Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11636-00 0.50 Viewer:1358 OEM No. : 664-11636-00-0.50 For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Pin 6R5-11633-00 Piston Ring 64D-11605-00-00 0.50 Gasket 27-855555/855555 Bearing 93311-632U1-00/93311-63223