Motor Issue

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I'm getting a little resistance on One motor causing the bird to vibrate a little and slightly drifting on my Phantom 2, Has anyone ever experienced this ?
 

N017RW

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If you're referring to something other than the notchy or cog-gy feeling when you rotate by hand, than it must be a bearing, foreign material in the motor, or something rubbing on the outrunner.
 
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it is the notchy feeling but on this motor it more noticeable, it spins freely Slightly Stiffer than the others . Maybe I'm just paranoid had a crash last week don't want another one. It really nothing to switch out the motor if need be
 

N017RW

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Notchy is generally Ok. Differences in magnets and other manufacturing process vary as does this notchy-ness.
The best test is resultant heat from flight. After landing test motor temps. They should all be about the same.

This can be done by just feeling each as they should NEVER be hot enough to burn skin as the plastic [shell] would melt first.
 

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