rite one problem solved, i used to have the same problem with bike, i lightened the rollers even more but sometimes it worked (first time u accelerate from turning it on) then it went like crap after that, i think its because the main jet is a bit too big, dont go too fast but let the carb run without the air filter and give it throttle and see how that goes, the bike will bluhhh becuase its not getting enough fuel so you will have to back off. But off the line should be good.. if this works then your running rich low revs, adjust the mixture screw by 1/4-1/2 turns so it idles the highest (takes 30seconds to adjust mixture roughly) and then see how it goes, you might have to move the needle up a notch