Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 644-11631-03 STD Viewer:1377 OEM No. : 644-11631-03-STD For YAMAHA Outboard 3.5, 5 HP You May Also Be Interested In Piston Kit 6H4-11635-01 0.25 Piston Ring 6K5-11601-02-00 STD Piston Kit 682-11636-00 0.50 Gear, Forward 57510-94401-000/57510-94402-000(23T)