Myrons Mopeds

A8. 10x1 male spigot down with 20mm extender

A8 10×1 spigot down
20mm extender
01z2231010-b $29
←reserve on↓ off→
Italy-made by OMG

Links to photos of examples:

1978 Pacer Sport P78 original A8 (can use A2)
1979 Motron Classic with just the extender (can use A5)
1980 Motron Fairway no tank extender (can use A2)
1980 AMF Roadmaster 140 original A8
1983 AMF Roadmaster 140 replacement

A8 This valve is an A2 plus a C10.195 extender. The extender costs as much as the valve, so when replacing a 10mm valve that has an extender it is better to re-use the extender.

AMF with Minarelli: The 1980-83 AMF Roadmaster 140, 141 with Minarelli V1 mid-engine is another model that needs a short extender to position the valve knob to go through the hole in the body panel. This A8 replacement shown in the link fits, but the end of the handle must be ground off.

A8b. 10x1 male spigot left with 20mm extender

1978 Malaguti Pilot original A8b (can use A4)
1980 Pacer Super Sport original A8b (can use A4)

A8b This valve is an A4 plus a C10.195 extender. This configuration was on Malaguti Pilot and Baretta Magum. Can use just A4 without extender.

A8c. 10x1 male spigot right with 20mm extender

A8c 10×1 spigot right
with extender  $29
←res on↓ off→
Italy made by OMG

Links to photos of examples:

1980 Peugeot 102SP original A8c
1980 Peugeot 102SP original A8c

A8c This valve is an A5 plus a C10.195 extender. This configuration was on 1980 Peugeot 102 SP (US model) and others.

Peugeot 102: On 1980 Peugeot 102 there is a wall that prevents the valve from being screwed in, unless there is an extender piece between the valve and the tank. This model must have the extender present.

A7. 10x1 male spigot down with 15mm extender

A7 10×1 spigot down
short 15mm extender
222836 $23 on-off-res
Taiwan-made by F&S

Links to photos of examples:

1987 Tomos A3 Bullet TT
1993 Tomos A35 Bullet TT
1994 Tomos Sprint TT

This valve fits early 1987-93 Tomos top tanks with 10×1 internal threads. After 1993-94 Tomos top tanks have 12×1 external threads and take valve A17b.

The knob has to be removed in order to screw on because the tank wall is too close. Once installed the round knob goes through a one inch hole in the right plastic panel below the tank.

Here it is shown without the metal cup and rubber ring, but those things are included. The 15mm length extension includes the cup and rubber.

A6. 10x1 male spigot back medium shaft

A6 10×1 spigot back
medium shaft
01b1402283b  $15
←reserve  on↓ off→
Italy-made by OMG

NVT original 10×1 back,
long detachable shaft

Links to photos of examples:

1977 NVT Easy Rider
1978 Scorpion SC2
70’s Solex 8000 Tenor (Laura M54)
74-75 Solex Tenor 8000 (Laura M56)

Like the other 10×1 male valves, the whole valve must turn around and around, to screw on. But the long shaft would usually hit something. That would prevent the valve from screwing on. The original valves had a detachable shaft, held on by a clip. So the valve could be installed or removed without the shaft.

This replacement valve does not have an easily detachable shaft. But the shaft can be removed by loosening the shaft nut. To install the valve, remove the shaft, then screw on the valve, tighten only to a little more than “finger tight”, aim it to face outward or whatever direction is best, then replace the shaft. 

A5. 10x1 male spigot right

A5 10×1 spigot right
1b15001017  $15
←res  on↓ off→ 
Italy made by OMG

Links to photos of examples:

1976 Itom Automatic
1978 Safari Super Extra
1978 Pacer Sport (original was A8)
1979-89 Di Blasi R7     #141 on left side
1989-97 Di Blasi R7TB #141 on left side
1996 Di Blasi R7 original

 Any top-tank model, with a 10 x 1 threaded hole on the left side (and nothing nearby) would use this A5 petcock. 

