ESR341 is a high quality regulator/rectifier that replaces the OEM regulator on the Kawasaki KLF400 between 1993 and 1999. It has been designed with modern electronics inside a new heat sink that has the same shape and size of the OEM unit but is much more efficient at dissipating heat. ESR341 offers a stable output voltage across the battery terminals which means your battery charge rate will always be 100%. Never too much, and never to little. This superior regulator/rectifier is supplied with a full one year warranty