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I hate to say this again, but....did you perform a PDI on this scooter before running it? It is a very necessary procedure when purchasing a Chinese scooter.
You say it has spark....so it probably is fuel starvation. That sounds like fuel or vac lines...sometimes they come from the factory way longer than need be....did you get one pinched under the seat bucket when reinstalling it? Make sure fuel tank vent is working also, yours probably runs to a small plastic canister on the frame near the seat.
I would pull the valve cover, check the gaps. I hope you changed the oil your scooter came with.
50 mph with only 20 miles on the scooter.....not a good idea. But then again, it is your scooter. Good luck finding this bug and correcting it, and do a good PDI, or this will be just the first, of many more to come.
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