Yamaha - Balancer assemby - 63P-11500-04-00A smooth running outboard isnt just about powerits about balance. The Yamaha Balancer Assembly (63P 11500 04 00) is designed to reduce internal vibrations, keeping your Yamaha F150 running quietly and efficiently. This updated assembly features composite gears, a major upgrade over older metal designs, providing better durability and reducing mechanical stress on the engine. If your outboard is starting to feel rougher than usual, a worn balancer