Yamaha - Gear - 68V-45571-00-00Yamaha Gear 68V 45571 00 00 Overview This gear is a key internal component inside your Yamaha outboards lower unit, responsible for engaging propulsion when shifting into reverse. When this gear becomes worn or damaged, you may notice grinding, slipping, or difficulty backing the boat. Replacing it restores smooth shifting and dependable reverse operation, helping maintain full control of your outboard in tight maneuvering situations like docking or