You may be able to use a broom stick to turn the blower impeller backwards thru the discharge chute. If the blower wont turn then the belt will have to be removed like aandpdan suggested. Disconnect the spark plug before sticking your hands in there.
How to smooth out a 2 cycle engine?
Take out the spark plug. Stick ur thumb in there like a rube. Rotate the engine. If you cannot keep your thumb over the plug hole while ur buddy yanks it - ur rings are fine. There are only 2 compression rings on a 2 cycle and some gouging won't kill em. Once you fire it up she'll smooth out. After all its free right?
Does a pblaster work?
PBlaster works fine.. You might not even have to let it sit for very long maybe even just a little bit. But, make sure the piston isnt welded to the cylinder. If it is you will have to clean up the burrs.