Yamaha - Water Pump Repair Kit Cooling System Service Kit 6CE-W0078-01-00. Overview. A strong cooling system is one of the most important things keeping a Yamaha outboard running reliably, especially when you're pushing long runs offshore or running hard during tournament days. This Yamaha Water Pump Repair Kit provides the key components needed to restore proper water flow through the engine's cooling system. Over time, impellers and internal pump parts wear down from heat, sand, and normal use