Yamaha - Driven Gear Engine Power Transfer Component 6H4-11537-01-00. Overview. When internal gears start wearing out, you'll usually hear it before anything else-whining, grinding, or just not running as smooth. I've opened up motors where a worn driven gear was the root of the problem, especially on engines that have seen a lot of hours. It's a critical part that keeps everything turning in sync under load. Once it's replaced and set up right, the engine runs quieter and more consistent again.. Key Features. Direct Power Transfer - Transfers rotational force between engine components for proper operation.. Precision Gear Engagement - Designed for smooth meshing to reduce noise and wear.. Hardened Gear Construction - Built to handle torque and resist long-term wear.. OEM-Spec Fitment - Manufactured to Yamaha tolerances for correct alignment and function.. Reliable Internal Operation - Supports consistent performance across varying engine speeds.. Engine & Boat Compatibility. Designed