Yamaha Water Pump Assembly YF1-E0517-30-34 / YF1-E0517-30-36. Overview. The Yamaha YF1-E0517-30-34 / YF1-E0517-30-36 Water Pump Assembly is a genuine original equipment manufacturer component designed to support proper engine cooling and reliable system performance. The water pump assembly plays a critical role in circulating cooling water through the engine, helping maintain safe operating temperatures during operation.. A properly functioning water pump assembly ensures consistent water flow t