Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11635-00 0.25 Viewer:1328 OEM No. : 664-11635-00-0.25 For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Kit 61A-11635-00 0.25 Piston Kit 6H3-11631-01 STD Gasket 27-43006-8/43006 8 Gasket, Exhaust Inner Cover 6E3-41112-01-00