Sounds like it is running too rich therefore causing sooting (Black) this will inhibit the spark from igniting the fuel as you need a 14.7/1 air/fuel mix. Suggest you screw in the air screw and count turns, it should be 1 1/2 to 2 turns. Unscrew it back by that amount of turns if you don't have a manual to check?
Also check the air intake is not blocked
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