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Im thinking though the plug may be black due to the fact that last going off if it was missfireing etc, causing the plug to foul.
I wouldnt touch the carb yet until the electrics are completely checked over.
Airfilter?
Also as mentioned about the 2 stoke oil, make sure to give the bike a really good shake side to side. Was the plug black and wet when removed? Ideally wants to be chocolatey brown
clean up any electrical connections, look for wires bolting to the frame and unbolt and clean these.
Has it recently started playing up or did you get it like it