my GF has a cheap, we don't know who the manufacturer is, Chinese scooter, 49cc, it ran good, till it didn't, she thinks it just needs a carb..... I think it needs a motor, she had the thing pegged all the time, I clocked her almost 60mph, down a local hill (I rode it once down that hill @ 35 and felt sketchy)
I would prefer she take it to the scrapyard, and get a name brand scooter that has a dealer/parts network, a little bit bigger, as big as a 250