Trail Tech (SR-8500 100W Stator Kit Fits Yamaha YFZ450 non-EFI ATV 2004-2012 Increase power output significantly, perfect for adding lights and turning night into day Electrical System kits contain regulator/rectifiers and model-specific connectors Trail Tech stators are custom made by Trail Tech, not purchased from bike manufacturers and rewound Because Trail Tech manufactures stators from scratch, a superior level of craftsmanship, performance and value is achieved