honda CRF50F carburetor The gasket for this was in use for over 34 years!

This carburetor looks the same as the previous Z50R ones, except the flange is thicker and has square corners, not rounded.

Flange Mount: 32mm hole spacing, thicker with square corners

Chinese re-makes of this carburetor are common on the internet, at incredibly low prices. Read several reviews before buying one. Try to re-use the original Keihin.

In 2004 the XR50R was replaced by the CRF50F. The carburetor remained mostly the same.

Service: Here is a good article about how to remove and clean the non-replaceable idle (pilot) jet.

https://thumpertalk.com/forums/topic/1047667-clogged-pilot-jet-on-a-crf50-success/

The CRF50F idle jet in that article did not crush when gripped lightly with a vise grip pliers. But some pressed-in idle jets have thin walls, or have a tighter fit that needs heavy clamping. Those require a close-fitting drill bit or solid wire, be placed in the hole first, to prevent crushing the tube with the vise grips. It’s a good idea to do that always.

6. Keihin Carburetor Parts by Type

April 3, 2021

============== K E I H I N P A R T S ===========
15. Float needles
16. Float bowls
17. Gaskets and O-rings
18. Jets

15. Float needles (valves)

Baby valves: These are the float needle valves for the smallest “baby” Keihin carburetors. Most other float needles are bigger than these, but look the same in photos.

16123-063-004 float needle valve $13 all metal type
On road models: 1969-70 Honda PC50, 1969-70 Honda PS50, 1970-72 Honda PC50K1, 1971-73 PF50 Amigo standard (FR DK NE), 1971-73 PF50 Amigo Graduate (UK), 1970-71 PS50K1, PS50K1 (NE), others

16011-881-741 float needle valve $21 stirrup type, 3-sided for 4.00 hole
supersedes ~~16011-143-62016011-147-004~~
On road models: 1977-79 Honda NC50 Express (with PA08B-A carb), 1978-79 PA50I and PA50II Hobbit, 1976-78 Z50A Mini Trail Off road: 1976-78 Honda Z50A, 1977-79 XL75, 2004-07 CR80F, 1976-78 XR75, 1979-84 XR80, 1985-03 XR80R, 1977 CT125, 1976 TL125

16155-883-005 float needle valve $22 regular type, 3-sided for 4.00 hole
On road models: 1973-77 Honda PC50K1, 1973-78 Honda PF50 Amigo/Novio, 1978-83 Indian AMI-50, 1979-83 Honda NC50 Express (with PA08B-B carb), 1980-83 PA50II Hobbit, 1979-81 NA50 Express II, 1981-82 NX50 Express SR, 1982-83 NU50 Urban Express, 1980-83 C70 Passport, 1978-79 CT90 Trail 90, 1986 CT110 Trail 110, 1982 MB5, 1990 NS50, 1984-85 NQ50 Spree, 1988-90 SA50 Elite 50, 1985-91 CH80 Elite 80 Off road: 1979-99 Honda Z50R, 1988 ZB50, 2000-03 XR50R, 2004-12+ CRF50F, 2004-09, CRF70F, 1978-82 CT70, 1997-03 XR70R, 1978-79 Honda CT90, 1980-84 CT110

Valve seats: The seat is the hole that the needle tip seals against. These “baby” Keihin PA series carbs have non-replaceable valve seats. Most motorcycle carburetors have replaceable float valve seats that screw in or push in. The seat is normally replaced with the needle. With these the seat must be cleaned, polished and inspected. It’s a tiny round hole at the end of a dark small round tunnel. It’s hard to see. It must be perfectly circular with no nicks or scratches on the edge of the hole, where it seals against the rubber cone tip of the needle. The walls of the tunnel must be clean, smooth and shiny or the float might stick open a little and cause an overflow leak.

Beware of low cost float needles (valves). These have to be made precisely the same as originals in order to function properly. In the photo, the left one is a 16011-991-741 generic low-cost replica, made incorrectly. The stirrup wire is bent and the needle is longer. The right and middle are 16011-991-741 Honda originals (or KL-made replicas) for comparison, made correctly.

Chamber families 165, 147A, 191, GK8

16. “baby” Keihin float bowls

Here the chamber sets from above are all listed together, along with the carbs and bikes they go on. A chamber set includes the float bowl, float gasket, drain screw, and drain screw o-ring. As a courtesy, here are the links to CMS in Netherlands where you can view their image and see their price and availability.

Families: A chamber set family is one or more chamber sets that can interchange.

Jet pad: Before about 1980 these carburetors had push-in main jets. The push-in main jet was supported by a pill size rubber pad. The jet pad was held by a circular wall in the bottom of the float bowl. You can see that in the image on the right. The second bowl is for a jet pad, but the first bowl is not.

Choke jet: Carbs with fuel enrichment type chokes have a jet in one corner of the float bowl (2nd, 3rd, and 4th in the image). Carbs with air valve choke plates do not have a choke jet (first in the image).

Float Bowls (chambers) with no choke jet ================= chamber gasket

16015-064-004 064 family
cmsnl.com roundish shape, shallow for jet pad, no choke jet
on carbs C4A C5A C5B F4A F5A lever-plate choke
on bikes 69-70 PC50/PS50, 70-73 PC50K1/PS50K1, 71-73 PF50

16015-114-004 114 family
cmsnl.com roundish shape, deep for jet pad, no choke jet
on carbs 655A 674A lever-plate choke
on bikes 72-75 Z50, 70-75 QA50

16015-081-004 081 family
cmsnl.com NC50-shape, shallow for jet pad, no choke jet
on carbs PA00A PA01A lever-plate choke
on bikes 73-77 PF50R, 73-78 PC50K1

16015-130-640
cmsnl.com NC50-shape, shallow, for jet pad, no choke jet
on carbs PA03AA lever-plate choke
on bikes 76-78 Z50A, 79-81 Z50R and other Z50’s

16015-099-691 165 family
cmsnl.com NC50-shape, shallow, for no jet pad, no choke jet
on carbs PAM0A PA03HA PA03HB PA03MA others lever-plate choke
on bikes 78-83 Indian, 88-99 Z50R, 04-05 CRF50F many others

~~16015-130-641~~ ⇒ 16015-165-621
cmsnl.com NC50-shape, shallow, for no jet pad, no choke jet
on carbs PA03CA PA03DA lever-plate choke
on bikes 80-85 Z50R

same

~~16015-165-920~~ ⇒ 16015-165-621
cmsnl.com NC50-shape, shallow, no jet pad, no choke jet
on carbs
on bikes

~~16015-165-621~~ ⇒ 16015-165-B10
cmsnl.com NC50-shape, shallow, for no jet pad, no choke jet
on carbs PA03FB lever-plate choke
on bikes 86-87 Z50R

same

16015-165-B10
cmsnl.com NC50-shape, shallow, for no jet pad, no choke jet
on carbs PA03?? lever-plate choke
on bikes 93-96 Z50J (Japan model)

Float Bowls (chambers) with choke jet ================= chamber gasket

16015-147-004 147A family
cmsnl.com NC50-shape, shallow, for jet pad, with choke jet
on carbs PA08BA black float, cable-enrich choke
on bikes 77-78 NC50

16015-147-014 147B family
cmsnl.com NC50-shape, shallow, for no jet pad, with choke jet
on carbs PA08BB 08EA 08EB 08DA white float cable-enrich choke
on bikes 78-80 NC50, 79-80 NA50

same

16015-187-043 use 16015-191-034 191 family
cmsnl.com NC50-shape, deep, for no jet pad, with choke jet
on carbs PA13EA white float vacuum-enrich choke
on bikes 82-83 NU50, NU50M

16015-187-671 use 16015-191-034
cmsnl.com NC50-shape, deep, for no jet pad, with choke jet
on carbs PA13BA white float vacuum-enrich choke
on bikes 81-82 NX50

~~16015-191-014~~ ⇒ 16015-191-024
cmsnl.com NC50-shape, deep, for no jet pad, with choke jet
on carbs PA15AA PA16AA white float vacuum-enrich choke
on bikes 81 NC50, 81 NA50

same

~~16015-191-024~~ ⇒ 16015-191-034
cmsnl.com NC50-shape, deep, for no jet pad, with choke jet
on carbs PA15AA PA16AA white float vacuum-enrich choke
on bikes 81 NC50, 81 NA50

16015-191-034 available soon
cmsnl.com NC50-shape, deep, for no jet pad, with choke jet
on carbs PA15AA PA16AA white float vacuum-enrich choke
on bikes 81 NC50, 81 NA50

16015-GA6-671 use 16015-191-034
treatland.tv NC50-shape, deep, for no jet pad, with choke jet
on carbs PA13EA white float vacuum-enrich choke
on bikes 82-83 NC50

16015-GK8-671 GK8 family
cmsnl.com NC50 with outer loop, very deep, choke jet
on carbs PA29CD PA29HA others electric-enrich choke
on bikes 84-86 NQ50, 83-85 NM50

17. Gasket Multi-App Sets (for several carburetors)

There are 100’s of vintage Honda carburetors. Many share the same gaskets, but have maybe one or two things different. To reduce the number of different gasket sets, Honda combines several sets into one multi-set. In a multi set there are extra “optional” gaskets, that may or may not be needed. These are in separate packages labeled A or B. There is a sheet of paper with a table of replacement gasket set part numbers, the specific part numbers they replace, and a number, usually 1 or 0, in the A and B columns, telling how many of each “optional” gaskets are required.

