Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11631-00/664-11631-01 STD Viewer:1400 OEM No. : 664-11631-00/664-11631-01-STD For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Kit 6H4-11636-09 0.50 Piston Kit 69L-11636-00 0.50 Piston Pin 12151-94400-000 Impeller 47-F40065-2/F40065-2