Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6H4-11631-01 STD Viewer:473 OEM No. : 6H4-11631-01-STD For YAMAHA Outboard 40, 50 HP You May Also Be Interested In Piston Kit 69L-11646-00 0.50 Piston Ring 61N-11605-00-00 0.50 Oil Seal 3R0-00121-0/3R0001210M Piston Ring 6K5-11601-12-00 0.25