Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 644-11631-03 STD Viewer:1406 OEM No. : 644-11631-03-STD For YAMAHA Outboard 3.5, 5 HP You May Also Be Interested In Piston Ring 61U-11601-00-00 STD Piston Kit 61A-11635-00 0.25 Piston Kit 679-11635-00 0.25 Carburetor Assembly 6B4-14301-00