16010-114-305

16010-114-305 $20
fits 1972-75 Honda Z50A (minus 2 x 18 o-ring)
fits 1970-75 Honda QA50
1p top rubber washer 10 x 15 x 1
1q (A) drain screw washer 3 x 6 x 0.5
1d main jet o-ring 1 x 3 (5 od)
1e jet support disk Ø7.5 x 1.8?
1n float bowl gasket 1.5 x 40 (43 od)
1r drain plug o-ring 2 x 4 (8 od)

16010-143-305

16010-143-305 $28
fits 1976-78 Honda Z50A Mini Trail, 1979-81 Z50R
fits 1977 NC50 Express and some 1978 (except for the drain plug o-ring)
fits 1970-77 PC50K1 and 1978-80 Indian AMI50 (except drain plug o-ring)
1a top rubber washer 10 x 18 x 1
1h (A) intake o-ring 2 x 18 (22 od)
1c (B) intake o-ring 2 x 20 (24 od)
1d main jet o-ring 1 x 3 (5 od)
1e jet support disk Ø7.5 x 1.8
1f float bowl gasket Ø1.5 NC50 type
1i drain plug o-ring 2 x 2.5 (6.5 od)

16010-147-505

16010-147-505 $24
fits 1979 NC50 and some 1978
fits 1979-80 NA50 and NC50
fits
1b top rubber washer 13 x 16.5 x 1
1c intake o-ring 2 x 20 (24 od)
1d (A) idle fuel screw o-ring 1 x 3 (5 od)
1g (A) drain plug o-ring 1.5 x 4 (7 od)
1f float bowl gasket Ø1.5 NC50 type
1i (B) drain plug o-ring 2 x 2.5 (6.5 od)

16010-156-305

16010-156-305 $15
fits 1978-83 Honda PA50
1c intake o-ring 2 x 20 (24 od)
1w intake o-ring 2.5 x 24 (29 od)
1g drain plug o-ring 1.5 x 4 (7 od)
1j float bowl gasket 2 x 50 (54 od)

16010-181-305

16010-181-305 $23
fits 1979-86 Z50R, 2000-03 XR50R, 2004-11+ CRF50F
1a top rubber washer 10 x 18 x 1
1h intake o-ring 2 x 18 (22 od)
1l top rubber washer 13 x 19 x 1
1g drain plug o-ring 1.5 x 4 (7 od)
1f float bowl gasket Ø1.5 NC50 type

16010-GE8-315

16010-GE8-315
fits 84 NB50M, 82-85 NJ50M, 84-86 NQ50, NQ50M
1b top rubber washer 13 x 16.5 x 1
1c intake o-ring 2 x 20 (24 od)
1y (A) o-ring 1 x 12.5 (14.5 od)
1z (B) o-ring 1 x 16 (18od)
1g drain plug o-ring 1.5 x 4 (7 od)
1k float bowl gasket 2.5 tall x 1.5 wide NQ50 type

16010-GF8-305

16010-GF8-305 $25
fits 1981-82 NX50, 1982-83 NU50
1b top rubber washer 13 x 16.5 x 1
1h intake o-ring 2 x 18 (22 od)
1d (A) idle fuel screw o-ring 1 x 3 (5 od)
1t (B) o-ring 1.5 x 8.5 (11.5 od)
1u (B) nylon washer 6.2 x 11 x 0.8
1g drain plug o-ring 1.5 x 4 (7 od)
1k float bowl gasket 2.5 tall x 1.5 wide NQ50 type

1a rubber washer 10 x 18 x 1
1b rubber washer 13 x 16.5 x 1
1c o-ring 2.0 x 20 (24 od)
1d o-ring 1.0 x 3 (5 od)
1e jet disk Ø7.5 x 1.8?
1f float gasket Ø1.5 NC50 type
1g o-ring 1.5 x 4 (7 od)
1h o-ring 2.0 x 18 (22 od)
1i o-ring 2.0 x 2.5 (6.5 od)
1j o-ring 2.0 x 50 (54 od)
1k float gasket 2.5 tall x 1.5 wide NQ50 type
1l rubber washer 13 x 19 x 1
1n o-ring 1.5 x 40 (43 od)
1p rubber washer 10 x 15 x 1
1q fiber washer 3 x 6 x 0.5
1r o-ring 2.0 x 4 (8 od)
1s
1t o-ring 1.5 x 8.5 (11.5 od)
1u nylon washer 6.2 x 11 x 0.8
1v float bowl gasket 2.5 x 1.5 with loop
1w o-ring 2.5 x 24 (29 od)
1x o-ring 1.0 x 12 (14 od)
1y o-ring 1.0 x 12.5 (14.5 od)
1z o-ring 1.0 x 16 (18 od)

18. Jets

99201-081-0700

∅ 5 P U S H – I N J E T S ∅5.0 x 9.5 with o-ring 1 x 3 (5 od)
===========================================
N/A 99201.081.0500 jet push-in 50
N/A 99201.081.0520 jet push-in 52
N/A 99201.081.0550 jet push-in 55 C4A C4B F4A C5A
$16 99201.081.0580 jet push-in 58 PA 03A-A
N/A 99201.081.0600 jet push-in 60
N/A 99201.081.0620 jet push-in 62 C5B F5A
$16 99201.081.0650 jet push-in 65 PA 01A
N/A 99201.081.0680 jet push-in 68
$16 99201.081.0700 jet push-in 70 PA 00A
N/A 99201.081.0780 jet push-in 78 PA 08B-A
$23 substitute jet, #70 drilled to 78 PA 08B-A

99201-122-0750

∅ 5 P U S H – I N J E T S ∅5.0 x 9.5 with o-ring 1 x 3 (5 od)
===========================================
N/A 99201.122.0650 jet push-in 65 PA 06A
N/A 99201.122.0700 jet push-in 70
N/A 99201.122.0750 jet push-in 75 006A, PA 07A

99101-187-0700

M 6 S C R E W – I N J E T S M6-0.75 thread
===========================================
0$7 99101-187-0580 jet #58 PA03DA PA03FB 82-87 Z50R
N/A 99101-187-0600 jet #60
N/A 99101-187-0640 jet #64
0$7 99101-187-0680 jet #68 PA29CD PA29HA 84-87 NQ50
$$7 99101-187-0700 jet #70 PAMOA PA25A ? 78-80 Indian, 82-83 NC50I
0$7 99101-187-0750 jet #75 PA15A 16A 13BB 81-83 NC50, 81 NA50
0$7 99101-187-0760 jet #76
0$7 99101-187-0780 jet #78 PA13BA 81-82 NX50
0$7 99101-187-0800 jet #80
N/A 99101-187-0820 jet #82
0$7 99101-187-0850 jet #85 PA13EA 82-83 NU50

99101-124-0700

M 7 S C R E W – I N J E T S M7-0.75 thread
===========================================
$7.00 99101-124-0600 main jet 60 BB21A
$7.00 99101-124-0780 main jet 78 BB20A

19. Where else to get Keihin parts

Consolidated Motor Spares B.V. (CMS): This is an excellent online store from the bike-loving nation of Netherlands that has “every” Honda part. They have parts schematic illustrations for every Honda model worldwide, and photos of every part on every Honda, and not just motorcycles. And not just Honda, but also Kawasaki, Suzuki, and Yamaha. Much of the information of the Honda “Baby” Keihin carburetors came from CMS. https://www.cmsnl.com/

2. Keihin Parts for 1973-83 PC50K1, AMI-50, PA50, MR50, PM50, PF50M

April 3, 2021

== carb ID# ============ M O P E D S ===========
3. PA 00A-A 1973-77 Honda PC50K1, PF50R ooo 50 kmh OHV
3. PA 01A-A 1973-77 Honda PC50K1, PF50R ooo 40 kmh OHV
3. PA M0A-A 1978-83 Indian AMI50 4-Stroke xx 30 mph OHV
4. BB 21A-B 1978-78 Honda PA50-I Hobbit xxx 20 mph TS
4. BB 21A-F 1979-79 Honda PA50-I Hobbit xxx 20 mph TS
4. BB 20A-C 1978-78 Honda PA50-II Hobbit xx 30 mph TS
4. BB 20A-F 1979-83 Honda PA50-II Hobbit xx 30 mph TS
5. P 006A-A 1974-75 Honda MR50 Elsinore xxx 40 kmh OHC
5. PA 06A-A 1973-78 Honda PM50, PF50M xxxx 40 kmh TS
5. PA 07A-A 1975-78 Honda PF50M xxxxxxxxx 50 kmh TS

3. Keihin
size carb years model code models00xx speed version
0∅9 PA 01A 1973-77 081 Honda PC50K1 00xxxxxx 40 km/h
0∅9 PA 01A 1973-78 099 Honda PF50 Amigo/Novio 40 km/h
∅10 PA 00A 1973-77 081 Honda PC50K1 00xxxxxx 50 km/h
∅10 PA 00A 1973-78 099 Honda PF50 Amigo/Novio 50 km/h
∅10 PA M0A 1978-81 000 Indian AMI-50 (US) xxxx 30 mph

1. ’73 Honda PC50K1, 2. ’80 Indian AMI-50 (US), 3. ’73-78 Honda PF50 Amigo line

1. ’75 Honda PC50K1, 2. ’80 Indian AMI-50 (US), 3. Keihin PA-00A carb, 4. Missing the jet pad #1e.

1. #0 16100-081-024 Keihin PA-00A carb, 2. #0 Keihin PA-M0A carb

Late PC50: In 1973 the PC50 carburetor changed from “donut” float to a swinging float, and a NC50-type float bowl and gasket. The 1973-77 PC50K1 and 1973-78 PF50 engine and carb are the same as the Taiwan remake engine and Keihin carburetor used on the 1978-83 Indian moped. So the carburetor parts are the same also, with some exceptions.

PA 00A (16100-081-024) and PA 01A (16100-099-693) have the same parts. The push-in jet size, venturi size and intake flange o-ring are the only difference.

PA M0A (E210-20-50) has the same parts as PA 00A and PA 01A, except for 1) a screw-in jet instead of push-in, 2) no jet pad, 3) no jet pad holder in float bowl, 4) a white regular type float instead of a black stirrup type.

Flange Mount: 32 mm hole spacing, 2 x 18 (22 od) o-ring 00A, 01A.

Indian AMI50: The Indian AMI50 Chief four stroke moped engine, OHV with pushrods and internal pedals, made from 1978-1984, is a Taiwan-made copy of a Honda PC50K1 or PF50 engine, OHV with pushrods and internal pedals, made from 1973-1978. The Indian had three different carburetors, Tillotson (some 1978), Keihin (some 1978, most 1979-80), Mikuni (some 1980, all 1981-84). Only the Keihin parts are listed here.

