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Do you mean the pilot airscrew? That only affects the running at tickover.
About the only useful reading you can get from the plug is mixture at WOT on the main jet - there's too much noise everywhere else. You can clean the plug and do a proper wide open plug chop to see what the combustion is like there and if good, a little soot from sitting around idling is no big deal. Add another quarter / half turn out on the pilot airscrew and see if the idle rises.
Jung
@drøn
If I look at a spark plug and realise that mixture is a bit rich and adjust the mixture screw a bit. How long will I have to ride before I can look at the spark plug again and see if it’s better?