Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 669-11631-00 STD Viewer:1254 OEM No. : 669-11631-00-STD For YAMAHA Outboard 9.9, 15 HP You May Also Be Interested In Piston Kit 644-11631-03 STD Piston Ring 61U-11601-20 0.50 Gasket 27-161583/161583 Bearing 350-60211-0/350602110M