I have a stumble between 4&5k. since the pipe was put on it has never been right. had a friend look at it the other day, he said raise the needles one, he says it is the transition from the needle jets to the main jets and raising the needle will richen it up before it transitions to the main jets. does this sound right or is he full of shit....... if that does sound right can i pull the tops off without pulling the carbs, to raise the needles. oh and by the way it was rejetted when the pipe was put on,also when you crack it open between 4&5k it just falls on its face and starts bucking, this is really pissing me off hopefully you guys can help me!