Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 66T-11605-00 0.50 Viewer:824 OEM No. : 66T-11605-00-0.50 For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Ring 688-11603-A0-00 STD Piston Kit 6R5-11636-11 0.50 Circlip, Inner 93450-15023-00 Coil Ignition 6F6-85530-01-00