Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11635-00 0.25 Viewer:1323 OEM No. : 664-11635-00-0.25 For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Kit 6H4-11631-01 STD Piston Ring 689-11610-10/689-11610-11 0.25 Tube, Water 6D0-44362-00-00/6D0-44362-01-00 Reed Valve Assembly 63V-13610-00-00/63V-13610-10-00