Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 66T-11603-00 STD Viewer:735 OEM No. : 66T-11603-00-STD For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Kit 69L-11645-00 0.25 Piston Kit 688-11635-02 0.25 Gasket, Cylinder Head 688-11181-A0-00/688-11181-A1-00 Crank Sub Asy 2 6K5-11402-00-00