Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 66T-11603-00 STD Viewer:713 OEM No. : 66T-11603-00-STD For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Kit 64D-11646-00 0.50 Piston Ring 6R5-11605-00-00 0.50 Needle Bearing 31-8130483/813048 3 Piston Pin 369-00021-0/369000210M