1. left, #0 Keihin PA-M0A carb, 2. right, #0 generic PA-M0A carb

1. #1 16010-081-004 carburetor gasket set for PA 00A and 01A
2. #1 16010-143-305 carburetor multi-set for PA 00A, 01A, 03A
3. #1 16010-081-014 carburetor gasket set for PA M0A
4. #1 16010-181-305 carburetor multi-set for PA M0A, 03C, 03D, 03E, 03F

quantity
o# ⇓⇓⇓ Keihin (a)PA-00A (b)PA-01A  (c)PA-M0A
o# abc price Indian part#  Honda part# description specs
00 100 N/A 0000-00-00 16100-081-024 carburetor PA 00A Ø10 E10
00 010 N/A 0000-00-00 16100-099-693 carburetor PA 01A Ø9 E10
00 001 N/A E210-00-50 16100-000-000 carburetor PA M0A Ø10
00 111 $75 E000-00-00 16100-000-000 carb generic new Ø10, jet 70 screw-in
00 111 $50 E000-00-00 16100-000-000 carb generic new no top, slide, needle
o1 110 $28 0000-00-00 ~~16010-081-004~~ gasket solo-set 1a o d e f g h
o1 110 $28 0000-00-00 16010-143-305 gasket multi-set 1a c d e f o h i
o1 oo1 $22 E231-gasks ~~16010-081-014~~ gasket solo-set   1a o o o f g h
o1 001 $23 E231-gasm 16010-181-305 gasket multi-set 1a o o o f g h i l
1a 111 $$3 E231-####00000-000-000 top rubber washer 10 x 18 x 1
1c 000 $$2 E231-####00000-000-000 intake o-ring 2 x 20 (24 od)
1d 11o 0$2 0000-00-00 16176-551-004 main jet o-ring 1 x 3 (5 od)
1e 11o $13 E231-####16197-063-004 jet pad disk Ø7.5 x 1.8
1f 111 $18 E231-02-00 00000-000-000 float bowl gasket Ø1.5 NC50-type
1g oo1 $$2 E231-11-00 00000-000-000 drain screw o-ring 1.5 x 4 (7 od)
1h 11o $$2 0000-00-00 00000-000-000 intake o-ring 2 x 18 (22 od)
1i 110 0$2 0000-00-00 16175-260-004 drain screw o-ring 2 x 2.5 (6.5 od)
02 110 $21 0000-00-00 16011-881-741 float needle valve  stirrup type
02 oo1 $22 E231-13-00 16155-883-005 float needle non-stirrup type
03 111 N/A E231-####16012-081-014 needle set 3a 3b 3c 3d
3a 111 $10 E231-09-00 00000-000-000 jet needle D348 thick Ø2 x 33
3b 111 0$2 E231-10-00 16157-044-004 needle e-clip substitute 1.5mm
3c 111 0$5 E231-08-00 16156-044-004 w-spring clip
3d 111 N/A E231-####16133-081-004 needle jet ∅3.95 ∅5 ∅3.9 ∅5 x 27
3d ooo 0$6 0000-00-00 ooooo-000 03A needle jet ∅3.95 ∅5 ∅3.9 ∅5 x 27
3d ooo 0$6 0000-00-00 ooooo-000 03B needle jet ∅3.95 ∅5 ∅3.9 ∅5 x 27
o4 110 N/A E231-####16013-099-691 float set black 4c 4d 4e PA 00A, 01A
4a 001 $28 E231-####16013-147-004 float set white 4b 4d 4e PA M0A
4b 001 $21 E231-06-00 00000-000-000 float bare white non-stirrup
4c 110 N/A E231-06-00 00000-000-000 float bare black stirrup
4d 111 $$4 E231-15-00 00000-000-000 hinge pin substitute Ø2 x 18.5
4e 111 $$3 E231-16-00 0-93600-04006 hinge pin screw M4 x 6 sunk
05 111 $30 E231-01-00 16014-081-004 top set 5a 5b 1a
5a 111 $23 E231-03-00 00000-000-000 substitute cap brass M20-1.0
5b 111 0$3 E231-####00000-000-000 cable adjuster male M6-0.75
06 11o N/A E231-01-00 16015-081-004 chamber set 6a 6b 1f 1i
6a 11o N/A 0000-00-00 16015-165-B10 float bowl bare for push-in jet
06 oo1 $67 E231-####16015-099-601 chamber set 6a 6c 1f 1g
6a oo1 $46 E231-01-00 16015-165-B10 float bowl bare for screw-in jet
6b 11o N/A 0000-00-00 00000-000-000 bowl drain screw M4-0.70
6c oo1 $16 E231-23-00 00000-000-000 bowl drain screw M6-1.00
07 111 $15 E231-####16016-143-620 adjustment screw set 7a 7b 7c 7d
7a 111 $$9 E231-19-00 00000-000-000 idle air mix screw M6-0.75 special
7b 111 $$4 E231-21-00 00000-000-000 idle speed screw M4-0.70 special
7c 111 $$7 E231-20-00 00000-000-000 idle air screw spring Ø4.9 x 10
7d 111 $$2 E231-22-00 00000-000-000 idle speed screw spring Ø5.6 x 10
08 1o1 $34 E231-####~~16022-081-004~~ valve set 8a 8b Ø13 PA 00A
08 1o1 $00 E231-####16022-HB2-003 new #
8a 1o1 $22 E231-07-00 00000-000-000 throttle slide Ø13 #15A PA 00A
8b 1o1 $12 E231-17-00 00000-000-000 throttle spring Ø10 x 42 PA 00A
08 o1o N/A 0000-00-00 ~~16022-143-620~~ valve set 8a 8b Ø12 PA 01A
08 o10 $00 0000-00-00 16022-191-004 new #
11 111 0$2 E231-04-00 16118-086-004 rubber boot substitute Dellorto
12 222 0$1 E231-12-00 93500 – 04012 bowl screw M4 x 12 pan phillips
13 222 .25 E231-#### 95002-02070 bowl screw lock washer
14 111 N/A E231-#### 95001-35150 drain hose
15 111 N/A E231-####0-95002-02070 drain hose clamp
16 oo1 $$7 E231-18-00 ~~99101-187-070~~ main jet #70 M6-0.75 screw-in
16 oo1 N/A E231-18-00 99201-187-0700 new #
16 11o $16 0000-00-00 ~~99201-081-070~~ main jet #70 0.0275″ push-in
16 11o N/A 0000-00-00 99201-081-0700 new #
17 oo1 N/A E231-01-00 00000-000-000 carb body bare
18 oo1 N/A E231-####00000-000-000 idle jet press-in tube 0.38 mm=0.015″

Indian PA MOA carb disassembled

Choke plate: These three carbs have a lever choke that swings a plate to block air flow. There is no enrichment fuel path or jet. So the float bowl has no choke jet. The other baby Keihins with cable or vacuum operated choke do have a choke jets in their float bowls. The choke (enrichment) fuel passes up through the sealed off corner of the bowl gasket.

Float Bowl: The PA-03A and 03B chamber set (float bowl, float bowl gasket, drain screw and drain screw o-ring) from 1970’s Honda mini-cycles (Mini Trail or Monkey) interchanges with a PA 00A, 01A chamber set from 1970’s Honda mopeds. The drain screw (4 or 6 mm) and its o-ring (2×2.5 or 1.5×4) are different. So if the float bowl is changed the drain screw must also be changed.

Needle jet: The PA-03A and 03B mini-cycle needle jets (emulsion tubes) interchange with PA 00A, 01A, and M0A moped ones. These press out with taps from a hammer and punch from above. At first the punch tip needs to be bigger than the 4 mm tube end. Once the tube end gets below the floor a smaller 3.5 to 3.9 mm straight round bar is needed. It has to enter the 4 mm hole and contact the idle tube around the edge.

Keihin MOA parts

Idle jet: A little downstream from the needle jet is the idle jet. It is a pinhole 0.015″ at the upper end of a vertical brass tube about 20mm long. The idle tube is a press fit in the carb body. Some can be pulled out with just a pliers. Some might be tighter and require a drill bit be placed inside the tube to prevent crushing from the tighter pliers grip. This tube was never intended to be replaced and is not sold or included in any common carb kit.

Air tunnels: In the front below the main air inlet are two small horizontal air tunnels. The center tunnel is main air and the side tunnel is idle air. The small amount of air sucked in through the main air tunnel passes through tiny holes in the emulsion tube and becomes thousands of microscopic air bubbles in the liquid gasoline that is being drawn upward. The tiny amount of air sucked in through the idle air tunnel passes around the idle air adjustment screw cone shape tip and goes to the vertical idle passage just above the idle jet. The idle air tunnel is the size of a regular paper clip 0.036 inch. A straightened paper clip cleans it perfectly.

PA50 speed versions

4. Keihin
∅10 BB 21A-B #148 on 1978-78 Honda PA50 I Hobbit (US) 20 mph
∅10 BB 21A-F #148 on 1979-79 Honda PA50 I Hobbit (US) 20 mph
∅12 BB 20A-C #148 on 1978-83 Honda PA50 II Hobbit (US) 30 mph

1978 PA50II 30mph

1978 PA50I 20mph

1983 Honda PA50II

#0 16100-148-645 Keihin BB 21A-B

#0 16100-148-646 Keihin BB21A-F

#0 16100-148-708 Keihin BB 20A-C

Flange mount: 42 mm bolt hole spacing

Honda’s successor to the four-stroke PC50 was the two-stroke PA50, known in the USA as Hobbit, and in Europe as Camino. It was made in Belgium by Honda Benelux, so it had a mix of Japanese and European design and componentry.

In US models, 20 mph versions were 1978-79 red. 30 mph versions were 1978-79 yellow, 1980 yellow, 1981-82 red, and 1983 black.

This Keihin BB type carburetor is not like any other moped carburetor. It looks more like a Honda generator carburetor. It is a very flat design. It has to be special because it swings up and down with the engine, and is very close to the frame at the place where you step through. The BB type floats on PA50 are wider and flatter than NC50 or Z50 floats.

#1 16010-124-760

#1 16010-156-305

Keihin (1978-83 Honda PA50) carburetor illustration

Keihin BB-20A and BB-21A

quantity
o# ⇓⇓⇓⇓ (a)BB 21A-B (b)BB 21A-F (c)BB 20A-C (d)BB 20A-F
o# abcd price Honda part# x description xxx specs
00 1o00 N/A ~~16100-148-645~~ carburetor 21A-B ∅10 20 mph 1978
00 01o0 N/A 16100-148-646 carburetor 21A-F ∅10 20 mph 1979
00 o010 N/A 16100-148-708 carburetor 20A-C ∅12 30mph 1978
00 o001 N/A 16100-148-708 carburetor 20A-F ∅12 30mph’79-83
01 1111 $14 ~~16010-124-760~~ gasket solo-set 1c 1g oo 1j
01 1111 $15 16010-156-305 gasket multi-set 1c 1g 1w 1j
1c 1111 $$2 00000-000-000 intake o-ring 2 x 20 (24 od)
1g 1111 $$2 00000-000-000 drain screw o-ring 1.5 x 4 (7 od)
1j 1111 $11 00000-000-000 float bowl gasket 2 x 50 (54 od)
o2 1010 N/A ~~16011-147-004~~ ~~16011-147-305~~
o2 1010 $21 16011-881-741 float needle stirrup type
o2 0101 $22 16011-883-005 float needle regular type
03 1010 N/A ~~16013-124-760~~
03 1010 N/A 16013-124-762 float set black 3a 3c 21A-B, 20A-C
03 0101 N/A 16013-883-305 float set white 3b 3c 21A-F, 20A-F?
3a 1010 N/A 00000-000-000 float bare black stirrup type
3b 0101 N/A 00000-000-000 float bare white regular type
3c 1111 N/A 00000-000-000 hinge pin ∅2 x 23
04 1111 N/A ~~16016-148-611~~ screw set
04 1111 N/A 16016-890-015 screw set 4a 4b 4c 4d 4e
4a 1111 0$1 00000-000-000 idle speed screw M4 x 15 slot
4b 1111 N/A 00000-000-000 idle speed spring
4c 1111 N/A 00000-000-000 idle fuel screw
4d 1111 N/A 00000-000-000 idle fuel spring
4e 1111 0$3 00000-000-000 cleaning access plug M5 x 5 slot
05 1111 N/A 16024-124-760 drain screw set
07 1111 N/A 16110-148-010 choke lever cover
08 1111 N/A 16166-148-740 nozzle, main
09 1111 N/A 16199-148-611 vent hose ∅3.5 ∅6.5 x 65 gray
09 1111 .50 16199-148-sub substitute ∅3.1 ∅6.3 x 65 clear
10 1111 0$2 0-93500-04008 cable pinch screw M4 x 8
11 2222 0$1 0-93500-04012 bowl screw M4x12 pan phillips
12 2222 .50 0-94111-04800 lock washer M4 split
13 1111 N/A 95001-35400-40 drain hose ∅3.5 ∅7.0 x 400 gray
13 1111 0$1 95001-35400sub substitute ∅3.1 ∅6.3 x 400 clear
14 1010 0$7 99101-124-600 main jet 60 21A
14 0101 0$7 99101-124-780 main jet 78 20A
15 1111 N/A 0-95002-02070 drain hose clamp B7 (for 7 not 6.3)
16 1111 N/A 0-95002-02065 vent hose clamp B6.5

