Sounds like a stuck float/needle valve, though it could also be a loose drain plug on the bottom of that carb. Try this, it worked to free a needle that wasn't seating on my '85 earlier this year: Get on the bike, leave it off, and rock the bike from side to side as much as you can safely; I guess the sloshing of the fuel in the bowls helps the needle find its seat.
You have to remove the whole carb set to remove individual carbs from it.
"During times of universal deceit, telling the truth becomes a revolutionary act." ~ George Orwell
1995 1500 Aspencade named "Cochise"
1985 1200 Aspencade named "Tatanka"
IDMWT club #18