Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 664-11631-00/664-11631-01 STD Viewer:1371 OEM No. : 664-11631-00/664-11631-01-STD For YAMAHA Outboard 20, 25 HP You May Also Be Interested In Piston Ring 66T-11605-00 0.50 Piston Kit 688-11631-03 STD Drive Shaft 655-45501-10 Brush Holder Assembly 663-81840-11-00