Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 66T-11605-00 0.50 Viewer:849 OEM No. : 66T-11605-00-0.50 For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Ring 6E5-11610-10 0.25 Piston Kit 6H3-11636-01 0.50 Impeller 47-888689/888689 Gasket, Pump Cover 369-03302-0/369033020M