Yamaha - Chrome Water Pump Kit Cooling System Service 6H3-W0078-0A-00. Overview. When you're going into a water pump, it's worth doing it right the first time. I've seen too many quick impeller swaps come back with the same issues because the rest of the pump was worn out. A full kit like this gives you a clean reset on the whole system. Once it's done, you know your cooling flow is where it needs to be every time you're out running.. Key Features. Complete Pump Rebuild Kit - Includes the essential components needed for a full water pump service.. Consistent Cooling Performance - Helps maintain steady water flow to protect against overheating.. Corrosion-Resistant Components - Designed to handle harsh marine environments, including saltwater use.. OEM Fitment Design - Built to Yamaha specifications for proper alignment and sealing.. Full System Refresh - Ideal for replacing worn pump parts during routine maintenance.. Engine & Boat Compatibility. Designed for Yamaha outboards with comp