Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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I would like for you to try something for me. If you have some carburetor cleaner in a can, or starting fluid, spray a small burst directly into your carburetor, to see if your engine will start up and run briefly. If you do not have carburetor cleaner in a can, or starting fluid, remove your spark plug and pour about a teaspoon of gas directly into your spark plug hole, re-install your spark plug, then try starting your engine.
Also, if you have a compression tester, or if you can borrow one, check the compression on each cylinder. We need to determine if compression is part of our problem. Although your push rods are ok, your valves could be out of adjustment. Make sure all of your valves are fully opening and closing.
Another thing to check, is your flywheel key. If your flywheel key is sheared, this can prevent your engine from starting. This is rare, but possible.
You and I can continue from here.
Do you have a compression tester?