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Optimal settings will typically be 1.5 to 3 turns out on engines in good working order. From there turn the screw one quarter turn out and try to start the engine.

#6 – With the screw turned all the way in the ATV will be in the lean position, very little fuel will pass.

Inward to start, all the way in but don’t force it too tightly. Do not turn it outwards or it will eventually fall out.

#5 – Using a key, or edge of a driver’s license or anything small enough to fit in the carb adjustment screw, carefully turn the screw clockwise(inward) as far as it will go.

This is not attaching the carburetor to the engine, it’s going to turn freely if you adjust it. Visually inspect the ATVs carburetor and locate the air/fuel adjustment screw. #4 – Still stuck? No owner’s manual? No screwdriver? OK.#3 – If you have the owner’s manual for your ATV follow the carburetor tuning instructions carefully.#2 – If you have a phone with signal let someone know that you are on the trail and that your ATV is not working properly, tell them where you are.Make sure the battery is properly attached. Look for signs of obvious damage or dirt in the air intake. With the engine off grasp the spark plug wire and make sure it’s securely attached to the engine. Altitude directly affects engine performance because the higher you go from sea level the thinner the air gets.

Other factors that affect jetting are rev limiters, altitude and fouled plugs if your jetting is off. Increased engine performance usually means an increased demand for fuel so learning ATV carburetor adjustment techniques is important. #2 – The second thing you need to know is that aftermarket performance parts will change your jetting requirements. Lastly your main jet controls the flow of fuel between the three quarter and wide open throttle positions. The needle jet controls the flow of fuel from the one eight position up to about the three quarter throttle position. The pilot jet, or pilot screw as it is sometimes referred to, controls the flow of fuel between Idle speed and about one eight of wide open throttle (WOT). Each jet is effective for a specific throttle position range. #1 – The first thing you need to remember is that ATV jetting refers to throttle position, not engine rpm. A comprehensive installation guide will come with the jetting kit you purchase for your make and model of ATV so instead this guide will focus on explaining the basic principles of how ATV jets work. You can tune your own ATV jets and avoid common jetting mistakes if you understand some jetting basics, explained below.