PA50 carb removal

Servicing: The best way to remove the PA50 carburetor is to hold the back of the bike up by either a rope tied to an overhead beam, or with a milk crate and blocks of wood. Remove the floorboards and side covers. Unplug the ignition wires from the coil at the right rear. Pull them through and move them out of the way. Disconnect the decompression cable and the spark plug cap. Loosen the wiring clamps so there is slack in the wires. Remove the lower rear shock bolts and the swing arm pivot bolt above the engine. Then the whole sub-frame can be moved away from the main frame, either by lifting the back of the bike up, or by swinging it around sideways.

Note that the float bowl can go on two different ways. The wrong way assembles normally, but causes the vertical brass overflow tube to contact the float. Honda designed all of the cleaning ports, drain screws, and adjustment screws to face the right side of the bike, which is the upper left in the exploded view. The drain hose spigot on the float bowl faces the same way as the adjustment screws. The other way to tell is by shaking the carburetor. If you can hear the float rattling inside then the float is not stuck so the float bowl is on correctly.

While every other moped carburetor is a sliding throttle valve type, this one is a swinging plate throttle valve. The reason is to be flatter, to get more clearance from the bottom of the frame. The manual choke is also a swinging plate, with an automatic release.

Some servicing can be done with the carburetor installed. It is easy to clean the idle passages and jet by spraying a one second long burst of carb spray into the idle mixture screw hole, followed by compressed air. The running engine is allowed to consume the flammable solvent before the next burst is sprayed in, to prevent the engine from getting flooded.

1975-78 PF50M

5. Keihin
size carb model code years Honda models
∅12 006A on #131 1974-75 MR50 Elsinore (US)
∅10 PA06A on #122 1973-75 PM50 Canguro, PM50 Novio 40 km/h
∅10 PA07A on #143 1975-78 PF50M, PF50MR (BE,NL,NZ) 40 km/h
∅12 PA07A on #143 1975-78 PF50M, PF50MR (FR,UK,CA) 50 km/h

1973 Honda PM50 Canguro

1974 Honda PM50 Novio

#0 16100-131-004 Keihin 006A

#0 16100-122-024 PA06B

#0 16100-143-620 Keihin PA07A

Flange mount: PA06A PA07A 32 mm bolt hole spacing
Spigot-mount: 006A

Cable-choke: The choke cable passes through the carb top along with the throttle cable.

Float: These carbs have a black float 16003-114-004 but a non-stirrup type float needle. The float needle and seat are sold as a set 16011-122-004.

#1 16010-131-004

#1 16010-122-305

Keihin PA06A-A and PA07A-A

quantity
o# ⇓⇓⇓ Keihin (a)006A (b)PA06A (c)PA07A
o# abc price Honda part# x description xxx specs
00 10o N/A 16100-131-004 carburetor ∅12 006A 74-75 MR50
00 o00 N/A ~~16100-122-004~~
00 o00 N/A 16100-122-014 carburetor ∅10 696A
00 o00 N/A 16100-122-024 carburetor ∅10 PA06B
00 01o N/A 16100-122-690 carburetor ∅10 PA06A PM50 < 20101
00 01o N/A 16100-122-691 carburetor ∅10 PA06A PM50 > 20100
00 01o N/A 16100-122-692 carburetor ∅10 PA06A PM50 > 20100
00 o01 N/A 16100-143-620 carburetor ∅12 PA07A PF50M, PF50MR
00 10o N/A 16010-131-004 gasket solo-set 5-piece 1a d e f o i
01 011 N/A ~~16010-122-004~~ ~~16010-122-014~~
01 011 N/A 16010-122-305 gasket multi-set 7-piece 1a d e f h i s
1a 111 N/A 00000-000-000 top gasket Ø1.5
1d 111 0$2 16176-551-004 main jet o-ring 1 x 3 (5 od)
1e 111 $13 16197-063-004 jet pad disk Ø7.5 x 1.8
1f 111 N/A 00000-000-000 float bowl gasket Ø1.5
1h 011 $$2 00000-000-000 intake o-ring 2 x 18 (22 od)
1i 111 0$2 16175-260-004 drain screw o-ring 2×2.5(6.5od)
1s 111 N/A 00000-000-000 float valve o-ring 1.5 x 5 (8od)
96 011 N/A 99201-122-0650 main jet push-in #65 PA06A
96 100 N/A 99201-122-0750 main jet push-in #75 006A PA07A?

1. Keihin Parts for 1966-73 P50, PC50, PC50A, PC50K1, PF50, PS50

April 3, 2021

== carb ID# ============ M O P E D S ===========
1. 50A, 50B– 1966-68 Honda P50 xxxxxxxxxxxx 40 kmh OHC
1. 610 (50B) 1967-68 Honda P50 Little Honda   40 kmh OHC
2. C4B, C5B 1969-70 Honda PC50A xxxxxxx 40,50 kmh OHC
2. C5A, C5A 1969-70 Honda PC50 Little Honda   40 kmh OHC
2. S4A, S5A 1969-70 Honda PS50 xxxxooo x 40,50 kmh OHC
2. F4A, F5A   1970-73 Honda PC50K1, PF50 x 40,50 kmh OHV
2. S4B, S5B 1970-71 Honda PS50 xxxxxxxxooo 50 kmh OHV

1. Keihin
carb model code years frame number range models
50A-000 #044 1966-67 P25-A000001-00000 Honda P25
50A-610 #044 1967-68 P50-100001-148606 Honda P50
50A-610 #044 1967-68 P50-100001-148606 Honda P50 Little Honda (US)
50B-NL #044 1967-68 P50-128651-148606 Honda P50 (Netherlands)
50B-000 #044 1968-68 P50-148607-000000 Honda P50
50B-000 #044 1968-68 P50-148607-000000 Honda P50 Little Honda (US)

1964 P25 (NL model)

1967 Honda P50

1968 P50 (US model)

Bore: 42.0 mm, stroke 35.6 mm, displacement: 49.3 cc. P50’s have down-draft carburetors, unusual.
50B carbs do not have a replaceable float valve. It’s part of, and only sold with, the float chamber cover.
50B has a larger carb size ∅11? and jet #68 or 62. 50A has a smaller carb size ∅9? and jet #60 or 55.

#0 16010-044-004

#1 16010-044-680

Honda P50 carburetors

=00 quantity Keihin
0#=00 ⇓⇓⇓⇓ (a)50A(b)50A-610 (c)50B-N (d)50B
0#=00 abcd price Honda part# description specs
00=00 1000 N/A ~~16100-044-030~~
00=00 1000 N/A 16100-044-315 carburetor 50A-000 ’66-67
00=00 0100 N/A 16100-044-405 carburetor 50A-610 ’67-68
00=00 1100 N/A 16010-044-004 gasket set 10-piece 4 12 13
00=00 1100 N/A 16010-044-004 15 20 20 20 24 27 32
00=00 1100 N/A 16151-044-681 jet needle
11=00 1100 N/A 16125-044-004 float valve set
12=00 1100 N/A 16173-001-004 rubber seal ring
13=00 1100 N/A 16188-044-004 valve fiber washer 7.2 x 10.5
16=00 1000 N/A 16133-044-004 needle jet
16=00 0100 N/A 16133-044-681 needle jet 2.6 x 1.55
17=00 1000 N/A 0-99144-03804 slow jet 38
17=00 0100 N/A 0-99144-03504 slow jet 35
24=00 1100 N/A 16123-044-004 jet access gasket
25=00 1000 N/A 0-99120-06014 main jet 60
25=00 0100 N/A 0-99120-05514 main jet 55
26=00 1100 N/A 16112-044-004 float chamber cover
30=00 4400 0$1 0-93600-04008 sunk-phillips screw M4 x 8
32=00 1100 N/A (not sold separately) choke shaft o-ring
=======================================
00=00 0010 N/A 16100-044-681 carburetor 50B-NL ’67-68
00=00 0001 N/A 16100-044-683 carburetor 50B-00 1968
01=00 0011 N/A 16010-044-680 gasket set 4-piece 4 15 20 27
1n=27 1111 0$3 16174-044-004 float o-ring 1.5 x 40 (43od)
1p=04 1111 0$5 16171-044-004 top rubber washer 10 x 15 x 1
1r=15 1111 0$5 16175-001-004 needle jet o-ring 2 x 4 (8od)
1i =20 3333 0$2 16175-260-004 jet/screw o-ring 2 x 2.5 (6.5od)
02=00 0011 N/A 16012-044-681 needle set 2a 2b 2c 2d
2a=06 1111 0$5 16156-044-004 throttle w-clip
2b=07 1111 0$2 16157-044-004 needle e-clip 1.5 for 2.0 needle
2c=00 0011 N/A 16151-044-683 jet needle
2d=00 0011 N/A 16133-044-683 needle jet 2.6 x 2.0
03=00 1111 N/A 16014-044-004 top set 3a 3b 1p
3a=03 1111 N/A 16119-044-004 carb top M16-1.0
3b=02 1111 0$3 16118-044-004 cable adjuster male M6-0.75
04=00 0011 N/A 16015-044-014 chamber/valve set 4a 1n
4a=00 0011 N/A 16112-044-014 chamber cover w/valve
05=00 1111 N/A 16016-044-014 screw set 5a 5b 5c 5d 1i 1i
5a=18 1111 N/A 16163-044-014 idle speed screw
5b=19 1111 N/A 16162-259-004 idle air screw
5c=21 1111 N/A 16182-011-004 idle speed spring
5d=22 1111 N/A 16181-202-004 idle air spring
06=00 0011 N/A 16022-044-680 valve (slide) set 6a 6b
6a=09 1111 N/A 16141-044-683 throttle valve (slide)
6b=05 1111 N/A 16185-044-004 throttle spring
10=00 0022 .80 00-93500-03008 phillips screw M3 x 8
13=00 0o10 N/A 99114-044-0681 main jet 68
13=00 00o1 N/A 00-99120-06214 main jet 62
14=00 0011 N/A 99203-044-5201 slow jet

Part Sets: Before 1968 most Honda parts were sold individually. That is how the top carb is listed and illustrated. Starting in 1968, many Honda parts were only sold in sets. That is how the bottom carb is listed and illustrated.

