The OEM 34091-85 inner bearing race has been used on Big Twin since 85. The inner primary bearing rides on this race . By design, this race press-fits onto the transmission mainshaft. This system works fine for stock engines. 100 HP+ engines will make this bearing walk on the mainshaft. If it walks inboard, it will damage the main drive gear seal and cause a transmis - sion oil leak. If it walks outboard, it will cause a primary oil leak. The Baker high torque bearing kit eliminates this condition. Kit includes a precision honed bearing and seal.
NoteFits Harley-Davidson Big Twin '84-'06 models.