Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6F5-11631-00 STD Viewer:946 OEM No. : 6F5-11631-00-STD For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Ring 6J1-11610-00-00 STD Piston Pin 6E7-11633-00 Piston Kit 12110-93111-050 0.50 Roller Bearing Assembly 31-42943A1/42943A 1