Your exhaust valve is orange, meaning it is hanging open and not sealing correctly, and that you are running your fuel mixture too lean.
Replace the head, valves, valve springs, rockers, cam, gap valves to .004" (inches) and try again with PROPERLY adjusted carburetor.
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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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