Do you have the airbox lid? If so, put it back on. If not, pull the seat and place a hand towel or something over the top of the airbox and put the seat back. That should mellow the power a bit... Undoing mods like the airbox or plugging up the exhaust would most likely require re-jetting. A longer screw and the gray wire are a quick, easy, cheap way to tame it down a bit.