It's running super rich. Things to take a quick glance at: Powervalve opening? What is your needle position/Needle #, Mainjet #, Also how many turns is your air screw in?, and make sure your choke isn't on. lol
When doing a sparkplug test, make sure the sparkplug is new. Because if you have been running it rich for sometime it will be black.
Get back with the mainjet # (stamped on the side of the carb). Also, just for kicks, try raising the needle clip (dropping the needle) and see if that is of any help.