Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 66T-11605-00 0.50 Viewer:839 OEM No. : 66T-11605-00-0.50 For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Pin 663-11633-00-00 Piston Kit 6H3-11635-01 0.25 Water Pump Plate 17471-98610 Joint, Link 6R5-41237-00-00