Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 669-11631-00 STD Viewer:1339 OEM No. : 669-11631-00-STD For YAMAHA Outboard 9.9, 15 HP You May Also Be Interested In Piston Ring 647-11610-10 0.25 Piston 6L2-11635-00-00 0.25 Ball Bearing 30-884329T/884329T Piston Kit 61A-11631-02 STD