First of all, this is EXACTLY why you DO NOT ride at full-throttle, high RPMs are when 90% of fatal engine problems happen. The gy6 engine does have an oil-pump, but it is very much a non-sump oil system. (yes I know the inlet could be technically called a sump) The engines starve for proper lubrication at high RPMs.
As to what possibly you have blown, you won't know until you disassemble the engine. I'd say it is most likely you dropped a valve or blew an engine bearing or rod/rod pin.
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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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