Soot, or carbon buildup in the carb on the bottom of the butterflies is mostly normal after a lot of miles, black inside the carb throat is usually a sign of many backfires but can be cleaned with carb cleaner while the engine is running.
The adjustment screws being closed (bottomed out) concerns me.
Refresh me on the carb, model, size, new, used or rebuilt.
The adjustment screws being closed (bottomed out) concerns me.
Refresh me on the carb, model, size, new, used or rebuilt.