With a jetting selection sampled from the most popular settings and well known riders from all over the world, the JD Jetting Jet Kit is designed to give you pro-level performance without having to be a carburetor expert. This jet kit will deliver reliable fueling, but with the inclusion of multi-taper needles, you'll also get adjustability for low and high altitudes. See the difference in performance you'll get over stock with a JD Jetting Jet Kit. -Main jets include spare needle clip -Dyno tested for proven gains -Developed and tested from sea level to 12000ft elevation