Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 662-11631-01 STD Viewer:1199 OEM No. : 662-11631-01-STD For YAMAHA Outboard 9.9, 15 HP You May Also Be Interested In Piston Ring 656-11610-11 0.25 Piston Kit 6R5-11635-01 0.25 Drive Shaft- UL 350-64303-0/350643030M Piston Kit 784-9747A2/9747A 2 STD