Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11636-00 0.50 Viewer:1386 OEM No. : 664-11636-00-0.50 For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Ring 6K5-11601-02-00 STD Piston Ring 647-11610-00-00 STD Roller Bearing 31-43013A1/43013A 1 Tube, Water 63V-44361-11-00