Yamaha Water Pump Impeller (SEH-80X-1) YJA-01143-76-03. Overview. The Yamaha YJA-01143-76-03 Water Pump Impeller (SEH-80X-1) is a genuine original equipment manufacturer component designed to circulate cooling water through the engine and maintain proper operating temperature. The impeller is a key component of the water pump system, using flexible blades to draw water from the lower unit and push it through the engine's internal cooling passages.. Consistent water circulation is essential for p