Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 669-11631-00 STD Viewer:1231 OEM No. : 669-11631-00-STD For YAMAHA Outboard 9.9, 15 HP You May Also Be Interested In Piston Kit 64D-11642-00 STD Piston Kit 6H3-11636-01 0.50 Piston Pin 6H3-11633-00-00 Gasket, Head Cover 6G5-11193-A0-00