ESR137 is a high quality regulator/rectifier that replaces the OEM regulator on various Suzuki ATVs. Our ESR137 is a modern and efficient unit that far outperforms the OEM part both in efficiency as well as in reliability. We built it on a compact and modern heat sink, used high quality lead wires, the newest generation of regulation circuits and the result is a superior regulator compared to what is stock on these Suzuki ATVs. This ESR137 comes with a full one year warranty.