Yamaha - Water Pump Repair Kit Cooling System Service Kit 6AW-W0078-00-00. Overview. When you spend enough time around Yamaha outboards, you learn quickly that a healthy cooling system keeps everything running the way it should. This Yamaha Water Pump Repair Kit 6AW-W0078-00-00 gives you the core components needed to restore proper water flow through the engine. It is the kind of maintenance kit many boat owners install during routine service to keep big offshore motors dependable season after s