Parts for the top carb that are the same as the bottom, are only listed in the bottom carb parts.

2. Keihin
size carb model code eng years frame number range Honda models
0∅9 C4A on #063 ohc 1969-70 PC50-1000000 to 1057917 PC50 xxxxxx40 km/h
∅10 C5A on #063 ohc 1969-70 PC50-1057918 to 1060412 PC50 (1306302) 50 km
∅10 C5A on #063 ohc 1969-70 PC50-1060413 to 0000000 PC50 Little Honda (US)
∅10 C5A on #064 ohc 1969-70 PS50-1000000 to 1001412 PS50 xxxxxx50 km/h
∅10 S5A on #064 ohc 1969-70 PS50-1001413 to 0000000 PS50 xxxxxx50 km/h
0∅9 C4B on #081 ohv 1970-71 PC50-2000000 to 2039616 PC50K1 xxxx40 km/h
∅10 C5B on #081 ohv 1970-71 PC50-2039617 to 0000000 PC50K1 xxxx50 km/h
∅10 S5B on #082 ohv 1970-71 PS50-2000000 to 0000000 PS50K1 xxxx50 km/h
0∅9 F4A on #081 ohv 1971-73 PC50-0000000 to 0000000 PC50K1 xxxx40 km/h
∅9 o F4A on #099 ohv 1970-73 PF50-1000000 to 0000000 PF50 Amigo 40 km/h
∅10 F5A on #081 ohv 1971-73 PC50-0000000 to 0000000 PC50K1 xxxx50 km/h
∅10 F5A on #099 ohv 1970-73 PF50-1000000 to 0000000 PF50 Amigo 50 km/h

1968 PC50A (Euro)
with OHC engine

1969-70 PC50 (USA) with OHC engine

1973 Honda PC50K1
with OHV engine

1969-70 PC50: Before April 1970, the PC50 had a OHC engine (over head cam). Bore 42.0 mm, stroke 35.6 mm, displacement 49.3 cc. The valves were operated by a cam in the head, driven by a cam chain.

Spigot mount: The Keihin C4A, C5A, C4B, C5B carburetors for the early 1969-70 PC50A were spigot mount type. They had a round float bowl gasket (with three flat sides when installed), a push-in jet, jet pad, completely round “donut” float, all metal float needle with replaceable float seat.

1970-73 PC50K1: After April 1970, the PC50K1 had a OHV engine (over head valve). The valves were operated by pushrods from a cam down in the case.

Flange mount: The Keihin F4A, F5A, carburetors for the 1970-73 PC50K1 were flange mount type with 32mm bolt spacing. There was a diamond shaped gasket rather than an o-ring like all later flange mount carbs. Everything else was the same, round float bowl gasket (with three flat sides when installed), a push-in jet, jet pad, completely round “donut” float, all metal float needle with replaceable float seat.

Keihin C5A carburetor

Keihin F4A carburetor

#1 16010-063-000
1d 1e 1n 1p 1r

#1 16010-063-004
1d 1e 1n 1p 1q .

#1 16010-114-305
1d 1e 1n 1p 1r 1v

Keihin C4A, C4B, C5A, C5B

0o quantity
o# ⇓⇓⇓⇓⇓⇓ Keihin (a)C4A (b)C5A (c)C4B (d)C5B (e)F4A (f)F5A
o# abcdef price Honda part# description specs
00 100000 N/A 16100-063-690 carb. C4A ∅9 69-70 PC50
00 010000 N/A 16100-063-004 carb. C5A ∅10 69-70 PC50, PS50
00 001000 N/A 16100-081-690 carb. C4B ∅9 70 PC50K1 < 2039617
00 000100 N/A 16100-081-014 carb. C5B ∅10 70 PC50K1 > 2039616
00 000010 N/A 16100-099-690 carb. F4A ∅9 70-73 PC50K1, PF50
00 000001 N/A 16100-099-600 carb. F5A ∅10 70-73 PC50K1, PF50
01 111011 $25 16010-063-004 gasket solo-set 1d 1e 1n 1p 1q
01 000100 $17 16010-063-000 gasket solo-set 1d 1e 1n 1p oo 1r
01 000100 $20 16010-114-305 gasket multi-set 1d 1e 1n 1p 1q 1r
1d 111111 0$2 16176-551-004 main jet o-ring 1 x 3 (5 od)
1e 111111 $13 16197-063-004 jet pad disk Ø7.3 x 1.9
1n 111111 0$3 16173-063-004 float bowl o-ring 1.5 x 40 (43 od)
1p 111111 0$5 16171-044-004 top rubber washer 10 x 15 x 1
1q 111011 0$9 16189-056-004 drain screw seal washer 6 x 8 x 0.5
1r 000100 0$5 16175-001-004 drain screw o-ring C5B 2 x 4 (8od)
02 001101 N/A 16012-064-004 needle set F5A 2a 2c 2d 2f
2a 111101 N/A 16051-063-004 jet needle C4A C5A C4B C5B F5A
2b 000010 N/A 16051-063-690 jet needle F4A
2c 111111 0$5 16156-044-004 needle w-clip
2d 111111 0$2 16157-044-004 needle e-clip 1.5 for 2.0 needle
2e 110000 N/A 16133-063-004 needle jet C4A C5A 2.1 x 2.5
2f 001101 N/A 16133-081-004 needle jet C4B C5B F5A
2g 000010 N/A 16133-081-690 needle jet F4A
03 111111 N/A 16013-064-004 float set 3a 3b 3c 3d 3e 10
3a 111111 $13 16123-063-004 float needle (all metal)
3b 111111 N/A 16122-063-004 float
3c 111111 N/A 16127-063-014 float arm
3d 111111 N/A 16126-063-014 float hinge pin
3e 111111 N/A 16196-063-014 float pin plate
04 111111 N/A 16014-064-004 top set 4a 4b 1p
4a 111111 N/A 16119-063-004 top with pipe
4b 111111 N/A 16118-045-004 cable adjuster female M6-0.75
05 111011 N/A 16015-064-004 chamber set 5a 5c 1n 1q
05 000100 N/A 00000-000-000 chamber set 5b 5d 1n 1r
5a 111011 N/A (not sold separately) chamber bare
5b 000100 N/A (not sold separately) chamber bare
5c 111011 N/A 16164-225-004 drain screw C4A C5A C4B F4A F5A
5d 000100 N/A 16162-304-004 drain screw C5B
06 111111 N/A 16016-063-004 adjustment screw set
6a 111111 N/A 16163-063-014 idle speed screw
6b 111111 N/A 16162-044-004 idle air screw & spring
6c 111111 N/A 16181-250-004 idle speed spring
07 111111 N/A 16022-063-004 throttle valve set
7a 111111 N/A 16141-063-004 throttle valve (slide)
7b 111111 N/A 16185-044-004 throttle spring
09 111111 N/A 16194-063-004 cable pipe cover
10 222222 $1.00 93500-0300500A phillips screw M3 x 5
11 222222 $1.00 93500-040120A phillips screw M4 x 12
12 111111 $0.50 94111-030000 spring washer M3
13 222222 $0.20 94111-04000 spring washer M4
15 101010 N/A 99201-063-0550 main jet #55 push-in see jets below
15 010101 N/A 99201-063-0620 main jet #62 push-in see jets below
18 111111 N/A (not sold separately) idle jet press-in tube 0.35=0.0138″

Keyster 0605 kit for PC50A has no #1e
for C4A except no 1e, C5A except 15 1e
for C4B except 2f 1e, C5B except 2f 15 1e
for F4A except 2g 1e, F5A except 2f 15 1e

#5c #5d drain plugs

Zenith 11-HL on 1970’s Spanish Honda PS50

1970 Honda PS50

3. Keihin Parts for 1977-83 NC50, NA50, NX50, NU50, NCZ50

April 3, 2021

== carb ID# ============ M O P E D S ===========
6. PA 08B-A 1977-78 Honda NC50 Express xxx 30 mph TS
6. PA 08B-B 1977-79 Honda NC50, NA50 xxxx 30 mph TS
6. PA 08C-A 1978-79 Honda NC50, NA50 xxxx 30 mph TS
6. PA 08E-A 1980-80 Honda NC50 Express xxx 30 mph TS
6. PA 08E-B 1980-80 Honda NC50 Express xxx 30 mph TS
6. PA 08D-A 1980-80 Honda NA50 Express II x 30 mph TS
7. PA 12A-A 1981-81 Honda NCZ50 Moto Compo
7. PA 15A-A 1981-81 Honda NC50 Express xxx 30 mph TS
7. PA 16A-A 1981-81 Honda NA50 Express II x 30 mph TS
7. PA 13B-A 1981-82 Honda NX50 Express SR x 30 mph TS
7. PA 13B-B 1982-83 Honda NC50 Express xxx 30 mph TS
7. PA 13E-A 1982-83 Honda NU50 Urban Express 30 mph TS
7. PA 25A-A 1982-83 Honda NC50AA, NU50AA 25 mph TS

6. Keihin
size carb model code year 00 frame number range 000 model
∅12 PA08B-A or B #147 1977 NC50-1139281 to 0000000 NC50 Express (US) 30 mph
∅12 PA08B-A or B #147 1978 NC50-2000013 to 0000000 NC50 Express (US) 30 mph
∅12 PA08E-A or B #147 1979 NC50-2100011 to 0000000 NC50 Express (US) 30 mph
∅12 PA08E-A or B #147 1980 NC50-2200005 to 0000000 NC50 Express (US) 30 mph
∅12 PA08B-B on #163 1979 AB01-5000001 to 0000000 NA50 Express II (US) 30 mph
∅12 PA08D-A on #163 1980 AB01-5200001 to 0000000 NA50 Express II (US) 30 mph

1977 Honda NC50 Express

1978 Honda NC50 Express

’79 NC50 Express

1980 Honda NC50 Express

1980 Honda NA50 Express II

#0 16100-147-675
Keihin PA08B-A

#0 16100-147-676
Keihin PA08B-B

#0 16100-147-711
Keihin PA08E-A

#0 16100-147-712
Keihin PA08E-B

16100-163-771
Keihin PA08D-A

Flange Mount: 38 mm hole spacing. 2 x 20 (24 od) intake o-ring.

