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Re: Spark plug diagnosis
If the adjustment of the mix screws has no effect that tells you that the idle screw is cranked up enough to expose the idle transfer slot completely and you’re idling on the power circuit.
One of the cures is hooking the vac pot to manifold vac on the carb and advancing your initial timing. Both of those will allow the closure of the idle screw and the mix screws back working like they should.
Plug looks rich.
Rub it in your palm.
If the black is dry and sooty it’s rich.
If the black is wet it’s oil.
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