The valve clearance is a lot less likely to be the cause of it not running at all. The carb has these things inside called jets, which have tiny orifices which can become clogged. When you tear it apart, you can clean these out with guitar string or something similar. And usually you have a float and needle valve which has to be adjusted to a certain clearance. A carb rebuild kit would likely have instructions and any new gaskets and replacement parts. Or you can just strip it and clean the jets, and look up the adjustment somewhere. Just be sure to keep track of how everything goes back together, there may be a lot of parts in it.
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