updated 2024-05
Indian AMI-50 Chief Engine Parts
Contents:
1. Cylinder and Head
1a. Carburetor
2. Clutch and Cover
3. Valves and Cam
4. Transmission
5. Piston and Crank
6. Case and Magneto
The 1978 Parts Book has better illustrations than the later ones. So the 1978 pictures are used here. There are no suffixes a, b, c, etc on any item numbers. So there was only one version of every part. There was no carburetor parts section (Tillotson).
The 1979 Parts Book had some parts that came in two versions. They had an A or B after the item number, such as the carb, intake pipe, fork, fork lock and battery. Some of the 1978 item numbers changed in the 1979 and later parts manuals. There was no carburetor parts section (Tillotson or Keihin).
The 07-1979 Parts Book had some parts that came in three versions. They had an A B or C after the item number, such as the carb, intake pipe and magneto. There was no carburetor parts section (Tillotson, Keihin or Mikuni). The page numbers were 1 to 36.
The 1980 Parts Book had some parts that came in four versions. They had an A B C or D after the item number, such as intake pipe. There was no carburetor parts section (Tillotson, Keihin or Mikuni). The page numbers were 1 to 36?
The 06-1981 Parts Supplement had the Keihin and Mikuni parts, the 79-later 2-coil magneto, and Mira mag wheel parts sections. The page numbers were 37 to 42. So it was a continuation of the previous books. It was a stack of pages to be inserted into the back of any parts manual.
Indian AMI-50 with Keihin PA-MOA carb
1. Cylinder and Head
OHV: This type is over head valve OHV, not over head cam OHC. Head or piston replacement is easier on OHV than on OHC, because the cam and cam chain are in the bottom, out of the way.
Heads: Indians have 2 types of cast iron cylinder heads, #3 black ’78-80 and 3d silver ’80-81. Head #3 has 33mm intake bolt spacing, while 3d has 35mm. Head 3d has a more side-facing flange angle. Head 3d has valve stem seals. Head 3 did not.
Pipes: Indians have 4 types of intake pipes, 4a, 4b, 4c, 4d. The first 3 are for head #3, and so have a 33mm lower bolt hole spacing. Pipe 4d is for head 3d, and so has a 35mm lower bolt hole spacing.
1. Cylinder and Head
# qty price Indian part# description
u00 1 $45.0 E000-00-50 engine gasket set
u01 1 $155 E110-00-50 cylinder new 0.007″gap
01u 1 $50.0 E110-00-50 cylinder used 0.018″gap
u02 1 $7.00 E910-00-50 cylinder base gasket
u03 1 $140. E120-00-50 head early black bare new
03u 1 $70.0 E120-00-50 head early black bare used
03d 1 none E120-50-50 head late silver bare new
04a 1 $48.0 E220-00-50 intake ’78 Tillotson 6×33 5×31
04b 1 none E220-20-50 intake 78-80 Keihin 6×33 6×32
04c 1 none E220-30-50 intake 78-80 Mikuni 6×33 ∅18
04d 1 $57.0 E220-50-50 intake 80-81 Mikuni 6×35 ∅18
04e 1 none E220-40-50 intake 80-81 Keihin 6×35 6×32
u05 1 $25.0 E911-00-50 cylinder head gasket
u06 1 $29.0 E130-00-50 valve cover bare
06u 1 $29.0 E130-00-50 valve cover assy used
u08 1 $17.0 E912-00-50 valve cover gasket
u09 1 $16.0 E160-00-50 decomp shaft/lever
u10 1 $9.00 E162-00-50 decomp shaft spring
u11 1 $8.00 E161-00-50 decomp bracket
12a 1 $14.0 E230-00-50 insulator Tillot. ∅5 x 31
12b 1 $21.0 E230-20-50 insulator Keihin ∅6 x 32
13a 2 none E920-00-50 i. gasket use 13b ∅5 x 31
13b 2 $2.50 E920-20-50 int. pipe gasket ∅6 x 32
13c 1 $4.00 E920-30-50 int. head gasket ∅6 x 33
13d 1 $4.00 E920-50-50 int. head gasket ∅6 x 35
13c 1 $4.00 13c, 13d are 13b with holes widened
13d 1 $4.00 by using a 1-hole paper punch ∅6
u14 1 $0.20 H106-00-50 washer M6
15a 1 none E163-00-50 circlip decomp 7mm
15b 1 $2.00 E163-10-50 substitute 6mm widened
u16 1 $3.00 E164-11-50 o-ring ∅1.5 x 5 (8 od)
u17 1 $1.00 H462-00-50 hex bolt M6 x 20
u18 2 $1.20 H467-10-50 hex bolt M6 x 71(70)
u19 1 $2.50 H461-00-50 hex bolt M6 x 100
u20 1 $2.50 H461-12-50 hex bolt M6x112(110)
u21 1 $1.00 H462-80-50 hex bolt M6 x 28(30)
u22 1 $1.00 H463-20-50 hex bolt M6 x 32(30)
u23 1 $1.20 H465-60-50 hex bolt M6 x 56(55)
u24 2 $2.00 H563-00-50 exhaust stud M6
25a 2 $2.00 H662-00-50 carb screw for Til. M5 x 55?
