One possible cause of the engine not turning over is a blockage in the fuel delivery system. To check this, you can try to start the engine with a small amount of fuel directly from a fuel can or with a fuel line running directly to the carburetor. If the engine starts in this condition, then the issue is with the fuel delivery system, possibly a clogged gas tank, fuel line, or carburetor. It is also worth verifying that you have the fuel shut-off valve in the "run" position and not the "off" position.
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