47 carb problem

"cosmicray48236" <sgreiner@...>

I really need some help. The 47 seems to run fine except that when it
starts when cold, a lot of blsck carbon stuff seems to come out of the
exhaust. My impression is that the carb is set too rich. It is a
Tillotson and no matter how I adjust it, the needles make no
difference except when almost closed. Also, the engine runs much
smoother and at a higher rpm when the choke is set about 1/3. Can
anyone offer any suggestions. Thanks. Skip