Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 66T-11605-00 0.50 Viewer:830 OEM No. : 66T-11605-00-0.50 For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Kit 6H4-11631-09 STD Piston Ring 689-11610-20-00/689-11610-21-00 0.50 Bearing 93310-727U0 Cylinder Liner Sleeve 326851/0326851