It would be interesting to learn if model engines act like full scale engines. Does peak rpm = peak temperature? Does the temp start to decline as you go to the lean side of max rpm? Are two stroke engines totally different than full scale engines? How about the four strokes? They are lubed the same as the two strokes.
The peak RPM of our models is a combination of mixture and timing advancement. Rich mixtures cools the plug and retards the ignition and lean mixtures advance the mixture. So peak RPM is not usually peak temp.