Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6F5-11635-00 0.25 Viewer:1302 OEM No. : 6F5-11635-00-0.25 For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Kit 61A-11646-00 0.50 Piston Kit 688-11636-03 0.50 Piston Kit 6G5-11631-00 STD Wrench 91-61069T/61069T