There is a single idle mixture screw on top of the carb, if there isn't much change and still running rough, you'll need to re-jet. Try .55-.60 idle jet, worked well for mine. Ordered 170 mains waiting to put in and test.
it's the screw right above the mounting bolt on the left rear of the carb. you'll have to adjust the idle screw as well as you lean it out. then check your timing again
The only adjustment that you can lean out would be the idle circuit. That would be done by adjusting the idle mixture screw(s) while monitoring the vacuum and or the engine rpms. To make a carburetor...
Depends on what you need to adjust. Air/fuel are on front of carb low on right and left, basic start point from seated is 3 turns out. The idle screw is located inside throttle linkage on right side....
The following procedure applies to all small enginesIf the engine does not start:(1) rotate the carburetor main jet needle valve clockwise (close) until it touches its stopping point - DO NOT FORCE...