MMM 2200KV sounding like a Electric Drill ??

[JERRY2KONE]

Yea I do not see any reason to panic about this. Testing a motor of any kind with no load is a fairly common practice in industrial areas. I am sure that most motors are under rated as to their true top RPMs, so you would never want to wind any motor out without being attached to something. The outcome could be catostrophic to the motor and even dangerous. The sound you were hearing was directly related to the fact that you were running it in your hand. Most likely the motor is fine.