I only get the black smoke when I rev it up real quick from idle, but still only get like 100 miles per tank, or somewhere around there. air filter is my next target at this point. its the ONLY thing I havent tried yet, short of different carbs.
so far, within the time permitting between going to class during the week, and sleep, I've cleaned the carbs about 20 times, set the floats to the proper height, set the fuel mixture about 5 times, and replaced the plugs with new ones, bright blue freakin spark coming off em btw, and still nothing helps.
Hopefully someone can give me SOME kind of advice.