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Harley Davidson Tuneup and Engine Specs

Harley Tune Up Specifications:

Print It And Go

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Point Gap for 1963 to 1981 = .022"-.024

Point Gap for 1982 to 1985 = .015"-.016"

Spark Plug Gap:

1963 to 1970 = .040"

1971 to 1981 = .025"

1982 to 1985 = .040"

1986 to 1989 = .025"

1990 to 1995 = .035"

1996 to 2004 = .030"


Harley Davidson Engine Specifications for 1963 to 1981 two cycle engine:

Cylinder to Piston Clearance measured 3/8" below bottom ring land = .006" to .007"

Piston Ring End Gap = .007" -.017"

Piston Diameter is approximately 2.739"

IMPORTANT NOTE: Always bore cylinder with the piston on hand to insure a proper fit due to piston diameter inconsistencies.


Torque Specs:

Cylinder Head Bolts:17-21 ft/lbs (2.4-3.0 kgm)

Crankcase Bolts: 9-11 ft/lbs (1.3-1.5 kgm)

Axle Nut, 1976 and older: 50 ft/lbs (7.0 kgm)

Axle Nut, 1977 and newer: 100 ft/lbs (14 kgm)

Primary Clutch Nut, 1963 to 1981: 75-80 ft/lbs (11 kgm)


Oil Specs:

Use 1.5 ounces of any good quality two stroke oil to one gallon of gas.

Clutch on 1963 to 1981 uses 12 ounces of 75/90 wt. gear lube.

Use 75/90 wt in the differential.


Harley Davidson Engine Specifications for 1996 & newer B&S Vanguard four cycle engine:

Tune-up & Engine Specs for 9hp

Bore and Stroke: 3.15 in. (80 mm) x 2.32 in. (59 mm)
Displacement: 18.5 cu. in. (296 cm3)
Cylinder Head Torque: 300 in/lbs (33.9Nm)
Rod Torque: 175 in/lbs (19.8Nm)
Spark Plug Gap: .030 in. (.76 mm)
Intake & Exhaust Valve Lash: .002"-.004" (.05-.10mm)


Tune-up & Engine Specs for 13hp

Bore and Stroke: 3.50 in. (89 mm) x 2.48 in. (63 mm)
Displacement: 24.4 cu. in. (391 cm3)
Cylinder Head Torque: 35 ft/lbs (47.5Nm)
Rod Torque: 175 in/lbs (19.8Nm)
Spark Plug Gap: .030 in. (.76 mm)
Magneto Armature Coil Gap:.012" (.31 mm) to.020" (.51 mm)
Intake & Exhaust Valve Lash: .004"-.006" (.10-.15mm)

Tire Pressure

18 x 8.5 x 8 tires: Check pressure and inflate to 18 psi (1.2 atm)
5.70 x 8 tires: Check pressure and inflate to 50 psi (3.4 atm)
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