This is a complete lighting stator for your YZ250 that replaces the OE stator in your bike. It comes as an aluminum plate with 4-pole stator coil mounted, complete with wire leads, pulser and connector block, ready to plug in. The item is backed by a full one year warranty. This stator is a very cost effective and high quality replacement for the OE stator, and it provides a nice lighting output as well. We recommend using a 35W halogen bulb in your headlight, and safeguarding the system with our ESR012 AC Voltage regulator.