There are alot of things that could be wrong. Check the plug for the "read". Whiteish is lean, black is rich, brown is good. Try it with the choke about half on and see what that does. If it's worse you know it's to much gas. If it's better it's probably a air leak. Try turning the idle way up then spray some wd-40 around the carb mount, intake flange, around the head and around the cylinder base. See of the rpm's jump or you see bubbles. The needle settings only affect the mid throttle and idle. If none of that helps take the carb off remove the bowl. Turn it upside down and bend/set the float tabs so it looks level. Using a piece of fuel line turn it right side up and blow thru the fuel nipple and lift the float with your finger to see if it closes so you can't blow thru it. Remove the slide while the bowl is off and look thru the jet in the middle make sure it's not clogged. Good luck man