My boy just received his first trials bike and ran it out of gas and now it wont start. I did get gas out of the fuel line at the carb. It has a rear tank. Any help would be greatly appreciated. 

There's a chance that the last few drops of fuel may have included debris or water. I would start by popping off the float chamber and looking at what's in the bottom - any bits there would suggest the jets may need a clean out.

First, fill the fuel tank up completely, then try.  If not, then there is a hole somewhere in the fuel supply/vent  pipe, which is about two feet long.  Depending on where the hole is, it will either suck air or leak fuel.  Replace.  Or,  there is a hole in the pipe coming from the crank case, which pulses the fuel pump.

 

 

 

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Thanks everyone for some crazy reason I let it sit all night and it started on the second kick