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Your 139qmb uses a 17 to 19mm Kiehin style carb. Using a bigger 157 style 21mm carb or flat-slide carb does not improve performance, as you must "jet down" a big carb.
Your 100cc (83cc) would prefer a 88 to 90 main jet.
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2011 Roketa MC-23-150
4T 150cc 157 qmj
24mm carb w 115 main jet and paper cone air filter
Manual petcock w Tygon fuel lines
Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust
RED spring clutch
Adjustable CDI (brand unknown, it's blue and red and works great!)
KOSO high performance variator w 12g sliders
Gates Powerlink 835-20-30 belt
GPS verified 65mph on flats.
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