Did you try the old spark plug wire screw driver test? If not, simply remove one of the plug wires from the spark plug, stick a screw driver in the plug boot, and hold the metal portion of the screw driver close to, but not touching the block. Have someone crank the engine and see if you get spark from the screw driver to the block. If so, the ignition is working at least on that wire. I would do that test on several other spark plug wires to determine that the wires are not the problem.
Also, when was the last time this was started?
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