Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11636-00 0.50 Viewer:1378 OEM No. : 664-11636-00-0.50 For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Kit 669-11631-00 STD Piston Kit 61A-11645-00 0.25 Gasket, Head Cover 6J8-11193-00-00 Washer, Thrust 6G5-45576-00-00