Yamaha - Gear 2 Assembly Internal Drivetrain Component 6F5-45570-00-00. Overview. The Yamaha Gear 2 Assembly 6F5-45570-00-00 is one of those internal parts that keeps everything turning smoothly behind the scenes. When it starts to wear or develop damage, you'll usually notice it through noise, rough operation, or inconsistent performance. This assembly plays a key role in transferring power through the system, so it needs to stay properly aligned and in good condition. If you're already inside the lower unit or engine, this is one of those parts worth replacing while you've got it apart.. Key Features. • Integrated Gear Assembly - Combines key gear components for smooth and reliable power transfer.. • OEM Fit Precision - Built to Yamaha specifications for proper alignment and gear engagement.. • Smooth Operation Support - Helps reduce friction, vibration, and unwanted noise.. • Durable Load Handling - Designed to withstand continuous torque and marine operating conditions.. Engine & B