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When I see operations with leaning WOT is very common. WOT rich to accelerate, then lean down to enough horse power to keep you moving at an acceptable speed. At the same time watch the EGTs plummet. At 20 hp he is down around 15% hp egt should be nowhere near the point of melting deposits on the exhaust valves or heating up the exhaust manifold. Unless it's is not running lean enough? Putting the timing into the point where the most mechanical energy is extracted seems like a good way to go.
Please note that I am not trying to argue a point here I am trying to reconcile my knowledge of leaning in aircraft with the possibility of doing so with an automotive system. With an engine with good mixture distribution the bottom threshold for lean is when cylinders start not firing due to a mixture too lean to support combustion and the thing starts missing. At that point the EGTs are up to several degrees lean of their hottest.
on an aircraft engine you are typically running at 50-60% of max rated in that configuration.
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