I agree that the theory that a 4 stroke runs cooler is accurate because it doesn't fire as often as a 2 stroke but I don't think it applies to our model engines. My personal opinion is based on personal observation.

Also, another point which should support my opinion:

IF 4 STROKES RUN COOLER, WHY DO THEY MAKE SUCH POOR HELICOPTER ENGINES? Almost every 4 stroke heli engine (regardless of size) seems to overheat when used in the summer months. Most 4 stroke heli pilots say their engines perform best when it is cold out? Why do 4 stroke heli engines overheat when the 2 stroke ones don't? Don't say it is the size of the motor, if it was the manufactuers would have switched to larger 4 stroke motors for their helis by now. Heli's have cooling fans to cool engines but for some reason the 4 bangers don't run as well.

Any takers?