The basic oil for a gy6 is 10w40, it does not have to be synthetic or for motorcycles.
That said, I use Mobile Synthetic 4t Motorcycle oil, for no real reason other than it's always on sale at Autozone.
IMPORTANT!
If you use synthetic, DO NOT switch to dinosaur-oil (non-synthetic) as switching between the two can cause resin build up in the crankcase. Granted, that because gy6 use abec-style crank bearings, this is not as large a problem as swapping oil types in an automobile, but is still not recommended.
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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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