Welcome to the forum. Hope you can get one running at the minimum. I don't understand how you can get it running at all with the air intake covered. As Jonathan180iq mentioned, that is the one thing you shouldn't eliminate as the issue.
On the second bike, if you replaced the ignition switch with one of the Chinese knock-off parts, they have been notorious for having problems. Sometimes you have to fork out the cash to do it right.
Have you checked the starter to see if it is the issue?
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