Yamaha - Water Pump Repair Kit - Cooling System - 6L5-W0078-00-00

Overview

Water pump issues are something you don’t want to gamble with—once cooling drops off, it doesn’t take long to run into bigger problems. This kit is the kind of rebuild you do to stay ahead of that, especially on smaller two-stroke Yamahas that see regular use. It’s a solid refresh that brings water flow back to where it should be without piecing parts together one by one. If you’ve been running the same pump for a while, this is a smart maintenance move.

Key Features

• Complete Pump Rebuild Kit – Includes essential components needed to restore proper cooling system function.
• High-Quality Impeller – Designed to maintain strong and consistent water flow through the engine.
• Precision-Matched Components – All parts are built to work together for proper fit and reliable operation.
• Corrosion-Resistant Materials – Holds up well in both freshwater and saltwater environments.
• Includes Hardware and Seals – Comes with bolts, plates, seals, and inserts for a thorough repair.

Engine & Boat Compatibility

Designed for Yamaha two-stroke outboard engines, commonly used on small horsepower models found on tenders, skiffs, and lightweight fishing boats. Always confirm part number compatibility before installation.

FAQ

Q: What are signs my water pump needs rebuilding?
A: Weak or no telltale stream, overheating, or inconsistent water flow are the biggest warning signs.

Q: How often should I replace the water pump components?
A: Most boaters do it every season or every couple hundred hours, especially in saltwater use.

Q: Is this something I can install myself?
A: Yes, if you’re comfortable dropping the lower unit and following basic service steps.

Q: Do I need to use any special grease during installation?
A: A light marine grease on seals and the impeller helps with installation and initial startup.

Q: Will this fix overheating issues?
A: If the problem is caused by a worn impeller or pump components, this kit usually resolves it.