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Yes you should change your variator to a steep-ramp style variator such as a KOSO, NCY or Mallossi with FLAT SLIDER weights.
A gy6 139qmb/j is a 50cc, it likes 6-7g flat sliders
A gy6 157qmb/j is a 150cc, it likes 11 to 13g flat sliders
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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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