Eastern Motorcycle Parts Bearing — mainshaft replacement for 5-speed Big Twins

This bearing is a direct replacement mainshaft bearing engineered for 5-speed Big Twins. It restores smooth mainshaft rotation, reduces end play, and helps maintain reliable shifting under load. Designed for rebuilds and repairs, the bearing meets tight tolerances to ensure consistent performance and long service life.

For best results, clean mating surfaces, inspect the shaft and housing for wear, and use proper press tools and recommended lubricants during installation. Routine inspection and correct installation extend drivetrain life and improve shift feel.