Yamaha - Water Pump Repair Kit - 63V-W0078-02-00 - See Description for Applicable Engine ModelsYamaha Water Pump Repair Kit Cooling System Service Kit 63V W0078 02 00 Overview The Yamaha Water Pump Repair Kit 63V W0078 02 00 is one of those go to maintenance kits for keeping smaller outboards running cool and reliable. On 9. 9 and 15 horsepower engines, even a slight drop in water flow shows up fast, especially at idle or slow speeds. This kit gives you the key components to rebuild the pump and bring cooling performance back where it should