722937 Spline Shaft 1965 1984 Kick Electric Start Short Primary Wit

The Rivera Primo Brute II Extreme belt drive is a heavy-duty solution for riders looking to upgrade their primary drive while keeping everything enclosed. This kit features a 1 1/2 inch wide, 11mm pitch Kevlar polychain belt, designed to handle high-torque loads within aluminum or stamped steel primary covers. It fits a wide range of Big Twin and FX models, with specific configurations for 1936 to 1964 models using tapered or splined shafts, and 1965 to 1984 models with kick or electric start options. These kits are compatible with OEM style or aftermarket dry clutches. Whether you're running a 33/49 or 34/49 tooth pulley setup, this belt drive provides a quiet, efficient, and extremely durable alternative to a traditional primary chain.