Over the years, H-D® has made design changes in the cam drive system that compromised strength when output of the engine was increased. There have been many cases of the pinion gear shearing the key and spinning on the shaft, causing the valve train to crash in performance applications. S&S® crankshafts use the earlier, stronger design.

BIG TWINS: In 1990, H-D® eliminated the taper on the pinion shaft that the pinion gear was keyed and pressed to, replacing it with a straight shaft and single key, thus relying on the torque of the pinion gear nut to keep gear in place. S&S® uses the stronger ‘89 & earlier pinion shaft design and components. When installing S&S® crankshafts in ‘90 & later BT engines, order #698-228 Big Twin Pinion Shaft Conversion Kit which includes the correct oil pump drive gear, spacer, end nut & pinion gear (“red” gear supplied unless otherwise specified).

SPORTSTERS: In 1988, H-D® eliminated the splines on the pinion shaft that the pinion and oil pump drive gears were machined to, and replaced it with a straight shaft and key, thus relying on the torque of the pinion gear nut to keep the gear in place. S&S® uses the stronger ‘86-’87 pinion shaft design and components. When installing S&S® crankshafts in ‘88-‘03 XL engines, order #698-328 XL Pinion Shaft Conversion Kit which includes the correct oil pump drive gear, spacer, end nut and pinion gear (“white” gear supplied unless otherwise specified).

Weight 1 lbs
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