Yamaha - Water Pump Repair Kit Cooling System Service Kit 6EG-W0078-00-00. Overview. If you've been around Yamaha outboards long enough, you know the water pump is something you stay ahead of-not wait on. I always tell people it's cheap insurance compared to dealing with an overheated engine. This kit gives you what you need to freshen things up and keep water moving the way it should. Swap it out on schedule, and you avoid a lot of problems before they ever start.. Key Features. • Complete Serv