Moose Racing Dynojet jet Kits provide a simple and affordable solution to carburetor tuning problems  Kits increase power and smoothness throughout the rev range while maintaining optimum fuel economy  NOT COMPATIBLE with California spec. bikes  STAGE 1 KITS  Designed for machines with stock engines using the stock airbox, air filter and stock or aftermarket exhaust  Fully adjustable to allow for the use of well-designed aftermarket exhausts and stock replacement air filters  Improve throttle response and drivability  Power increases of approximately 5% throughout the entire power range