Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6F5-11631-00 STD Viewer:924 OEM No. : 6F5-11631-00-STD For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Ring 6R5-11603-00-00 STD Piston Kit 679-11631-00 STD Pin, Dowel 93605-29098 Needle Bearing 29-88258/88258