The main issue I think is vacuum related. That appears to be the vacuum line to the air filter box. That isn't removed. If you look close it was snapped off and dragging under. All around the engine. Just freely hanging there.
Although I was wondering why no one suggested just filling the carb with cleaner rather than taking it apart. That's what we did with our mowers when they sat for a bit at my old landscape company. It always fixed the problem.
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