The 3s voltage can cause the motor to exceed the RPM limit for the rotor, causing it to self destruct. It has nothing to do with heat. Almost nobody on here that races uses is motor, as the only class that it is legal in would be modified. Some bashers may use it, though. With the correct gearing, the 5700kv motor can be just as fast, and you can use 3s with it.
*** The Gate - Celebrating 7 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car