Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 66T-11631-00 STD Viewer:942 OEM No. : 66T-11631-00-STD For YAMAHA Outboard 40 HP 40X E40 You May Also Be Interested In Piston Ring 688-11610-20 0.50 Piston Ring 6R5-11604-00-00 0.25 O-Ring 25-25439/25439 Connecting Rod Kit 336-00040-0/336-00040-1/336000401M