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38mm is the standard size of a 50cc gy6 carb filter-side. That carb is a basic 19mm standard 50cc carb.
The standard size carb for the 150cc is a 24mm with a 42mm filter-side(inlet).
50mm is 74.5cc, so it's an 80cc, not a 100cc.
Now about carbs in general:
Bigger NOT better. With carbs, it's about stoichiometrics, which is optimizing the air to fuel ratio, it's not about simply throwing more gas at it. So a 150 carb is pretty much useless to a 139.
You probably have a larger main jet in your current carb, or it would be dangerously lean, or most likely, not run at all with the stock main jet.
The speeds you indicate are about the maximum for your cc's w significant cvt mods.
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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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