completely refusing to start doesn't really sound like valves, Chis. I'm wondering if the ignition unit is getting hot and quitting.
Jacob, get it to do it again, and be ready with a spare spark plug of any type. When it won't start, unplug one of plug wires and plug it onto the spare plug, lay on the top of the engine when the outer part gets a ground, crank the engine, and see if it sparks. At least that will narrow down whether it's an ignition problem or a carburetor problem.
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