Honda Express carburetor versions

Cable choke: This carburetor has a throttle cable and a choke cable coming straight up and looping around. It has no vent hoses, vacuum hoses, or oil lines going into it. The oil injection goes into the intake manifold. The float reservoir vent is just a small tube slanting downward.

As with most Honda carburetors, fuel is never allowed to spill onto the engine or anything else. Instead an overflow tube inside the float chamber allows any overflow fuel to flow out and down the drain hose and onto the ground below the engine.

The 1977-79 Honda NC50 and NA50 each had two carburetor versions, PA08B-A and PA08B-B. Regardless of the year, or the VIN number, they could have either version. So the customer had to look at the model number stamped into the carburetor, and tell the Honda dealer that number, to get certain parts correct.

Oil injection hose location: The 1977-79 Honda Express had the oil hose going into the intake manifold, not the carburetor. The 1980 and later models had the oil injection hose going into the carburetor at the throttle slide area. There must have been some benefit, like maybe throttle slide lubrication.

16010-143-620
has a, c, d, e, f, g
for PA08 BA

16010-143-305
a, c, d, e, f, g, h, i
for PA08 BA

16010-147-004
has b, c, f, g
for PA08 BB, EB

16010-147-711
has b, c, d, f, g
08 BB EB DA EA

16010-147-505
has b, c, d, f, g, i
08 BB EB DA EA

quantity
o# ⇓⇓⇓⇓⇓ Keihin PA(a)08BA (b)08BB (c)08EA (d)08EB (e)08DA
o# abcde price Honda part#x description xxx specs
10 1oooo N/A ~~16100-147-673~~
10 1oooo N/A 16100-147-675 carburetor 77-79 NC50 PA 08B-A
10 o1ooo N/A 16100-147-676 carb 77-79 NC50 NA50 PA 08B-B
10 oo1o0 N/A 16100-147-711 carburetor 1980 NC50 PA 08E-A
10 oo01o N/A 16100-147-712 carburetor 1980 NC50 PA 08E-B
10 oooo1 N/A 16100-163-771 carburetor 1980 NA50 PA 08D-A
o1 10ooo $26 16010-143-620 gasket solo-set 1a o c d e f g
o1 10ooo $28 16010-143-305 gasket multi-set 1a o c d e f g h i
o1 01o1o $23 16010-147-004 gasket solo-set oo b c o o f g
o1 o1111 $23 16010-147-711 gasket solo-set oo b c d o f g
o1 o1111 $24 16010-147-505 gasket multi-set oo b c d o f g o i
1a 100o0 $$3 00000-000-000 top rubber washer 10 x 18 x 1
1b o1111 $$8 00000-000-000 top rubber washer 13 x 16.5 x 1
1c 11111 $$2 00000-000-000 intake o-ring 2 x 20 (24 od)
1d 1o1o1 0$2 16176-551-004 jet or screw o-ring 1 x 3 (5 od)
1e 1o0oo $13 16197-063-004 jet support pad disk Ø7.5 x 1.8
1f 11111 $18 00000-000-000 float bowl gasket Ø1.5 NC50-type
1g 11111 $$2 00000-000-000 drain plug o-ring 1.5 x 4 (7 od)
o2 1oo1o $21 16011-881-741 float needle valve stirrup
o2 1oo1o $36 16011-881-741 float needle genuine stirrup
o2 o11o1 $22 16155-883-005 float needle valve regular
o3 1o1o0 N/A 16012-147-004 needle set 3a 3b 3c 3d 08BA EA
o3 ooooo $22 16012-130-640 needle set 3a 3b 3c 3d PA 03A-A
o3 ooooo $22 16012-165-014 needle set 3a 3b 3c 3d PA 03B-A
o3 o1o11 $15 16012-147-014 needle set 3a 3b 3c 08BB EB DA
3a 11111 0$5 16156-044-004 jet needle w-clip
3b 11111 0$2 16157-044-004 jet needle e-clip 1.5 for Ø2.0 needle
3c 11111 $10 00000-000-000 jet needle Ø2.0 D348 thick 08B-A,
3c 11111 $10 00000-000-000 PA 08B-B, 03A-A, 00A, 01A
3c ooooo $10 00000-000-000 jet needle Ø2.0 D117 thin 03B-A,
3c ooooo $10 00000-000-000 PA 03C-A, 03D-A, 03H-B, 03M-A, etc
3d 1o1oo N/A 00000-000-000 needle jet (emulsion tube) 08BA 08EA
3d o1o11 N/A 00000-000-000 needle jet & jet fixed 08BB 08EB 08DA
3d ooooo $10 00000-000-000 needle jet (emulsion tube) PA 03A-A
3d ooooo $10 00000-000-000 needle jet (emulsion tube) PA 03B-A
o4 1oo1o N/A ~~16013-143-620~~
o4 1oo1o $46 16013-099-691 float set 4a oo 4c 4d black stirrup
o4 o11o1 $28 16013-147-004 float set oo 4b 4c 4d white regular
4a 1oo1o N/A 00000-000-000 float bare, solid black foam stirrup
4b o11o1 $21 00000-000-000 float bare hollow white plastic regular
4c 11111 $$4 00000-000-000 hinge pin substitute Ø2 x 18.5
4d 11111 $$3 0-93600-04006 hinge screw M4x6 sunk phillips

1977-79 NC50 idle adjustment screws
7a idle speed screw, tighter is faster
7c idle air mix screw, tighter is richer

o5 1oooo $23 16014-143-620 top set substitute 5a 1a M20-1.0
o5 o1111 $22 16014-147-004 top set substitute 5a 1b M18-1.0
o6 1oooo N/A 16015-147-004 chamber set A 6a oo 6c 1e 1f 1g for jet pad
o6 o1111 N/A 16015-147-014 chamber set B oo 6b 6c oo 1f 1g for no pad
6a 1oo0o N/A 16015-147-004 float bowl A shallow with pad holder
6b o1111 N/A 16015-147-014 float bowl B shallow, no jet pad holder
6c 11111 $16 00000-000-000 float drain screw M6x20 special
o7 11o1o $15 16016-143-620 screw set 7a b c d idle air
o7 oo101 N/A 16016-147-711 screw set 7a b o d e f g idle fuel
7a 11111 $$4 00000-000-000 idle speed screw M4x19 special
7b 11111 $$2 00000-000-000 idle speed screw spring Ø5.6 x 10
7c 11o1o $$9 00000-000-000 idle air screw M6-0.75 thick tip
7d 11111 $$7 00000-000-000 idle air or fuel spring Ø4.8 x 9
7e oo1o1 $12 00000-000-000 idle fuel screw M6-0.75 thin tip
7f oo1o1 $$7 00000-000-000 idle fuel screw washer 3.1 x 5.0 x 0.5
7g oo1o1 0$2 16176-551-004 idle fuel screw o-ring 1 x 3 (5 od)

1980-83 NC50 idle adjustment screws
7a idle speed screw, tighter is faster
7e idle fuel mix screw, tighter is leaner

o8 11111 $38 16022-143-620 valve set 8a, 8b
8a 11111 $22 00000-000-000 throttle slide Ø13 #15A
8b 11111 $12 00000-000-000 throttle spring original Ø9.5 x 42
8b 11111 $$7 00000-000-000 throttle spring substitute shorter, stiffer
o9 11111 $25 16046-147-004 choke set substitute 9a 9b 9c
9a 11111 $15 00000-000-000 choke top substitute M12-1.0
9b 11111 $$4 00000-000-000 choke spring substitute
9c 11111 $12 00000-000-000 choke slide substitute

11 11111 $2.00 16118-166-004 rubber boot substitute Dellorto
12 22222 $1.00 93500-04012 bowl screw M4x12 pan phillips
13 22222 $0.20 94111-04000 lock washer M4 split
14 11111 $1.00 95001 – 35003 hose substitute 1/8 x ¼ 3.1 x 6.3

15 11111 N/A 95002 – 02070 drain hose clamp B7 (for 7 not 6.3)
16 10o0o N/A 99201.081.0780 push-in jet 78 08BA
16 10o0o $23 substitute jet, #70 drilled to 78 08BA
16 01111 N/A fixed needle jet & jet pressed in 08BB EA EB DA
this jet is 0.78mm 0.0307″, cleaned with a #69 drill 0.0292″

00 22222 $1.00 mount bolt, nut and washer M6 x 20

Float: The white float with non-stirrip needle for PA08B-B and the black float with stirrup type needle for PA08B-A do not interchange. The white float is too “tight” on the PA08B-A. Something restricts its movement. The black float is too “loose” on the PA08B-B. It moves a lot before moving the needle.

Main Jet: On PA08BB, EA, EB and DA versions the main jet is a tamper-proof tight press-fit type, in the center. The jet cannot be removed, and cannot be replaced. It is 0.78 mm – 0.0307″, and can be cleaned perfectly with a #69 drill 0.0292″.

On a PA08BA the main jet presses or slides in and out, and is supported by a rubber disk. If the disk is missing, the jet can slide downward, allowing fuel to get past the jet o-ring, causing a rich fuel mixture.

Idle Hole Cleaning: Near the engine side of the carb body is a brass tube that dips down into the liquid gasoline. That tube, about 1.5 mm (0.060″) inner diameter and 20mm long, leads to the idle or pilot jet, which is about 0.30 mm (0.012″). The idle jet gets clogged from sitting, then the engine will run but won’t idle. Nothing but a very thin (0.010″) steel guitar string will clean it out. See below about jet drills and cleaning tiny jets. Ultrasonic parts cleaners, carb spray, carb dip, and compressed air are not usually effective. Another way to clean out the idle jet is to 1) place a drill bit that fills the hole (so it does not get crushed), 2) clamp it with a small vise grips, 3) rotate back and forth while pulling, 4) when it comes out, the actual hole is easy to see and clean, 5) press it back in the same way it came out.

