Check what X bird suggested about the vent hole.
Liduno is spot on about the re-jetting of the main. How about a pic of the UNI you installed on the machine?
Lastly, that is NOT a Mikuni carb in that pic. It's a chinese clone of the Constant Velocity. (most likely a cheap replacement carb off Ebay)
Might want to try replacing the carb like JD suggested earlier if the vent checks out fine, and the main rejet doesn't solve the issue
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My Yerban assault vehicle: 2.2mm stroker crank, 62mm Nikasil cyl, Taida large vavle head, American made valve springs, ported intake manifold, TM 28mm carb, stock CDI, Bando coil, TK exhaust, stock CVT except for the 14g sliders, 13/40 internal gears, 16T drive, 31T axle sprocket, 22" rear tires, and ONE BIG POTATO CANNON mounted on top..........
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