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Usually a small engine that won't take throttle is too lean, in my experience. Try covering the air intake slightly with your fingers while you try to rev it. If that works it's too lean.
You probably have a mixture screw, an idle screw and a high rpm setting. Likely only the mixture is wrong.
Getting a 2-stroke to start and idle should be the hard part.
One other likely culprit - the carb is loose and is sucking air past the seal. They vibrate loose a lot.
As for how those little carbs work? I've never really understood them.
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