Yamaha - 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 be. If you're doing routine service or fixing overheating issues, this is a solid, straightforward fix.. Key Features. • Complete Pump Service Kit - Includes essential components needed to restore water pump operation.. • OEM Fit Precision - Built to Yamaha specifications for proper alignment and reliable installation.. • Restores Cooling Flow - Helps bring back strong water circulation and stable engine temperatures.. • Durable Marine Components - Designed to handle continuous use, heat, and water exposure.. Engine & Boat Compatibility.