Goedendag ;-)

"Some of us may have run across a brushless motor that has questionable
operation, perhaps after overheating it, or after crash damage. It may even
have come from a swap shop. The question is "Do you want to connect it to an
ESC" and risk possible damage to the ESC?"

Several useful test methods described here
http://www.wattflyer.com/forums/showthread.php?t=35216
and here:
http://www.rcgroups.com/forums/showthread.php?t=240993

Vriendelijke groeten ;) Ron van Sommeren
bei Nimwegen, Niederlande