Yamaha - Water Pump Repair Kit Cooling System Service Kit 6CJ-W0078-00-00. Overview. Keeping a Yamaha outboard running cool starts with a healthy water pump. The Yamaha Water Pump Repair Kit 6CJ-W0078-00-00 includes the core service parts needed to restore proper water flow through the engine's cooling system. It is a common maintenance kit many Yamaha owners install during routine service to keep their motors dependable through long days on the water. Whether you are cruising the bay, fishing o