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
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here:
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Vriendelijke groeten ;) Ron van Sommeren bei Nimwegen, Niederlande