237770 Starter Mechanism for 1990 Thru 1999 Big Twin and 1999 Thru

This Rivera Primo starter mechanism is a comprehensive kit designed for use with billet motor plates and standard or aftermarket starter motors. The assembly includes essential components such as the starter shaft bolts, pinion gear, spring, thrust washer, lock plate, extension shaft, and coupler. It is specifically engineered for systems utilizing a 66-tooth ring gear. Rivera Primo is well-regarded for producing robust drivetrain components that handle the high torque requirements of modified Harley-Davidson engines. This kit ensures reliable starter engagement and smooth operation, making it a vital part of a custom primary drive or engine build.