25b 2 $0.80 H662-20-50 carb screw for Kei. M6 x 20
26a 2 $1.00 H662-50-50 intake screw Til. M6 x 25
26b 2 $1.00 H662-20-50 intake screw Kei M6 x 20
u27 2 $3.00 E532-00-50 knock pin 8 x 12
Indian gasket set
Indian intake gaskets and heads
Black early head #3 for all three carbs.
Intake flange faces more back. Here with pipe #4a and Tillotson carb.
Black early head #3 for all three carbs.
Intake flange faces more back. Here with pipe #4b and Keihin carb.
Black early head #3 for all three carbs.
Intake flange faces more back. Here with pipe #4c and Mikuni carb.
Silver late head #3d for Mikuni carburetor.
Intake flange faces less back. Requires pipe #4d and Mikuni carb.
1a. Carburetor
Some 1978 Indians had a Tillotson “no-float” (12mm) carb, with choke lever on carb.
Some 1978, most 1979 had a Keihin PA-MOA (10mm) carb, with choke lever on carb.
Some ’79 and ’80, all 1981 had a Mikuni H9-10 (10mm) carb, choke lever on handlebar.
Tillotson Carburetor Parts (none)
Info on parts and service is now offered in the Carburetor/Mikuni and Tillotson section.
Keihin Carburetor Parts
Most Keihin carburetor parts for Indian are now offered in the Carburetor/Keihin section.
Mikuni Carburetor Parts
Some Mikuni carburetor parts for Indian are now offered in Carburetor/Mikuni and Tillotson.
2. Cover and Clutch
2. Cover and Clutch photo courtesy of cmsnl.com
# qty price Indian part# description
u01 1 none E511-00-50 right case cover
u02 1 $10.0 E930-00-50 clutch cover gasket
u03 1 $3.00 E314-00-50 sprocket distance collar
u04 1 $10.0 E537-00-50 dip stick
u05 1 $65.0 E310-00-50 drum & drive gear ??T
u06 1 $7.00 E315-00-50 clutch center guide
u07 1 none E312-00-50 starter friction plate
u08 1 none E313-00-50 clutch assembly
u8a 2 $6.00 E313-10-50 clutch spring
u8b 2 $1.50 E313-20-50 clutch e-clip 6mm
u8c 2 none E313-30-50 clutch shoe
u8d 1 none E313-40-50 clutch hub
u09 1 $12.0 E311-00-50 ball retainer
u10 1 none T108-54-50 driven gear 54T
u11 1 none T117-00-50 engage slider shaft
u12 1 none E534-00-50 engage lever knob
u13 1 $2.00 H214-00-50 clutch nut M14x1
u14 1 $3.00 H114-00-50 lock washer M14 spec
u15 1 $7.00 H117-00-50 thrust washer 17.1-22.8-1.0
u16 1 none E153-00-50 engage washer 5 x 30
u17 3 $0.50 E316-00-50 starter balls Ø7.9 = 5/16″
u18 1 $5.00 E535-00-50 engage shaft seal 5x30x6
u19 1 $1.00 E536-00-50 dip stick o-ring
u20 2 $0.80 H662-00-50 phillips bolt M6 x 20
u21 2 $1.00 H662-50-50 phillips bolt M6 x 25
u22 1 $1.00 H663-20-50 phillips bolt M6 x 32(30)
u23 5 $1.00 H667-50-50 phillips bolt M6 x 75
u24 1 $1.20 H668-50-56 phillips bolt M6 x 85
u25 2 $3.00 E532-00-50 knock pin 8 x 12
1. Trans, clutch, cam parts 2. Clutch Parts
3. Valves and Camshaft
3. Valves and Cam
# qty price Indian part# description
u01 1 none E405-00-50 oil pump bush 17.5mm
u02 2 none E406-00-50 set plate for bush
u03 1 $55.0 E401-00-50 cam w/sprocket 30T
u05 1 $16.0 E403-00-50 cam chain #25 x 42L
u06 2 none E416-00-50 push rod ∅4.5 x 139
u07 2 $7.00 E417-00-50 rocker arm
u08 2 $5.00 E418-00-50 rocker arm pivot
u09 1 none E404-00-50 chain tensioner
u10 1 none E407-00-50 tensioner spring
u11 1 $15.0 E410-11-50 int. valve (same as ex)
11a 1 $17.0 14711-081-020 Honda int. valve
u12 1 $22.0 E410-12-50 ex. valve (same as in)
12a 1 $25.0 14721-081-020 Honda ex. valve
u13 2 $8.00 E411-00-50 lifter
u14 2 $8.00 E412-00-50 valve spring
u15 2 $2.00 E413-00-50 valve spring retainer
u16 4 none E414-00-50 valve keeper (cotter)
