Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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What is the compression on both sides?
Did you look at the push rods to see if one may be bent? It is not likely but worth a look.
Was the machine running okay prior to hitting the post?
As it sounds there is really nothing to tie the running problem with the hitting of the post. You might try running the engine and spraying around the intake manifold where the carburetor attaches to it and where it attaches to the head and see if you notice any difference in the running.