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-