Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 66T-11603-00 STD Viewer:725 OEM No. : 66T-11603-00-STD For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Kit 6R5-11635-11 0.25 Piston Ring 664-11610-10 0.25 O-Ring 93210-69MG6-00 Propeller 58100-93723-019