How to tell if somethings off with a motor?

I have a motor on my micro-h quad right now that when you flick it, it only spins like one rotation, but the other ones spin much more. However, it flies fine and isn’t making a weird sound. Is there motor damage?

Give this a try:

http://community.micro-motor-warehouse.com/t/tips-tricks-reviving-a-stiff-brushed-quad-motor/600?u=masterrc_student

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