Yamaha - Gear Internal Engine Component 6FM-45571-00-00. Overview. The Yamaha Gear 6FM-45571-00-00 is one of those internal parts that keeps everything turning the way it should. When a gear starts to wear or chip, you'll usually hear it first-extra noise or rough operation that wasn't there before. It plays a key role in transferring motion between components, so it needs to stay precise and properly aligned. If you're already inside the engine or lower unit, this is one of those parts worth replacing to avoid bigger issues later.. Key Features. • Reliable Power Transfer - Moves rotational force between components for smooth operation.. • OEM Fit Precision - Built to Yamaha specifications for proper meshing and alignment.. • Smooth Gear Engagement - Helps reduce friction and unwanted noise during operation.. • Durable Load Handling - Designed to withstand continuous use, torque, and engine stress.. Compatibility. Compatible with select Yamaha outboard engines using this gear configura