You should experience no difference in performance at 60f. The difference between freezing and 60f is only a factor of initial cold start up. The gy6 becomes fully warmed in approximately 3 minutes.
What you are describing sounds like a dirty carb. I'd start with a full fuel flush and carb cleaning.
It is also possible your carb is adjusted incorrectly. Correct mixture should be approx. 2 1/2 to 2 3/4 turns from seating.
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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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