Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11636-00 0.50 Viewer:1379 OEM No. : 664-11636-00-0.50 For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Kit 6R5-11642-01 STD Piston Kit 662-11631-01 STD Pin, Detent 17-828356/828356 Gasket, Cylinder Head 3C7-01005-1/3C7010051M