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Do the CVT mods first, then try it out. A bigger carb is unnecessary, usually you'll get what you're after with simple jet swap and carb tuning. A non BBK 139 engine is really small, so adding a bigger carb will result in poor performance.
I also point out, if speed is the concern, a 150 is the way to go.
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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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