Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11631-00/664-11631-01 STD Viewer:1382 OEM No. : 664-11631-00/664-11631-01-STD For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Kit 6K5-11636-03 0.50 Piston Kit 69L-11645-00 0.25 Clutch, Dog 57621-87J02-000 Throttle Shift Control Cable 21F