6GR-W0078-01-00 supercedes 6GR-W0078-00-00

Yamaha - Water Pump Repair Kit - Cooling System Service Kit - 6GR-W0078-01-00

Overview

The Yamaha Water Pump Repair Kit | 6GR-W0078-01-00 is one of those kits you don’t wait on, especially with a motor like the XTO 425. When cooling starts slipping even a little, it can turn into a bigger problem fast. This kit gives you what you need to refresh the entire pump instead of chasing individual parts. If you’re staying ahead of maintenance or fixing water flow issues, this is the way to do it right.

Key Features

• Complete Pump Rebuild Kit – Includes key components needed to fully service and restore the water pump.

• OEM Fit Precision – Built to Yamaha specifications for exact fit and proper alignment.

• Restores Cooling Performance – Helps bring back strong water flow and stable engine temperatures.

• Heavy-Duty Marine Components – Designed to handle high horsepower, heat, and continuous operation.

Engine & Boat Compatibility

• XTO 425 2018-Current

FAQs

Q1: When should I replace the full water pump instead of just the impeller?
A: If seals, plates, or internal parts are worn, replacing everything together is the better move.

Q2: What are signs the water pump needs rebuilding?
A: Weak water pressure, overheating, or inconsistent cooling performance are common signs.

Q3: Does this kit include everything needed?
A: Yes, it includes the main components required for a full water pump service.

Q4: Is this considered routine maintenance?
A: Yes, especially for high-output engines like the XTO where cooling is critical.

Q5: Is installation difficult?
A: It requires lower unit removal, but it’s a standard service for most outboards.

• Engine Application
  • XTO 425 - 2018-Current