RC-FIEND....

....you are missing the point. Downunder is not trying to break-in his engine.
He is purposely running the engine excessively rich to disspell the "sky is
falling crowd's notion" that running a new ABC engine in a "four stroke mode"
will cause engine failure.

This theory or contention is patently false, plain and simple....

....or as I call it...."hogwash".

FBD.