ok, so the previous owner of my 1987 tw200 removed the little brass plug on the carb and the fuel/air mixture screw is exposed. so, i have a feeling that he also adjusted it. the bike seems to sometimes hesitate when giving it throttle and have little "hiccups" when cruising/ have little engine power surges(thats the best way i can explain it.haha). ive been through everything i could think of and this is the last thing i can think of to cause this problem. i was wondering if anyone can give me some insight on adjusting the screw for maximum performance as well as the factory reset...? thanks!