Fuel consumption and the colour of the plug will contain the answer to if it's running rich, but if it's getting the extra fuel via the idle circuit or enricher you usually end up going back to stock settings to prove it. I could have thumped the Guzzi mechanic who solved the leaking enricher plungers on my dads (then new) bike by turning down the idle and mixture, they tell you the standard settings for a reason.
Andy
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