Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 664-11610-20 0.50 Viewer:744 OEM No. : 664-11610-20-0.50 For YAMAHA Outboard 25, 30 HP You May Also Be Interested In Piston Ring 6H4-11610-20-00 0.50 Piston Ring 688-11610-00 STD Gasket 319332/0319332 Packing, Lower Case 6G8-45315-A0-00