Very few carbs do not have a mixture screw, usually it is covered by a cap you have to drill out. Some have nothing under the cap. Either way find that cap and remove it, if there's no screw, get a new carb,they are only 30 bucks.
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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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