Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 66T-11631-00 STD Viewer:941 OEM No. : 66T-11631-00-STD For YAMAHA Outboard 40 HP 40X E40 You May Also Be Interested In Piston Kit 6G0-11636-00 0.50 Piston Kit 6R5-11631-11 STD O-Ring 25-823683/823683 Cover, Water Inlet 6P2-45225-00-00