Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11631-00/664-11631-01 STD Viewer:1392 OEM No. : 664-11631-00/664-11631-01-STD For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Kit 64D-11635-00 0.25 Piston Kit 6G5-11646-00 0.50 Gasket, Valve Seat 6H3-13622-A1-00 Clip 663-14159-00-00