ESR135 is a very high quality regulator/rectifier replacement for the OEM regulator on the Kawasaki Bayou/Prairie and KFX models. Our regulator/rectifier incorporates the newest generation of regulator circuits which offers extremely stable output voltage levels across the RPM range. The unit's heat sink offers improved thermal conductivity while being similar in size and shape to the OEM unit for perfect fitment. ESR135 is a superior regulator for your ATV and it comes with a full one year warranty.