Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 66T-11605-00 0.50 Viewer:838 OEM No. : 66T-11605-00-0.50 For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Pin 677-11633-00-00 Piston Kit 6E7-11635-00-00 0.25 Check Valve Assembly 688-11370-00-00/688-11370-01-00 Impeller 3B2-65021-1/3B2650211M/3B2-65021-0/3B2650210M