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06 yz250f JD jetting

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I was just curious what the recomended jet settings were for a yz250f with a pro circuit slip on and the JD jet kit and riding between 0 and 3000 feet?

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I would try the red needle on the 4th clip, with a 40 pilot (2 turns out) or a 42 pilot at 1.5 turns out, with a 180 or 182 mj. Possibly you will need a 185 mj.

This is just a starting point. Set the mainjet first. Roll up into the meat ofthe powerband but do not hit the rev limiter in 5th gear, then roll from WOT to 3/4 throttle. See if the bike has a momentary surge. If it does, then increase the mainjet to a larger size. If no surge then your mainjet is ok.

I have an 06, and I found with the stock pipe one mainjet size larger than stock gets good results here in pa at 1100 to 1300 elevation.

Let me know what mainjet you do settle on, I was considering buying a pro circuit Ti4 for my 06.

Greg

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