Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 66T-11631-00 STD Viewer:950 OEM No. : 66T-11631-00-STD For YAMAHA Outboard 40 HP 40X E40 You May Also Be Interested In Piston Kit 676-11631-60 STD Piston Kit 64D-11642-00 STD Clutch 52-812946003/812946003 Gear 68V-45571-00-00(28T)