Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 66T-11635-00 0.25 Viewer:958 OEM No. : 66T-11635-00-0.25 For YAMAHA Outboard 40 HP E40 40X You May Also Be Interested In Piston Kit 6D0-11646-00 0.50 Piston Ring 6R5-11605-00-00 0.50 Piston Kit 12110-94300-050 0.50 Water Pump Plate Gasket 17472-87D10