Yamaha - Impeller Cooling System 6E0-44352-00-00. Overview. If there's one part I never take chances on, it's the impeller. This is what keeps water moving through the motor, and once it starts to wear or lose flexibility, cooling performance drops fast. I've seen perfectly good engines overheat just because an old impeller finally gave out. Replacing it on schedule is one of the easiest ways to avoid bigger problems out on the water.. Key Features. Efficient Water Circulation - Pumps water consistently through the engine to maintain proper cooling.. Flexible Rubber Vanes - Designed to flex and recover shape for reliable performance over time.. Heat and Wear Resistant - Built to handle friction and temperature inside the water pump housing.. Direct OEM Replacement - Matches original specifications for proper fit and dependable operation.. Engine & Boat Compatibility. Designed for Yamaha 2-stroke outboard engines using standard water pump systems. Commonly used on smaller horsepower mot