Pocket bike stalling/fuel line clogged?

[John B]

I bought a GP RS-R pocket bike and have had it for about 3 days and it's been working fine until today. I started it up and let it warm up and everything and then took it for a spin around the block and it worked for about a quarter of a mile when it started to stall out and finally die. I could start it back up and idle it but no throttle or it'd stall and die again. I wheeled it back to my house and emptied the gas tank and started it up and idled the rest of the fuel out then took the fuel line out and blew air through it and put it back on and filled it up with new gas and it worked fine and I rode it for about an hour. After I had "fixed" it I took an hour or so break and when I came back to ride it, it was do the stalling thing again. Any ideas what I would need to do to fix this problem?