Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6F6-11635-00 0.25 Viewer:872 OEM No. : 6F6-11635-00-0.25 For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Kit 689-11635-00 0.25 Piston Ring 6H4-11610-20-00 0.50 Spacer 670-45997-00/670-45997-02-00 Piston Ring 431870/0431870 STD