Yamaha - Drive Gear Engine Power Transfer Component 6H4-11536-00-00. Overview. When internal gears start wearing down, it's usually not subtle-you'll hear it and feel it right away. I've worked on engines where a worn drive gear caused everything downstream to run rough or out of sync. This gear is a key part of how power gets transferred through the system, so it has to be spot on. Once it's replaced and set up correctly, the engine runs smoother and a lot quieter.. Key Features. Primary Power Transfer Gear - Transfers rotational force through the engine's internal drivetrain.. Precision Gear Mesh - Designed for smooth engagement to reduce noise and wear.. Hardened Gear Construction - Built to handle high loads and resist long-term wear.. OEM-Spec Fitment - Manufactured to Yamaha tolerances for accurate alignment and operation.. Consistent Performance Support - Helps maintain reliable operation across all engine speeds.. Engine & Boat Compatibility. Designed for Yamaha outboards with