Yamaha - Impeller Water Pump Component 6F5-44352-00-00. Overview. The Yamaha Impeller 6F5-44352-00-00 is one of those parts you don't think about-until your engine starts running hot. It's what keeps water moving through the cooling system, and when it wears down, you'll see it fast in weak water flow or rising temps. On smaller outboards especially, the impeller does a lot of work every time you're on the water. Swapping it out regularly is one of the easiest ways to avoid overheating issues.. Key Features. • Cooling Water Circulation - Pumps water through the engine to maintain proper operating temperature.. • OEM Fit Precision - Built to Yamaha specifications for correct fit and efficient operation.. • Flexible Rubber Vanes - Designed to maintain strong water flow even at low speeds.. • Durable Marine Material - Made to handle heat, friction, and continuous water exposure.. Engine & Boat Compatibility. Verify compatibility with your specific Yamaha engine model and part number befor