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You probably didn't need the extra oil in the tank.
Extremely rich can cause overheat, but that takes a long time, and a lot of carbon residue in the cylinder.
I'd guess improperly set rings, or really screwed up carb.
My two Mirranelli bikes max at 12k, and have handle d 10k+ rpms for thousands of miles. I am surprised yours died without being pushed to the upper RPMs
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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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