Hi and welcome,

I am a newbie but I will take the chance and post a reply because I just was in this situation also.
Sounds like you are running to rich, you will have to set the needles to factory settings and start tuning from there.
Factory settings the needles are; LSN (low speed needle) flush with the collar this is the screw on the side of the carb (look at image below) HSN (High speed needle) 2 1/2 turns out tighten (clockwise) the screw until it reaches all the way in (do not tighten hard!!!) and then loosen it out(counter clockwise) for 2 1/2 turns. (look at image below




Hope it helps