Yamaha Water Pump Repair Kit 692-W0078-02-00. Overview. The Yamaha 692-W0078-02-00 Water Pump Repair Kit is a genuine OEM service kit designed to restore proper cooling system performance on select Yamaha mid-range outboard engines. The water pump plays a critical role in circulating water through the engine to regulate temperature and prevent overheating during operation.. Over time, components such as the impeller, seals, and gaskets can wear due to constant friction, debris in the water, and