Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 66T-11603-00 STD Viewer:723 OEM No. : 66T-11603-00-STD For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Kit 6R5-11631-11 STD Piston Kit 6R5-11635-01 0.25 Piston Ring 12140-94400-050 0.50 Brush Holder Assembly 6E5-81840-10-00