Engine Specifications

VALVES (3B)

Spring (FL)

70 - 80 lbs. at 29/32 in. (open) Free length 1-15/32 in.

Spring (FLH)

Free length 1-31/32 in.

70 - 80 lbs. at 51/64 in. (open) Free length 1-23/64 in.

Tappet adjustment Hydraulic tappet unit compressed 1/8 in. from fully extended position.

TAPPETS (3D)

Guide fit 002 tight - .002 loose

Roller end clearance 008 - .010 in.

GEARCASE (3D)

Timer gear end play 003 - .007 in.

Idler gear end play 003 - .007 in.

Breather gear end play 001 - .005 in.

Cam gear shaft in bushing 001 - .0015 in.

Intermediate and idler gear

Oil pump drive shaft

(crankcase bushing) 0008 - .0012 in.

FLYWHEEL ASSEMBLY (3E)

Runout (flywheels) 003 in. maximum at rim

Runout (mainshafts) 001 in. maximum

ROCKER ARM (3B)

Fit in bushing 001 - .002 in. loose

End clearance 004 - .012 in.

PISTON (3C)

Fit in cylinder 001 - .002 in. loose

Ring gap (compression) 010 - .020 in.

Ring side clearance 004 - .005 in.

Oil ring (Rail Type)

Side clearance 0035 - .008 in.

Oil ring overlap (U-Flex) 11/32 in.

Piston pin fit Light hand press at 70° F.

CONNECTING ROD (3C)

Piston pin fit 0008 - .0012 in. loose

End play between flywheels 006 - .010 in.

Fit on crankpin 001 - .0015 in. loose

OIL PUMP PRESSURE (3D)

(20 MPH) 25 lbs./sq. in. (30 MPH) 35 lbs./sq. in. (60 MPH) 35 lbs./sq. in. (90 MPH) 35 lbs./sq. in.

IGNITION TIMING (3D)

Breaker point setting 022 in. gap

SPROCKET SHAFT BEARING (3E)

Cup fit in crankcase 0015 - .0035 in. press

Cone fit on shaft 0002 - .0015 in. press

PINION SHAFT BEARINGS (3E)

Roller bearing fit 0005 - .001 in. loose

Cover bushing fit 0005 - .0012 in. loose

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