Something you can try, remove the idle mix adjustment screw, spray some carb cleaner in the hole.
Replace the screw, see if it will adjust. Be sure the engine is idling down around 400-500 RPM, otherwise it won't be running on the idle circuit.
The mixture adjusting screw is actually adjusting air bleed, not fuel flow, so turning it in richens the mix, out leans it.
If that doesn't do it, the carb will need to come off and be cleaned out. Usually they can be eased apart without having to buy a kit. Try that first. Spray out all the passages, poke a small wire through the idle jet, be sure everything is clear. The gasket is important, it must seal around the small hole beside the venturi. That is where the idle fuel is drawn up.
It's a simple carb, don't be afraid of it. Just work over a clear surface so nothing gets lost.
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