Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 66T-11603-00 STD Viewer:711 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 682-11610-00-00/682-11610-01-00 STD Carburetor Repair Kit 6H0-W0093-00-00 Water Pump Impeller Kit 06192-ZV4-000