Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11631-00/664-11631-01 STD Viewer:1412 OEM No. : 664-11631-00/664-11631-01-STD For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Kit 676-11635-00 0.25 Piston Ring 6J1-11610-00-00 STD Connecting Rod 395861/0395861 Gear, Forward 679-45560-00(26T)