Yamaha - Water pump repair kit - 6E0-W0078-A4-00Yamaha Water Pump Repair Kit Cooling System 6E0 W0078 A4 00 Overview When youre servicing a Yamaha water pump, its usually not just the impeller that needs attention. Ive opened up plenty of lower units where the whole pump was worn, not just one piece. A full repair kit like this lets you go through everything at once and know its done right. It saves time, prevents repeat issues, and keeps your cooling system strong every time you hit the water. Key