Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 66T-11635-00 0.25 Viewer:952 OEM No. : 66T-11635-00-0.25 For YAMAHA Outboard 40 HP E40 40X You May Also Be Interested In Piston Ring 6H4-11601-00-00 STD Piston Kit 6E3-11631-00-98 STD Fuel Connector-Engine End 22-853736/853736 Gasket, Head 332816/0332816