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If it’s blowing black that usually a sign of running rich , if the smoke has a bluish tinge to it it’s oil burning

What ever it is, it's always best to try adjusting the mixture first because that is (even the hard to get at adjusters), the easiest thing to try. It checks the mixture screw is changing the mixture enough too, which is a good thing to check. If winding the screw a full turn each way didn't have a dramatic effect, then it would be a guide/helpful in the diagnosis.