Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Ring 664-11610-00 STD Viewer:799 OEM No. : 664-11610-00-STD For YAMAHA Outboard 25, 30 HP You May Also Be Interested In Piston Ring 6H4-11610-10-00 0.25 Piston Kit 689-11631-00 STD Gasket 662-14198-00 Oil Seal, SO-Type 93104-16M01-00