Strong solvent is needed to dissolve varnish or tar residue left from years of sitting. Carburetor spray, parts dip, or acetone all help clean out the tar, sometimes with a lot of scraping, brushing or rubbing. Always remember to remove all rubber things first, to not let the rubber touch the solvent. Strong solvents will swell soft rubber, deforming it. Never soak the whole carburetor in strong solvent. In this way, Shaun (at Royal Cyclery and later at Myrons Mopeds) has successfully cleaned out over 100 Honda Express carburetors, without ever replacing any of the rubber gaskets. Part of the reason was they were only sold at Honda dealers, but nonetheless, they are not needed in a normal service or clean-out.

Keihin PA08C-A: This is approximately for a 1979-80 NC50, or maybe NA50. It is identical to a PA08B-B. It has the same white float, non-stirrup float needle, fixed jet, 18mm top threads, and same gaskets. The idle mixture screw type is unknown. No photo available.

7. Keihin
size carb model code years models
∅12 PA12A-A on #GC6 1981-81 Honda NCZ50 Moto Compo
∅12 PA15A-A on #190 1981-81 Honda NC50 Express (US) xxxxx xxxx 30 mph
∅12 PA16A-A on #193 1981-81 Honda NA50 Express II (US) xxxx xxx 30 mph
∅12 PA13B-A on #187 1981-82 Honda NX50 Express SR (US) xxxx xx 30 mph
∅12 PA13B-B on #GA6 1982-83 Honda NC50 Express (US) xxxxx xoxx 30 mph
∅12 PA13E-A on #GC1 1982-83 Honda NU50 Urban Express (US) xxxx 30 mph
∅12 PA13E-A on #GC1 1982-83 Honda NU50M Urb. Expr. Deluxe (US) 30 mph
∅11 PA25A-A on #GA6 1982-83 Honda NC50AA Express (Iowa) xxxxxx 25 mph
∅11 PA????? on #GC1 1982-83 Honda NU50AA Urban Express (Iowa) 25 mph
∅10? PA25A-A on#GC1 1982-83 Honda NU50MA Urb. Ex. Deluxe (Iowa) 25 mph

1981 NC50 Express

1981 NA50 Express II

1981 NX50 Express SR

1982 NU50 Urban Express

#0 16100-GC6-003 Keihin PA12A-A

16010-187-003 gasket set

#0 16100-190-672
Keihin PA15A-A

#0 16100-193-672
Keihin PA16A-A

#0 16100-187-673
Keihin PA13B-A

#0 16100-GA6-671
Keihin PA13B-B

#0 16100-???-???
Keihin PA25A-A

#0 16100-GC1-671
Keihin PA13E-A

Flange Mount: 38 mm hole spacing, 2 x 20 (24 od) o-ring on NC50, NA50 (PA15A-A, PA16A-A, PA13B-B)
Flange Mount: 32 mm stud spacing, 2 x 18 (22 od) o-ring on NX50, NU50, NU50M (PA13B-A, PA13E-A)
Flange Mount: 36 mm hole spacing, 2 x 20 (24 od) o-ring on NC50I, (PA25A-A)

Vacuum-operated automatic choke: These carburetors feature a screw-in main jet, and a built-in vacuum-operated (not electric) automatic choke. When the temperature switch on the head is cold, it allows the engine vacuum to raise the choke plunger up, which opens a new fuel passage, to enrich the mixture during cold starting. As the engine warms up, it closes the vacuum, allowing the thin spring to pull it back down, for normal running. The more precise term for this is “automatic vacuum operated cold start fuel mixture enrichment device”. The 1981-83 automatic choke device itself is not replaceable.

The vacuum source hose has a check ball valve that only allows air flow into the carburetor venturi, and not back out. It needs this even though there is reed valve, because there is still some residual reverse flow caused by the forward and reverse motion of the piston.

The vacuum choke that came out in 1981 did not last long. After 1983, 50cc on-road Honda’s had electric chokes, because they were electric-start scooters with 12 volt batteries.

Identical twins: The PA16A-A looks identical to the PA15A-A. It is on the 1981 Honda NA50 Express II, the final year of that USA-only model. They both have 38 mm flange hole spacing, #75 screw-in jet, 20 mm intake o-ring and the non-stirrup type B float needle. The only difference is the top cable curved pipe. On a PA15A-A it is permanently attached to the screw-on top cap with a swivel joint, while on a PA16A-A the curved cable pipe is detachable.

Intake studs: After 1981 these carbs had studs instead of threaded holes in the mounting flange, except for PA25A-A. PA13B-A and PA13E-A studs are spaced 32 mm with a 18mm intake o-ring. PA13B-B studs are spaced 38 mm, with a intake o-ring 20 mm.

Iowa carb: The PA25A-A is like a PA13B-A, with M18-1.0 top cap threads, 13.0 mm slide, vacuum-operated automatic choke, choke jet in float bowl, tall 2.5 x 1.5 float bowl gasket, intake o-ring 20 mm, 38mm mount spacing, non-stirrup type float and float needle, screw-in main jet size 75. The only noticeable difference is the absence of studs.

Iowa cylinder: The exhaust port is restricted. Here left is 49-state, right is Iowa.

Keihin PA12A-A: This carb from a NCZ-50 has a cable choke like the ’77-79 NC50 carbs. But it has a different part number, 16046-GC6-003 instead of 16046-147-004. Despite that, the NC50 replacement cable choke top and choke pieces fit the NCZ50.

#1 16010-190-004
for 15A 16A 13BB 25A

#1 16010-187-003
for 12A 13BA 13EA

#1 16010-GF8-305 for
for PA 13BA 13EA

PA 15AA 16AA 13BA 13BB 13EA

quantity
o# ⇓⇓⇓⇓⇓⇓ PA (a)15AA (b)16AA (c)13BA (d)13BB (e)25AA (f)13EA
o# abcdef price Honda part#x description xxx specs
00 1o0000 N/A 16100-190-672 carburetor ’81-81 NC50 PA15A-A
00 o10000 N/A 16100-193-672 carburetor ’81-81 NA50 PA16A-A
00 o01000 N/A 16100-187-673 carburetor ’81-82 NX50 PA13B-A
00 o00100 N/A 16100-GA6-671 carburetor ’82-83 NC50 PA13B-B
00 o00010 N/A 16100-GA6-671 carburetor ’82-83 NC50AA PA25A-A
00 o00001 N/A 16100-GC1-671 carburetor ’82-83 NU50 PA13E-A
01 001001 $24 16010-187-003 gasket solo-set   1b o d g h k
01 110110 $24 16010-190-004 gasket solo-set   1b c d g o k
01 001001 $25 16010-GF8-305 gasket multi-set 1b o d g h k t u
1b 111111 $$8 00000-000-000 top rubber washer 13 x 16.5 x 1
1c 110110 $$2 00000-000-000 intake o-ring 2 x 20 (24 od)
1d 111111 0$2 16176-551-004 idle fuel screw o-ring 1 x 3 (5 od)
1g 111111 $$2 00000-000-000 drain plug o-ring 1.5 x 4 (7 od)
1h 001001 $$2 00000-000-000 intake o-ring 2 x 18 (22 od)
1k 111111 $22 00000-000-000 float bowl gasket 2.5 tall by 1.5 wide
02 0010?0 N/A 16012-187-671 needle set ’81 2a 2b 2c 2d
02 001000 N/A 16012-187-731 needle set ’82 2a 2b 2c 2d
02 1100?0 N/A 16012-193-671 needle set 2a 2b 2c 2d
02 0001?1 N/A 16012-GA6-671 needle set 2a 2b 2c oo 2e
02 0000?1 N/A 16012-GC1-671 needle set 2a 2b 2c oo 2f
2a 111111 0$5 16156-044-004 jet needle w-clip
2b 111111 0$2 16157-044-004 jet needle e-clip for 1.5 clip groove
03 111111 $28 16013-147-004 float set white 3a 3b 3c
3a 111111 $21 00000-000-000 float bare white plastic regular
3b 111111 $$4 00000-000-000 hinge pin substitute Ø2 x 18.5
3c 111111 $$3 0-93600-04006 hinge screw M4x6 sunk phillips
04 1o0000  N/A 16014-190-014 top set NC50 fixed cable pipe M18-1.0
04 o10000 $24 16014-147-014 top set NA50 detachable pipe M18-1.0
04 o01110  N/A 16014-187-013 top set NX50, 82-83 NC50 M18-1.0
04 o00001  N/A ~~16014-GB2-003~~
04 o00001  N/A ~~16014-GB0-831~~
04 o00001  N/A 16014-098-980 top set NU50 fixed cable pipe M18-1.0
05 110000  N/A 16015-191-034 chamber set deep bowl with choke jet
05 001000  N/A 16015-187-671 chamber set deep bowl with choke jet
05 0001?0  N/A 16015-GA6-671 chamber set deep bowl with choke jet
05 0000?1 N/A 16015-187-043 chamber set deep bowl with choke jet
06 000111 $32 16016-191-004 idle fuel screw set 6a 6b 6f 1d
06 111000 $32 16016-187-003 idle fuel screw set 6a 6b 6f 1d
6e 111000 $12 00000-000-000 idle fuel mixture screw M6-0.75 special
6b 111111 $$7 00000-000-000 idle fuel mix screw spring Ø5 x 9
6f 111111 $$7 00000-000-000 idle fuel mix screw washer 3.1×5.0x0.5
07 111111 $00~~16028-187-003~~
07 111111 $15 16028-GC8-004 idle speed screw and spring 7a 7b
7a 111111 $$4 00000-000-000 idle speed screw M4x19 special
7b 111111 $$2 00000-000-000 idle speed screw spring Ø5.5×10
08 110000 $38 16022-143-620 throttle slide & spring
08 001011 N/A 16022-187-731 throttle slide & spring
08 000101 N/A 16022-191-004 throttle slide & spring
8a 11?? 1? $22 00000-000-000 throttle slide Ø13 #15A
8b 11?? 1? $12 00000-000-000 throttle slide spring Ø9.5 x 42

NC50 idle fuel screw
top: original
bottom: replacement

10 100000 N/A ~~16118-086-004~~
10 100000  N/A 16118-166-004 cable rubber boot
10 101110  N/A 16118-187-003 cable rubber boot
10 000001 N/A 16118-GB4-003 cable rubber boot
11 111111 $22 16155-883-005 float needle valve KL 18-4608
12 110110 N/A 16199-435-771 overflow hose 3.0 x 6.5
12 001001 N/A ~~16199-187-003~~
12 001001 N/A 16198-HC0-405 overflow hose 3.0 x 6.5
13 001000 N/A 16608-187-000 control hose with check ball 5 x 10
13 110000 N/A 16608-193-670 control hose with check ball 5 x 10
13 000110 N/A 16608-GA6-670 control hose with check ball 5 x 8
13 000001 N/A 16608-GC1-000 control hose with check ball 5 x 8
14 222222 0$1 93892-04012-08 screw & washer M4x12 pan phillips
15 111111 N/A 95002 – 02070   hose clamp B7 vacuum source hose
16 111000 N/A 95002 – 02100   hose clamp B10 for control hose
16 000111 N/A 95002 – 02080   hose clamp B8 for control hose
17 111111 N/A 95002 – 02650   hose clamp B6.5 for overflow hose
18 111111 N/A 95005 – 35001   vacuum (source) hose 3.5 x 7 x 130
19 oo0010 $$7 99101-187-0700 screw-in jet #70 M6-0.75 PAMOA PA25A ? 78-80 Indian, 82-83 NC50I
19 110100 0$7 99101-187-0750 screw-in jet #75 M6-0.75 PA15A 16A 13BB 81-83 NC50, 81 NA50
19 oo1000 0$7 99101-187-0780 screw-in jet #78 M6-0.75 PA13BA 81-82 NX50
19 oo0001 0$7 99101-187-0850 screw-in jet #85 M6-0.75 PA13EA 82-83 NU50

Float Valve Seat: On these carburetors the float seat (the cup that the float needle valve slides in) is carved into the actual carburetor body, and is not replaceable. Polish it with a spinning Q-tip and polish, such as Turtle Wax.

