Cleaning the carb won't do any harm. Make sure that the fuel flow is being cut off when the float is at the right height. If there is too much fuel in the float bowl it will run as rich as Richard Branson, which would cause shit running and black smoke. Best way to check that is with the carb stripped get a length f clean tube on to the carb fuel inlet and blow through it. When yu gently lift the float it should be impossible to continue blowing - that will prove if teh fuel is getting shut off OK.
Enoch
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