Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11631-00/664-11631-01 STD Viewer:1344 OEM No. : 664-11631-00/664-11631-01-STD For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Ring 675-11610-10 0.25 Piston Pin 677-11633-00-00 Seal, Upper 318451/0318451 Piston Ring 12140-93302 STD