My 2001 EC250 was fouling plugs when I first got it. It had the LTR Racing kit in the carb and that was the problem. LTR machines off the markings so you do not know what needle you have. The needle and idle jet were much too rich for the trail riding I do. I went to a K needle with the clip in the bottom slot and 38 idle jet. I left the 178 main jet in and the bike is running fine in cooler weather. Keep records of every change you make and note just what each change does to the bike. Once you have everything right in the carb just a little tweeking is all you should have to do unless you change altitudes.
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