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Message: [QUOTE="boyo, post: 666773, member: 42088"] 150 is too rich? As I know stock is 165 or so. As I could see lot of 250KDX are running with 155-165-er main jets. I'm confused, I own a 93'er KDX250 and I tryed 165-158 jets, but I had the same result, I tryed the !122! jet from my 89'er KDX200 and it was much better, but tinkling ( jingling? ) at WOT on high rev. ( I think pure mix. ) and boiled the coolant out immediately. It is very difficoult to get jets here in Hungary. Can somebody explane me why there are so big differences between jettings in the same bikes. ( I know, I know... but I read all "jetting" stuff here in the forum ) I have stock pipe pilot jet:42 ( too rich ) stock slide and needle [/QUOTE]