09 yz450 idling problems

Ok...its my buddies bike, he bought it leftover in late of 2010 and it had been sitting for awhile in showroom, never ran right from the start and the dealer kept telling him it was fine because they took it around the parking lot and that was it, anyway he tore the carb apart and cleaned it and its running great now except for when its in neutral it idles fine then once you put it in gear it idles a lot higher....have tried all adjustments on idle nothing is working, could it be a air leak?

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