A4. 10x1 male spigot left

A4 10×1 spigot left red
01z2351035  $15
←reserve  on↓ off→,
made in Italy by OMG

A4b 10×1 spigot left
403200  $19
←reserve  on↓ off→,
made in Taiwan by FS

Links to photos of examples:

1977 Motobecane frame A4b replacement
1978 Gitane Sport original
1978 Motobecane frame replacement
1978 Motron Classic A4b replacement
1976 Bianchi Snark original

Any top-tank model, with a 10 x 1 threaded hole on the right side (and nothing nearby) would use this A4 petcock.

Motobecane: This spigot-left valve fits 1970’s sheet-metal-frame Motobecanes, where there is a tight space. It substitutes for the spigot-back original configuration. The fuel hose is routed slightly better than it was with the original valve. See above valve A3.

Cutting the Motobecane side cover to fit an OMG petcock

A3. 10x1 male spigot back

A3 10×1 spigot back
01z2291092  $15
←reserve on↓ off→
made in Italy by OMG

Cutting the Motobecane left side cover to make room for an OMG replacement petcock

Links to photos of examples:
71-73 Broncco Diablo original
1977 Malaguti Commuter original
1977 Malanca Roxi original
1978 Maico original
1978 Malaguti Commuter original
1978 Baretta 38 (and 22) original
1978 Baretta Magnum (top tank)
1978 Motobimm original
1978 Yankee Peddler original
1979 Cosmo Colt original
1979 Motobecane 50V original
1977 MB 50V orig made by Quiet
1980 Cosmo Colt 3 original
1985 Safari 300MT Turbo replacement
1987 Motomarina Raven (monotube)

A3 or A4 for Motobecane: 1970’s sheet-frame Motobecanes use a A3 type vertical valve, but not in a vertical orientation. Instead it is almost horizontal, at about 70 degrees from vertical. So a spigot-back valve fuel hose goes down, not back. An A4 10 x 1 spigot-left is a better replacement choice. With A3 the fuel hose goes down first, and then slightly uphill before it curves down into the Gurtner carburetor. With A4 the fuel hose goes forward first, and then slightly down hill before curving down to the carb. The A4 allows the fuel hose to be empty when the tank is empty. The A3 with a U-shape hose routing would trap some liquid, just like under a sink drain. Then the bike would have to be leaned to the right to empty the fuel hose completely. 

Side cover grinding: With all replacement petcocks the Motobecane 50 or 40 left side cover must be modified. The front side of the petcock slot must be have about 1/8″ (3 mm) cut off.  See the above photo.

A2. 10x1 male spigot down

A2 10×1 spigot down
01z2231010  $15
←reserve on↓ off→
made in Italy by OMG

A2b 10×1 down
red handle  none
←res  on↓ off→

Links to photos of examples:

1965-66 Harley Davidson M50 replacement
1977 Pacer Deluxe (P14) original
1977 Negrini Harvard replacement
1977 Cimatti City Bike (when adapter is missing)
1978 Cimatti City Bike (with no 10-12 adapter)
1978 Motron original (extender on tank)
1978 Concord XKE original
1980 Peugeot 103 LVS replacement
1978 Motobecane Model 7 original
1978 Motobecane Model 7 with A2b

This valve fits hundreds of mopeds and mini-cycles. It fits any tank with a 10×1 threaded hole, and with nothing below or near the valve that would interfere. 

Motobecane 7 rear tanks have a side wall that is very close to the petcock threaded hole. Modern petcocks are too wide to screw in unless they are first disassembled. Once the handle, face cover, nut, spring and shaft-plate are carefully removed, the bare valve body is small enough to screw into the tank. Then the pieces must be put back in the same order and orientation as they came out.

Cimatti rear tanks have a 10×1 threaded hole, but there is a nearby “wall” that prevents a 10×1 male valve from screwing in, unless the whole gas tank is removed. That requires rear wheel and rear fender removal. To make gas valve installation easy, Cimatti added a screw-in 10-to-12 adaptor piece, and used a 12×1 female type gas valve, with a turnbuckle type nut. Only the nut turns, and the “wall” does not matter. So it is much better to reuse the 10-to-12 adaptor, and use a 12×1 spigot right or down valve instead.

A1. 8x1 male spigot L or R push-pull

A1 8×1 push pull
01z2225169  $15
in is on, out is off
Italy-made by OMG

Links to photos of examples:

1960 Wards Riverside original
1965 Motobecane AV79 original