Yamaha - Gear 2 - 689-45571-00-00Yamaha Gear 2 Lower Unit Component 689 45571 00 00 Overview The Gear 2 is a critical internal component of your Yamaha outboards lower unit, responsible for transmitting power through the gearcase to support propulsion and gear engagement. It works in conjunction with other gearssuch as the pinion and forward gearto enable smooth shifting and efficient transfer of engine power to the propeller. Precision machined for durability and proper alignment,