Most likely it could be dirt within the motor. Does your Evo fly normally?When I was changing the props on my Evo I noticed that one of the motor is stiff and doesn't spin as freely as the other motors. Any idea as to why?
Just as a safety measure, use canned air to blow the motor of any debris. If your drone is flying normally, I would leave it as is. If you notice any change on it's behaviour, then worry about it.Yes, I flew it yesterday and all seemed good.
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