Like mentioned above, I would agree on the fuel problem. Small engine shops love spring because with the nicer weather brings a flood of small engine powered tools that have sat over the winter with fuel in them. Simply dumping the gas and adding fresh can sometimes fix the problem, but with ethanol in the fuel now it causes havoc with gaskets, fuel lines, and other assorted fuel related problems.
You can try dumping the fuel, and adding a fresh batch of fuel doctored up with a small dose of fuel treatment, I have found that Berrymans B12 Chemtool one of the best for removing the varnish and sludge that develops over a winter.Get the thing running as best as you can, then leave the machine overnight after the fresh fuel has gotten through the system to work on the deposits. Then try it again tomorrow.
If that doesnt help matters, then you may need a rebuild kit and a thorough cleaning of the carb. And replace the fuel filter while you are at it.