Sounds like bad rings, or other severe engine damage! Don't buy it unless you are ready to swap out the engine, 2ts are notorious for becoming ruined if they have inner engine damage.
The noise is clearly bearings, which 99% of the time fail because the bike was run out of 2t oil.
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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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