Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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When checking for spark did you use a spark tester?
The XT series engine has had some ignition coil problems. The coils get weak and won't fire the plug under compression. I have had to replace a large number of these coils due to this reason. If you don't have a spark tester I would recommend getting one in order to test the spark under compression on this engine.
You may also try to replace the spark plug if you haven't already. Even though it may look good sometimes looks can be deceiving.
Let me know what you find. You can come back here and continue our conversation.
That's the reason I was thinking spark issue. If you spray starting fluid into carburetor it should start and at least burn that out. If you haven't already done so I would replace the spark plug.
I am sorry I had not read close enough your initial post. It says there that you have already replace the spark plug.
Have you by chance hit anything with the blade?
It could be stuck rings if you have no compression. How many hours of run time would you guess this engine has on it? Is the piston moving in the cylinder? You had indicated that the valves were working properly, about the only other thing would be a blown head gasket.