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yz250f jetting

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i have a 03 yz250f and i bought it with a fmf exhaust on it and i dont think it was re jetted so i was wondering what the setting would be if i should re jet it myself and what kit i can buy that isnt to expensive

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The JD kit is highly recommended by many users on this forum. It comes with two different needles and a couple of different size main jets. I think it also comes with a leak jet, too.

I would also get a good quality fuel screw with a knob for finger adjustment. JD makes one of those, too.

Start with getting the pilot circuit sorted with the fuel screw, then work on the rest.

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Wander around the jetting database at the top. I did for a while and found it helpful. You should be able to find someone that has a similar setup and probably around your altitude also. Might not be able to duplicate their setup exactly but should be able to get you in the ballpark. Clay

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