ESR690 is a modern high quality regulator/rectifier that replaces the not-so-reliable OEM regulator on the Honda CBR900RR / CBR954RR between 2002 and 2003 and it fits the VTX1800 models from 02-ON. ESR690 incorporates our late generation rectifier module and voltage control circuitry which we installed in our highly efficient heat sink. Our ESR690 regulator/rectifier offers superior performance compared the the stock unit: output voltage is stable at all engine RPMs, and thanks to our advanced internal power circuit and heat sink the heat generation is kept to a minimum which dramatically improves reliability. ESR690 comes with a full one year warranty!