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Since it " goes into high" quickly, that's pretty much what it's supposed to do.
"lacks push" is more of a misunderstanding of the engine's operation on your part, than a rectifiable situation.
Top speed of a gy6 with an 83cc BBK is only about 45mph flats, 30mph on moderate hills.
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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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