80/60cc Flying Horse - brand new bike. Complete newb. The bike was a christmas gift to my 15 yr old son. Thefirst tank of gas was at the break-in oil/gas mix ratio. Filled tank from same gas can. Have not been able to start the bike since that 2nd fill up. Issue seems to be fuel flow. Petcock open, fuel attached to carburetor and fuel will not flow. I remove the line from the carb and the fuel runs fine into a gas can. Any help would be appreciated.