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A mis-adjusted or dirty carb. I know you took the carb apart and it didn't "look dirty", but there is obviously a problem. Of you disassemble the carb, and clean it with carburetor cleaner, you will see the problem.
What you are describing sounds like a clogged main jet, but could be any number of things. There's just no way to speculate. The only way to find out is to disassemble the carb.
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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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