Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 664-11610-20 0.50 Viewer:767 OEM No. : 664-11610-20-0.50 For YAMAHA Outboard 25, 30 HP You May Also Be Interested In Piston Pin 6F5-11633-00 Piston Ring 6F5-11610-00-00/6F6-11610-00 STD Gear 6H9-45551-00-00(13T) Gasket, Exhaust Cover 6H4-41114-00-00