Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6F5-11631-00 STD Viewer:923 OEM No. : 6F5-11631-00-STD For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Ring 61U-11601-10-00 0.25 Piston Kit 6L1-11642-01 STD Cotter Pin 18-469501/469501 CD Unit 803704