Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6H4-11635-01 0.25 Viewer:564 OEM No. : 6H4-11635-01-STD For YAMAHA Outboard 40, 50 HP You May Also Be Interested In Piston Kit 682-11636-00 0.50 Piston Pin 634-11633-00-00 Cable, Throttle 6J0-26311-02 Oil Seal 09282-17005-000