Sounds like you may have a flooding problem, when gasoline gets into combustion chamber in liquid form it causes a hydrolic lock. Try emptying the tank, remove the plug and pull it till all the loquid fuel is out, then put the plug back in and try to start with just the fumes in the talk. If that does not help, remove the muffler and inspect the ehaust ports for carbon build up[ and of courde scoring of the piston or hung ring.
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