Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 644-11631-03 STD Viewer:1420 OEM No. : 644-11631-03-STD For YAMAHA Outboard 3.5, 5 HP You May Also Be Interested In Piston Kit 689-11631-00 STD Piston Kit 676-11631-00 STD Bearing 310433/0310433 + 378252/0378252 Circlip 09381-20003-000