First, find out the name of the mechanic who did the carb work and never go there.
Second, doesn't seem like the carb was cleaned at all.
Third, maybe the carb was not assembled properly.
Fourth, post your location so a nearby Tdubber who isn't afraid of a li'l ol' carburator can show you how to set up a carb correctly.
Fifth, rejet the carb.
Finally, dump the old gas and fill up with fresh 87 (R+M)/2 octane, preferably with no ethanol.