Try an ULTRA dose or seafoam, to try to break the carbon loose. 1 gallon of gas and 1 bottle of seafoam, go ride for at least 30 miles, smooth and easy, ignore the smoke, when you return let sit for 1 hour, fill tank with clean gas, go for another ride this time you ride HARD. By hard I don't mean fast I mean, high revs, Hop on the Freeway wind it out to speed limit in 3rd, and stay in 3rd there for 10-15 minutes. Goal is to keep the revs HIGH.
93 VT1100C Sleeper, VH Exhaust, Saddleman Seat, Baby Apes, Metzlers, 2mm sleeved and bored (1150cc),10.5:1 comp, Modified Heads, Valves, Cams, Adjustable Timing, Bored Carbs.