On my 83 VT 750 I just checked all of my plugs. Three of them looked fine the one plug that goes in on an angle on the front cylinder was black and sooty. But the other plug on the front cylinder look perfect as did the two on the rear cylinder.
I do have a question about the two plugs per cylinder one is on an angle where the other one is straight in which one is the one that actually fires the fuel and which one is for the secondary purpose?
Plug wire seated firmly on black plug, bad plug or spark plug wire or wire not seated properly at the coil. Spark plugs are cheap, buy a new one and gap it, then insure connections are secure at the plug and coil.
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