Choke jet: On all of these NC50-type carbs, both shallow and deep-float-bowl versions, there is a choke jet, pressed into a corner of the float bowl. When it gets clogged the engine will only start easily when it is warm.

Verify all jets and fuel or air passageways are open, using wires and or visually with carb spray (wear goggles).

Cable Differences: You can tell what year range a Honda Express is from a distance. A 1977 to 1980 has two cables, a throttle and a choke cable coming straight up from the carburetor. A 1981 has just a throttle cable coming straight up, but also a vacuum hose for the choke and a float vent hose. A 1982 to 1983 has a black plastic curved elbow on top, that redirects the throttle cable forward and down, a vacuum hose for the choke, and a vent hose. A 1982-83 also has a different frame, a low headlight, and a two speed transmission.

The Honda Express throttle cable curves rearward and loops downward to get below the carburetor, and then goes forward into the frame tube. The loop design adds friction, but it makes a good clean step-thru frame without any cables or wires hanging out.

1982-83 NC50 hoses

Comparison of PA MOA-A, PA 08B-B, PA 08B-A, and PA 15A-A

Keihin idle mixture screw channels
Left PA08B-B with idle air screw
Right PA15A-A with idle fuel screw

You can tell the difference between a carb with an idle air mixture screw, and a carb with an idle fuel mixture screw, by the shape of the casting at the top of the float chamber.

Keihin Menu

April 3, 2021

updated 2021-04

Click image to select:

1966-73 Honda mopeds
P50, PC50 Little Honda
PF50, PS50, PC50K1

1973-83 Honda mopeds
PC50K1, PF50R, PA50
MR50, PM50, PF50M
and Indian AMI-50

1977-83 Honda mopeds
NC50 Express, NA50
NU50 Urban Express
NU50M, NX50

1984-87 Honda scooters
NQ50 Spree, NB50 Aero
and C70 Passport

1968-09 Honda mini-cycles
Z50A Mini Trail, QA50
Z50R, XR50R, CR50F

Keihin parts by type
float needles, gaskets
jets, float chambers

Jet Cleaning Drills

Welcome

Keihin carburetors are used on almost all Honda motorcycles (or copies of Hondas). Here we focus on the 50cc moped, mini-cycle and scooter carburetors mostly from the 1970’s and 1980’s.

From Wikipedia: The Keihin Corporation was founded December 19, 1956 and currently maintains its head office in Shinjuku Ward, Tokyo, Japan. Among the products they are internationally known for is the production of carburetors and fuel injection, and is a major suppler to Honda, and also Triumph, Suzuki, Kawasaki, KTM and Harley Davidson motorcycles. In addition to carburetors, Keihin supplies the automotive industry with engine, transmission and climate control products, including intake manifold assemblies, HVAC assemblies, compressors, valves, solenoids and electronic control units. Keihin’s largest shareholder is Honda Motor Co. Ltd. Keihin first began U.S. manufacturing in 1989. Counting all U.S. locations, Keihin has more than 20,000 employees. Keihin North America’s corporate headquarters is in Anderson, Indiana.

Flange holes 42, 38, 32 mm

Keihin motorcycle carburetors are labeled with a cast-in model ID prefix followed by several numbers and letters that specify the carburetor version for that application. Most of these Honda moped, noped, mini-cycle, scooter and small motorcycle carbs are Keihin prefix “PA”. Other Keihin motorcycle carburetor model codes are PB, PC, PD, PJ, PWK, CV, CVK, VB, VD, VE.

Flange mount: The Keihin PA family of carburetors are flange mount. Flange mount carbs have a diamond shape mounting flange with bolts on either side of the main air hole. The bolt holes can have different spacing.

Carburetor replacement: When replacing a carburetor the new carb must have the same bolt hole spacing. There is a way to get around this by making the bolt holes into slots. With slotted mount holes the flange mount carb is not automatically centered, so it has to be manually positioned in the center as the mount bolts are tightened.

Inline Fuel Filters

Screw-on Adaptors

Screw-on Extenders

Seal Rings

Turnbuckle type nuts (forward and reverse thread)

Hoses and Parts

Inner Seal Discs

Contents

1. Gas Valves listed by Type 2. Gas Valves listed by Application 3. Gas Valve Parts 3. Inline Filters 3. Seal Disks 3. Extenders ——– < partition> ——– 4. Gas Valve Information

1. Gas Valves listed by Type

2. Gas Valves listed by Application

3. Gas Valve Parts

Scooters

8. Keihin PA 29C-B on #GK8 ‘84-85 Honda NQ50 Spree (US) 8. Keihin PA 29C-D on #GK8 1985 Honda NQ50 Spree (US) 8. Keihin PA 29D-A on #GK8 ‘84-85 Honda NQ50 Spree 8. Keihin PA 29D-B on #GK8 1985 Honda NQ50 Spree 8. Keihin PA 29H-A on #GE8,GN2 1983-85 Honda NB50 Aero 50

Motorcycles

14. Keihin PB 15A-A on #GB4 1982-83 Honda C70 Passport (US)

9. Keihin Z50A on #045 1968-69 Honda Z50A Mini Trail up to Z50A-255950 9. Keihin Z502 on #045 1969-71 Honda Z50A Mini Trail after Z50A-255950

10. Keihin 655-A on #130 1972-75 Honda Z50A Mini Trail 12. Keihin 674-A on #114 1970-72 Honda QA50 12. Keihin ceto and #129 1973-75 Honda QA50

12. Keihin PA 03H-A on #GW8 1988-88 Honda Z50R up to JS900485 15. Keihin PA 03H-B on #GW8 1988-91 Honda Z50R after JS900485 15. Keihin PA 03M-A on #GW8 1992-93 Honda Z50R 15. Keihin PA 03N-A on #GW8 1994-99 Honda Z50R

13. Keihin PA 42A-C on #GEL 2000-03 Honda XR50R 16. Keihin PA 42A-A on #GEL 2000-03 Honda XR50R 16. Keihin PA 42A-A on #GEL 2004-09 Honda CRF50F

15. Float needles (valves)

16. “baby” Keihin float bowls

17. Gasket Multi-App Sets (for several carburetors)

18. Jets

19. Where else to get Keihin parts

4. Keihin ∅10 BB 21A-B #148 on 1978-78 Honda PA50 I Hobbit (US) 20 mph ∅10 BB 21A-F #148 on 1979-79 Honda PA50 I Hobbit (US) 20 mph ∅12 BB 20A-C #148 on 1978-83 Honda PA50 II Hobbit (US) 30 mph

5. Keihin size carb model code years Honda models ∅12 006A on #131 1974-75 MR50 Elsinore (US) ∅10 PA06A on #122 1973-75 PM50 Canguro, PM50 Novio 40 km/h ∅10 PA07A on #143 1975-78 PF50M, PF50MR (BE,NL,NZ) 40 km/h ∅12 PA07A on #143 1975-78 PF50M, PF50MR (FR,UK,CA) 50 km/h

Click image to select:

Welcome

test1

1. Gas Valves listed by Type
2. Gas Valves listed by Application
3. Gas Valve Parts
3. Inline Filters
3. Seal Disks
3. Extenders
——– < partition> ——–
4. Gas Valve Information

8. Keihin PA 29C-B on #GK8 ‘84-85 Honda NQ50 Spree (US)
8. Keihin PA 29C-D on #GK8 1985 Honda NQ50 Spree (US)
8. Keihin PA 29D-A on #GK8 ‘84-85 Honda NQ50 Spree
8. Keihin PA 29D-B on #GK8 1985 Honda NQ50 Spree
8. Keihin PA 29H-A on #GE8,GN2 1983-85 Honda NB50 Aero 50

9. Keihin Z50A on #045 1968-69 Honda Z50A Mini Trail up to Z50A-255950
9. Keihin Z502 on #045 1969-71 Honda Z50A Mini Trail after Z50A-255950

10. Keihin 655-A on #130 1972-75 Honda Z50A Mini Trail
12. Keihin 674-A on #114 1970-72 Honda QA50
12. Keihin ceto and #129 1973-75 Honda QA50

12. Keihin PA 03H-A on #GW8 1988-88 Honda Z50R up to JS900485
15. Keihin PA 03H-B on #GW8 1988-91 Honda Z50R after JS900485
15. Keihin PA 03M-A on #GW8 1992-93 Honda Z50R
15. Keihin PA 03N-A on #GW8 1994-99 Honda Z50R

13. Keihin PA 42A-C on #GEL 2000-03 Honda XR50R
16. Keihin PA 42A-A on #GEL 2000-03 Honda XR50R
16. Keihin PA 42A-A on #GEL 2004-09 Honda CRF50F

4. Keihin
∅10 BB 21A-B #148 on 1978-78 Honda PA50 I Hobbit (US) 20 mph
∅10 BB 21A-F #148 on 1979-79 Honda PA50 I Hobbit (US) 20 mph
∅12 BB 20A-C #148 on 1978-83 Honda PA50 II Hobbit (US) 30 mph

5. Keihin
size carb model code years Honda models
∅12 006A on #131 1974-75 MR50 Elsinore (US)
∅10 PA06A on #122 1973-75 PM50 Canguro, PM50 Novio 40 km/h
∅10 PA07A on #143 1975-78 PF50M, PF50MR (BE,NL,NZ) 40 km/h
∅12 PA07A on #143 1975-78 PF50M, PF50MR (FR,UK,CA) 50 km/h