So I just rebuilt my top end with FAST dune ported cylinders and a cool head 20cc domes and now when I keep the throttle pinned through the gears, it acts like its running out of fuel when I get into 6th gear. Its got stock carbs. Would this be a float level problem or could it be loading up? It is rich right now. Im running 330 mains but im about to try 310s and do a plug chop.