Both needles at 1-1/2 open from fully closed for initial starting, then adjusted from there for performance. It's a U.S. Engines product. Pretty much along the lines of most Sachs based engines.

Remove the cover plates from the carb and replace the diaphragm and pump membrane with new from a rebuild kit available at most any saw and mower shop. Or browse online for a rebuild kit that relates to the carb model number.