my atc 200 keeps sputtering. it runs okay kinda when the choke is all the way on. i changed the plug and checke dit and it looked white. am i running lean? how do i adjust the carb? any other problems there might be? it ran fine then just started running crappy. any help is appreciated. thanks

 

yes white is running lean, verry bad, u'll burn a hole in your piston. and that would explain why it would be runnign better with choke. i've never tore a carb apart on a atc but i know on my quads jets is what richens and leans it. but sudden like that, idk mabe if you changed the filter or piped it woudl explain why its running lean, diffrent altitude also. sorry i coudlnt be more help, i just recomend not ridding it untill you get the prob solved, i'm sure lots of people on here will know alot more about it than my self. keep us posted

bowz