Kfx 400

how do you know when you need a jet kit for my atv?

I have a 03 kfx 400 and i just installed a lexx mx slip on exhaust and its getting horrible throttle response so i don't know help!!

alot these things have an adjustment on the needle itself,sometimes you can lift the needle and change the clip position to see if it will help,if it will then i say put a jet kit in it

assuming your air filter is clean cause that can cause poor throttle response too just from what you have described it could use a jet kit,check to see it you have an adjustment on needle first though cause might save ya 40 bucks

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