You will find all the 12v voltage regulators we can have for your 4 stroke Yamaha motorcycle like YZF, YZ-F, WRF, WR-F,... In this category we will propose you original regulators but also adaptable ones much cheaper and of as good quality. How to know if you need to change your voltage regulator ? The simplest and easiest way to detect it is simply to go up in the towers. The ignition will produce more voltage and if the regulator outputs more than 13v the regulator is no longer working. Often people burn out their bulb quickly without knowing why. This is simply due to the voltage regulator that must be changed.