Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11631-00/664-11631-01 STD Viewer:1391 OEM No. : 664-11631-00/664-11631-01-STD For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Ring 6J8-11601-21-00 0.50 Piston Kit 64D-11631-00 STD Pin, Straight 90250-05010-00 Power Head Gasket Kit 6H3-W0001-02-00