ok so when first started idles fine and everything rev it up comes right back down to idle.just seems like after you start riding come to a stop idles little bit higher not insanely high.plug is brownish black but more brown so i no im not lean.sprayed carb cleaner everywhere i could have a leak.no signs of one.have my filter right on the carb could this be causing it to act somewhat like an airleak making it rev little higher?