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Harley Davidson Tuneup and Engine Specs
Harley Tune Up Specifications:
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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 Mix Specs for 1963 to 1995 Harley Davidson & Columbia Par Car without oil injection:
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 on 1963 & newer Harley & Columbia.
