Utility ATV Jet Kits

Frequently Asked Questions

• What is a jet kit and who is it for?

  A jet kit is a carburetor tuning package for bikes and ATVs with carbs (not fuel-injected), letting you adjust the air/fuel mix for stronger, cleaner power across the throttle. It’s ideal for dirt, utility, and older street/cruiser machines that see elevation, weather changes, or performance mods.
• What’s included in a jet kit and how do the parts affect throttle response?

  Most kits include multiple main jets, pilot jets, a needle with clip positions, and sometimes an air screw or tools. The main jet affects high throttle, the pilot controls idle to low throttle, the needle fine-tunes midrange, and the air screw trims idle mixture.
• How should altitude and temperature influence the jet sizes I choose?

  Higher elevation and hot conditions generally call for smaller (leaner) jets, while colder, denser air needs larger (richer) jets. If you ride across varied terrain or seasons, pick a kit with multiple size steps for quick tuning.
• Do intake, exhaust, or big-bore mods change what kit I need?

  Yes—freer-flowing intake/exhaust or added displacement typically need richer jetting, especially on the main and needle circuits. Choose a kit that covers richer ranges for your specific carb type.
• What’s the best way to dial in a new jet kit quickly and safely?

  Confirm your carb model (e.g., Keihin or Mikuni) and stock jet sizes in your service manual since jet numbers aren’t standardized, then change one circuit at a time and test ride. Read the spark plug: tan/gray is on target, black is rich (downsize), and white is lean (upsize).