Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 644-11631-03 STD Viewer:1398 OEM No. : 644-11631-03-STD For YAMAHA Outboard 3.5, 5 HP You May Also Be Interested In Piston Kit 677-11631-00-97 STD Piston Kit 6F6-11635-00 0.25 Gasket, Upper Pump Case 369-65020-0/369650200M Power Head Gasket Kit 436891/0436891