Yamaha - Chrome Pump Kit Water Pump Service Kit 6E5-W0078-3A-00. Overview. When it comes to cooling on these older Yamahas, I don't take chances-if the pump's questionable, it gets rebuilt. I've seen engines overheat fast from a weak or worn pump, especially after sitting or running in dirty water. This kit gives you what you need to freshen things up and keep water moving like it should. Do the service, and you'll run with a lot more confidence out on the water.. Key Features. • Complete Water Pump Kit - Includes key components needed to restore cooling system performance.• Strong Cooling Water Flow - Helps maintain proper engine temperature under load.• Durable Marine Components - Built to handle heat, debris, and constant water exposure.• Consistent Pump Performance - Supports reliable operation across a range of conditions.• Exact Yamaha Fitment - Matches factory specifications for proper installation and function.. Engine & Boat Compatibility. Designed for Yamaha outboard engines