Don't know if this is relevant, but years ago I put a cylinder head temp probe on my motor cycle and it would run the same temp in 'stop and go' as wide open. This surprised me.

My conclusion was that once an air cooled engine reaches operating temperature, it stays there regardless of air flow. I think this applies to most large air cooled engines. The example above does not surprise me as long as the engine has available cooling means (no restrictions).

BUT I do know that effective cooling on model engines is important, especially with cowling.