Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11635-00 0.25 Viewer:1344 OEM No. : 664-11635-00-0.25 For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Kit 6F6-11631-00 STD Piston Ring 6F5-11610-10/6F6-11610-10 0.25 Propeller 6E0-45941-01-EL Water Plate 16159 2