u17 1 none E415-00-50 push rod guide plate
u18 1 none E430-00-50 oil pump inner rotor
u19 1 none E431-00-50 oil pump outer rotor
u20 1 none E432-00-50 oil pump shaft A
u21 1 none E433-00-50 oil pump shaft B
u22 2 $5.00 E419-00-50 rocker bolt M6-0.50
u23 2 $8.00 E420-00-50 lock nut M6-0.50 x 4
u24 1 $0.20 H106-00-50 washer M6
u25 1 none E434-00-50 oil pump washer
u26 1 $2.00 H161-70-50 wide washer M6 x 17
u27 1 $0.80 H661-20-50 phillips bolt M6 x 12
u28 2 none H661-40-50 phillips bolt M6 x 14
u29 1 $0.80 H661-50-50 phillips bolt M6 x 16
u30 1 $4.00 A610-23-50 spark plug NGK C7HSA
u30 1 $4.00 A610-23-60 hotter plug NGK C6HSA
u31 2 $7.00 E511-00-50 valve seal only for head 3d
u32 2 $7.00 E510-00-50 seal cup only for head 3d
1. Head #3d with seals 2. Head and valve parts
Valve seals are for #3d head only
No valve guides: Both the head #3 ’78-80 and the head #3d ’80-81 have no replaceable valve guides, just precision holes and spring seats cut into the solid cast iron. When the holes get worn the whole head has to be replaced.
No valve seals: Head #3 did not have valve seals #31 or cups #32. It had no facility for holding valve seals. Indian engines with un-worn valve stem holes do not need seals. Indian’s mid-70’s relatives Honda PF50 and QR50 did not have them. But old engines with worn valve holes do need seals. Oil creeps down the valve stem, and is then burned. Burned 4-stroke oil smells, smokes, and blackens spark plugs.
Valve seals: Only the later ’80-81 head #3d had valve seals. The built-in valve guides outer diameter was reduced from 9.9 to 9.0 mm to allow a thin seal cup to fit inside the lower end of the 10.0 mm ID valve spring.
4. Transmission Shafts
4. Transmission shafts
# qty price Indian part# description
u01 1 none T101-00-50 main shaft
u02 1 none T102-00-50 counter shaft
u03 1 $19.0 T110-15-50 sprocket 15T used
03a 1 $24.0 T110-16-50 bigger sprocket 16T
03b 1 $140 T110-14-50 smaller sprocket 14T
03c 1 none T110-11-50 smallest sprocket 11T
u04 1 none T103-00-50 engage push pin
u05 1 none T104-00-50 engage coil spring
u06 1 $15.0 T111-29-50 pedal ratchet sprocket
u07 1 $40.0 T105-00-50 pedal shaft
u09 2 $4.00 T106-00-50 pedal ratchet pawl
u10 2 $4.00 T107-00-50 pawl spring
u11 2 $7.00 H117-00-50 thrust washer 17.1-22.8-1.0
u12 1 $2.00 H115-00-50 push pin disk Ø14.8 x 1.7
u13 4 $1.50 H120-00-50 pedal washer Ø20 x 30?
u14 3 none T114-00-50 seal 20x30x6
u14 3 $6.50 T114-subst. seal 20x30x5
u15 5 $1.00 T115-10-50 circlip (snap ring) 20-outer
u16 1 $1.00 T115-20-50 circlip (snap ring) 10-inner
u17 1 $8.00 T116-00-50 bearing 6004, 20x42x12
White ratchet “springs” and trans parts.
Indian pedal ratchet pawl springs, early spring steel leaf type, often broke. That caused the pedals to freewheel both ways, but the engine could still be push-started. The upgrade springs for 1979-later were silicone rubber. The good thing is those never break. The bad thing is the pedal chain and ratcheting sprocket are trapped in the center of the engine cases, and cannot be serviced without engine removal and complete disassembling, with splitting of the crankcases.
Indian front sprockets fit on many small Honda models, like early Honda 90, but not early Honda 50. They have 6 splines, 17mm inner by 20mm outer diameter. A normal Indian goes 27mph with a 15 tooth. With more power it could go 29mph with a 16T. With less power, or with quicker take-off, it could go 25mph with a 14T.
