Yamaha - Water Pump Repair Kit Cooling System Service Kit 6N6-W0078-02-00. Overview. The Yamaha Water Pump Repair Kit 6N6-W0078-02-00 is the kind of kit you use when you want to fully reset the cooling system instead of guessing which part is worn out. On these mid to larger outboards, once water flow drops off, it's usually more than just the impeller. This kit gives you the core components to bring the pump back to proper working condition. If you're doing maintenance or fixing overheating issues, it's a solid, complete solution.. Key Features. • Complete Pump Rebuild Kit - Includes essential components needed to restore full water pump function.. • OEM Fit Precision - Built to Yamaha specifications for proper alignment and dependable operation.. • Restores Cooling Efficiency - Helps bring back strong water flow and stable engine temperatures.. • Durable Marine Components - Designed to handle heat, friction, and continuous engine use.. Engine & Boat Compatibility. • F115 2000-2005• 1