my bike idles fine but when you give it gas it cuts out. i have messed with the jets alot and still the same thing. i bought it stock a month ago and it sputterd a little bit, but i added carb cleaner and it ran fine so i stareted to moded it. i put a prociurcit full system and got rid of the air box and jetted up to 27 pilot and 148 and 150 mains (dynojet) and it ran great for 1 hour then it stated to sputter and the plug was pich black, so i started to jet down and down and down and i still have the same problem, am i not getting anough spark or is there some other electrical problem. or is it a jetting problem? im almost back to stock on the carb and still have the same problem, the plug is black.