Yamaha - Driven Gear Internal Engine Gear System 6AH-11537-00-00. Overview. Inside the engine, this driven gear is part of what keeps everything turning in sync. When it's in good shape, the motor runs smooth and quiet without any extra noise or vibration. But once wear starts or teeth get damaged, you'll hear it-and it usually doesn't take long to get worse. It's one of those internal parts that has to be right if you want the engine to keep running strong.. Key Features. Consistent Gear Engagement - Transfers motion smoothly between internal engine components.. Precision Tooth Profile - Designed for proper meshing to reduce noise and uneven wear.. High-Strength Construction - Built to handle continuous rotation and engine load.. OEM Fitment Accuracy - Matches Yamaha specifications for correct alignment and performance.. Engine & Boat Compatibility. Designed for Yamaha outboard engines utilizing this driven gear within internal gear systems. Commonly used across modern Yamaha applicat