S&S Cycle

High quality S&S pinion gears are carefully machined, heat treated and then finish ground. Three distinct year groups, in up to eight different color coded sizes for optimum gear lash, are available for big twin engines. S&S color codes match Harley-Davidson® color codes so that replacement is easy. Just pick the appropriate color S&S gear that matches the color on the damaged stock gear (see notes). NOTES: If the stock gear is unmarked and the size is unknown or you are scratch building an engine and have no gear, we recommend that you order a gear in the middle of the size range. These sizes were used more often and should provide adequate gear clearance under most circumstances. When in doubt, use a gear from the middle to the small side of the range, because a combination of looser fitting smaller gears is less likely to cause binding and premature wear. Consult the chart for the size and appropriate part number required. If you wish to achieve optimum cam gear to pinion gear fit, consult your factory service manual for instructions on fitting these gears before making a selection. Some sizes, particularly those on and near the ends of each range, are available on a limited basis because they are the extremes. REPLACEMENT PINION GEARS

Mid 1954–’77

Early 1939–’53

Late 1977–’99

BIG TWIN STYLE PINION GEAR SELECTION CHART 1939–'53

1954–'77

1977–'89*

Color Code Part #

Color Code Part #

Color Code Part #

–

Orange

Orange

Orange

33-4121 USA 33-4122 USA 33-4123 USA 33-4124 USA 33-4125 USA 33-4126 USA 33-4127 USA 33-4128 USA

33-4141 USA 33-4142 USA

Biggest

Black

Black

White

33-4102 USA

–

Red

Red

Yellow

33-4143 USA USA 3 33-4144 USA USA 1

Blue

Blue

Red

33-4104 USA

Average

– – – –

Green

Green

Blue

33-4145 USA 33-4146 USA 33-4147 USA

– – –

White

Green

Smallest

Brown

Black

–

–

Yellow

Note: All S&S Pinion Shaft Gear Kits must be used with 1973–’99 style 24-tooth oil pump drive shaft gear such as S&S part #33-4230. *Use this kit when installing an S&S flywheel assembly in a 1990–’99 engine.

136 S&S Vintage 1926–1999 Order 608-627-1497