Just went on my first ride with my 04 wr450f. It's having an issue where it surges any time it's past idle, unless you rev it quickly. Seems like a constant rev limiter everywhere. Also is sucking gas WAY faster than the other 3 I am riding with. Playing with the air screw changes it a little but can't eliminate it. Idles highest with air screw ALL the way in if that helps. Mods done are only the pipe tip. Not airbox, maybe not even rejetted but I can't know for sure. Riding at 4k feet. Will be ridden between 2-6k mostly. Any advice on how to fix?