Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 66T-11635-00 0.25 Viewer:954 OEM No. : 66T-11635-00-0.25 For YAMAHA Outboard 40 HP E40 40X You May Also Be Interested In Piston Kit 6E7-11631-00-97 STD Piston Kit 6R5-11635-01 0.25 Gasket, Cylinder Head 346-01005-0/346010050M Bearing 93341-930V2-00