Azimut 43 Cummins - Black smoke coming out from engine

by Henry
(San Francisco, CA)

I have a Azimut 43.y engine cummin. Recently, when the boat runs at 2000 rpm, it's locked and black smoke coming out from the engine (exhausted pipe) It will then dropped back down to 1700 rpm. Is there something I should be concerned of? What should I do next?

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