Hi,
It was once common opinion that you should never run a brushless motor like yours at high speed with no load attached. I have no idea if this is still true, if it was ever true or why it might be so, but please do your own research on this before you possibly kill an expensive motor.
Also brushless motors have a KV rating which is the number of thousands of RPM the motor will do per available volt, this should be easy to look up.
Duane B