New Owner - Black Smoke

Oct 30, 2019
77
Lots of black smoke and carbon being spewed from the exhaust.

The prop was covered in barnacles, which could be part of it but I
suspect the injectors may need some attention. Any suggestions?

Also, is there anyway to Rev the engine without the prop engaged?

(I have the MD6A Combi prop - One Lever control and no Knob to pull
out to disengage it. It seems like the engine is running at very
low revs)