Yamaha - Water Pump Housing Cooling System Component 6L5-44311-00-00. Overview. On these smaller two-stroke Yamahas, the cooling system is simple, but everything has to be in good shape for it to work right. I've seen plenty of weak water flow issues come down to a worn or scored housing, even with a new impeller installed. This is the piece that keeps the pump sealed and working efficiently. If you're already in there servicing the pump, it's one of those parts worth replacing to avoid doing the job twice.. Key Features. Maintains Pump Integrity - Provides proper housing for consistent water pump operation.. Smooth Internal Surface - Ensures efficient impeller rotation and steady water flow.. Corrosion-Resistant Construction - Built to handle constant exposure to water and marine conditions.. Factory-Spec Fitment - Designed to match Yamaha cooling system components for proper alignment.. Supports Reliable Cooling - Helps maintain consistent engine temperature during operation.. Engine