Set the valves to .004" inches. It seems your problem is related to engine temp, and valves are the #1 cause of warm stall.
The second thing to suspect is the coil, coils that go bad usually create a warm stall right before they stop working all together.
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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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