WALBRO LMK
have a kohler courage with a walbro LMK. It idles rough and will not run with the air filter cover installed. If you take the cover off it will run but rough. I’m thinking the air/fuel needs to be adjusted. There is an idle limit screw and another screw that had a slot for a screwdriver but I am unable to get it to move in either direction. Is this actually adjustable?