Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 66T-11631-00 STD Viewer:969 OEM No. : 66T-11631-00-STD For YAMAHA Outboard 40 HP 40X E40 You May Also Be Interested In Piston Kit 6R5-11642-01 STD Piston Pin 6G0-11633-00 Propeller Shaft 44-850308/850308 Piston Kit 700-834800A5/834800A 5 0.010