Piston (Std) Set for Yamaha Boat Engine 4 Stroke F20 6AH-11631-00 Pinton Ring
For Outboard: Yamaha F20. New parts Piston (Std), Yamaha, 6AH-11631-00 is used. Piston Ring Set (Std):6AH-11603-00-00. Piston (Std):6AH-11631-00. This can be for any of the following reasons -. Manufacturer Part Number.