ORIGINAL: jester_s1
Unless you are over amping the motor or have it enclosed in a cowl that won't let air circulate around it, it should be able to run with the recommended prop without overheating. If it is, then something is wrong.
Careful.
Spec'd props WILL in most cases overheat a motor that is run at full throttle on the ground.
In the air the motor unloads pulling fewer amps than it does on the ground, and cooling is far better... so manufacturers spec their props and motors for the "sweet spots" where efficiency tends to be better.