The valve lash on these engines are adjusted cold. Intake .003 exh. .005 Try this method and let us know the results. The head with all its components are made using several different metals all with different expansion rates. I cannot give you an answer as to why but any small engine of this type the instructions call for valve adjustment to be done on a cold engine. And my Honda manual says to never adjust valves on a hot engine. Try adjustment on a cold engine (ambient temp) than let us know the results. TOM
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