Yamaha - Water Pump Impeller 6H3-44352-00-00. Overview. The Yamaha Water Pump Impeller 6H3-44352-00-00 is one of those parts you don't skip if you want your motor to stay healthy. When it starts wearing down, you'll notice it in weak water flow or rising temps, especially at idle or slow speeds. It's constantly moving water through the engine, so it takes a beating every time you run. Swapping it out regularly is one of the simplest ways to avoid getting stuck with an overheating issue out on the water.. Key Features. • Consistent Water Flow - Keeps cooling water circulating through the engine to maintain safe temperatures.. • OEM Fit Precision - Designed to match Yamaha water pump housings for proper fit and performance.. • Flexible Blade Design - Maintains pumping efficiency across varying engine speeds.. • Heat and Wear Resistance - Built to handle friction, heat, and continuous marine operation.. Engine & Boat Compatibility. • 40 1995-2005• 50 1995-2009• 60 1995-2009• 70 1984-2003•