Once the water pump on your dirt bike fails it needs to be replaced before anymore riding. Water pumps either wear out from age or a crash busts them up and you'll know usually right away when white smoke protrudes from the engine.
Hot Rods makes a kit that fixes your broken water pump for much less than higher end competitors while keeping the same integrity and durability. The Hot Rods Water Pump Repair Kit is manufactured to OEM specifications and includes a water pump cover gasket or O-ring, and water pump shaft bearings and seals to repair the leaking water pump seal and/or a failed bearing.
Hot Rods also makes a Water Pump Shaft Kit that you'll likely need if your existing water pump is leaking. Both the rebuild kit and shaft kit are complimentary and together still save you money over OEM.