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Message: [QUOTE="waronwoods, post: 928149, member: 61582"] [b]jetting confusion[/b] I am also confused.... I have been riding my KDX 220 for 2 years without touching a thing on it, and I'm still running the original plug it came with. I have had no problems with any part of the powerband. Yesterday I strapped on a Gnarly Desert+powercore2 and cut half the air box out. took it out for a short ride this morning and it seems to run perfect??? should I worry? [/QUOTE]