The elevation needs to change about 2000ft DA or so to require about a. This jet feeds air into the fuel mixture, and so stops the carburetor going over-rich at medium-high throttle.220 1. The air correction jet size is very important when using a smaller carburetor on a larger engine. At high elevation, the carburetor air-fuel mixture will be too.Adjusted jetting is idle 55, main 127.5 or 130, air correction jet untouched at 125, and power jet 65.
Do a test run again, pay attention to how the bike feels! If your bike is reluctant to REV out like before then you are too rich. Install a main jet that is two sizes richer (the number on the jet will be higher on a richer jet). After you have made your test run with the stock jetting. Our Carb Jet Kits products will help you PUSH THE LIMIT of what your Dirt Bike is capable of.The carb's main jet affects how the carb works from half throttle to full throttle.
Jetting A Carb Install A Richer
If your bike is sluggish or unresponsive until past 1/4 throttle that is a sign your pilot jet may be too rich or too lean.To test the pilot jet follow the same proceedings as the main jet, remove the stock pilot jet and install a richer (larger size) pilot jet then repeat your test. Pilot JetHe pilot jet has the greatest influence from idle to 1/4 throttle. Keep doing this until you feel a noticable improvement in power.
With engine running steady, turn the air screw clockwise until the engine rpm drops.Then slowly turn the air screw out until the engine rpms pickup. The Air ScrewTo adjust it, the engine needs to be warmed up.Once warm bring the bike up to a steady throttle setting (about 1800rpms) get a friend to hold the throttle steady. Repeat the steps going either richer or leaner until throttle response is crisp and clean.
Needle SettingYour carb needle affects throttle settings from 1/4 to 3/4 turn. If the engine has peaked before 1/2 a turn out it is a sign you need to go to a richer pilot jet. Peak rpm is when the engine runs its cleanest and fastest.The most common air screw setting is from 1/2 turn to 2 turns out.Note: lf your air screw is more than 2 turns out it is a sign that you should switch to a leaner pilot jet.
Your main adjustment is your Main Jet. If it boggs or dies right off from an idle when you turn the throttle, your pilot is too lean.You Need to get the Pilot tuned in so it will come clean off an idle BEFORE moving on to other adjustments. If you find your clip position at the very top or bottom, you will need to go back and change main and pilot jets.A properly jetted carb will have the clip on the needle in one of the middle three notches Quick Tips For Small 4-StrokesPlease Start tuning with a Clean & Properly oiled air filter in placePlease test ride the bike , you cant jet / tune a bike sitting on the stand ! Don't be afraid to move the clip up (this will lean the carb).The needle setting is important because most riders send most the there riding time in the needle range.Try all the clip positions on the needle to see what runs the best.
Make sure you can see light through all the jets. When fine tuning your adjustment screws, turn them all the way in, and back out, 1 and a Half Turns, for your starting point.Before changing any adjustments on your carb
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