5. Piston and Crankshaft
5. Piston and crankshaft
# qty price Indian part# description
u01 1 none E600-00-50 crankshaft complete
u02 1 $39.0 E660-00-50 ring set std 42.00
02a 1 $39.0 E660-10-50 ring set 1os 42.25
02b 1 none E660-20-50 ring set 2os 42.50
02c 1 none E660-30-50 ring set 3os 42.75
02d 1 none E660-40-50 ring set 4os 43.00
u03 1 $48.0 E650-00-50 pist bare std 42.00
03a 1 $48.0 E650-10-50 pist bare 1os 42.25
03b 1 none E650-20-50 pist bare 2os 42.50
03c 1 none E650-30-50 pist bare 3os 42.75
03d 1 none E650-40-50 pist bare 4os 43.00
03x 1 none 6131 piston complete std 42.00
3xa 1 none 6132 piston complete 1os 42.25
3xb 1 none 6133 piston complete 2os 42.50
3xc 1 none 6134 piston complete 3os 42.75
3xd 1 none 6135 piston complete 4os 43.00
u04 1 $12.0 E651-00-50 piston pin ∅13 x 33
u05 2 $2.00 E652-00-50 piston pin clip ∅13
u06 1 none E601-00-50 con. rod w/pin
u07 1 none E602-00-50 roller retainer cage
u08 1 none E603-10-50 right half of crank
u09 1 none E603-20-50 left half of crank
u10 1 none E604-00-50 crank pin
u11 1 $12.0 E610-15-50 timing sprocket 15T
u12 1 none E605-00-50 sprocket pin ∅? x ?
u13 1 $7.00 E606-00-50 flywheel key 3x4.6×12.2
u14 20 none E607-00-50 rod bearing roller 2.5×8.5
u15 1 $7.00 E611-00-50 L crank seal 15x25x6
u16 1 $10.0 E608-00-50 L bearing 6202 15x35x11
u17 1 $6.00 E609-00-50 R bearing 6203 17x40x12
Cylinder, piston, rings
6. Case and AC generator
There were two types, made in Taiwan by WTEMCO.
1978-79 had a 3-wire, 4-coil (3 for lights, 1 for ignition)
1980-81 had a 3-wire, 2-coil (1 for lights, 1 for ignition)
6. Case and Dynamo
# qty price Indian part# description
u01 1 none E512-00-50 right case half
u02 1 $6.00 E931-00-50 case center gasket
u03 1 none E513-00-50 left case half
u04 1 none E521-00-50 dynamo cover maybe Sachs?
u05 1 $14.0 D110-00-50 3-piece points M19A
u06 1 none D111-00-50 felt wiper
u07 1 $1.20 D112-00-50 points screw M4x10 phillips
u08 1 $0.20 D113-00-50 lock washer M4
u09 1 $0.20 D114-00-50 washer M4
u10 1 none D115-00-50 ignition coil 4C blue
10a 1 none D115-10-50 ignition coil 2C blue
u11 1 none D120-00-50 magneto 4C (4-coil)
11a 1 $240 D120-10-50 magneto 2C (2-coil)
11b 1 $120 D120-stator stator assy WTEMCO
u12 1 $140 D117-00-50 flywheel WTEMCO
u13 1 none D116-00-50 ltg coils (3) 4C lt grn+yel
13a 1 none D116-10-50 lighting coil 2C lt grn+yel
u14 1 none D118-00-50 rubber grommet
u15 1 none D119-00-50 clamp for cord
u16 1 none E538-00-50 sealing bolt M8x15
u17 1 $2.00 H210-00-50 flywheel nut M10-1.25
u18 1 $1.00 E553-00-50 seal washer M12
u19 1 $0.20 H000-00-50 washer M8
u20 1 $1.00 D121-00-50 flywheel washer 10x?
u21 1 $5.00 E531-00-50 drain plug M12-1.5×15
u22 4 $0.50 H000-00-50 coil bolt M4 x 22(23) slot
u23 3 $1.20 H000-00-50 case bolt M6x36(35) phil
u24 1 $1.40 H000-00-50 case bolt M6 x 45 phil
u25 4 $3.00 E532-00-50 knock pin 8 x 12mm
u26 1 none D122-00-50 back plate for 4-coil
26a 1 none E122-00-50 back plate for 2-coil
u27 1 $12.0 H000-00-50 condenser M36
u28 3 $0.80 H000-00-50 stator screws M4x15
Magneto and ignition parts
Indian 4-coil Magneto
Indian 2-coil Magneto
The WTEMCO magneto is similar to a 90mm Bosch magneto, like on Puch mopeds. The points, condenser are Bosch compatible. The original points are the older style 3-piece kind, identified by the e-clip. By removing the screw-in post, newer style one-piece Bosch points will replace the older 3-piece ones. The WTEMCO flywheel timing angle is close to Tomos, which is different than Puch.