Right below the primer bulb is either a round black or white plastic cover it is tiny about the size of a BB and under it is the high speed mixture screw find your smallest flat head screwdriver and file both sizes down. Heat the tip of the screwdriver with either a propane or mapp gas torch now push it into the the plug but be careful only puncture the plug and turn counter clock wise and remove the cap now you can adjust it will you flat head screw driver.
good luck :thumbsup: