Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 669-11631-00 STD Viewer:1259 OEM No. : 669-11631-00-STD For YAMAHA Outboard 9.9, 15 HP You May Also Be Interested In Piston Ring 675-11610-00 STD Piston Kit 6H1-11635-03 0.25 Pad, Transom clamp 648-43114-01-00 Shim 676-45587-00-75