Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 644-11631-03 STD Viewer:1397 OEM No. : 644-11631-03-STD For YAMAHA Outboard 3.5, 5 HP You May Also Be Interested In Piston Ring 6E5-11610-00-00 STD Piston Ring 6R5-11603-00-00 STD Gasket 27-832933006/832933006 Fuel Filter 15410-88L00