Hot Rods – Water Pump Kits, including kits for the 99-21 Yamaha YZ 250, the 98-04 YZ 125, the 93-01 YZ 80, the 92-04 Kawasaki KX 250, the 90-04 Honda CR 125 R, the 86-02 CR 80 R Big Wheel, the 17-19 Suzuki RMX 450 rebuild kit and counter balancer kits for the 98-00 WR 400 F and 01-02 WR 426 F. Kits bundle the impeller shaft, seals, O-rings and bearing where applicable, so a weeping pump gets fixed properly rather than patched with one seal. A dirt bike cooling system runs hot and slow at trail speed and gets no airflow in deep ruts, so a worn water pump seal quickly turns into coolant in the oil or oil in the coolant, warped head gaskets and a seized top end. Rebuilding the pump keeps flow through the radiators steady, holds temperature down on long climbs and tight singletrack, and stops the boil-over that costs you a ride. A healthy pump also protects the fresh piston and crank work you already paid for, and the balancer kits in this category cut the buzz that loosens hardware on four-stroke thumpers over a long day. Tell us the year and model and we will confirm the correct water pump kit for your bike before you order.