motor pre flight check

Joined
Jan 25, 2016
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Hello all
just purchase a Phantom 4 and during preflight test I use my finger to rotate ea blade and notice that one of the motors sorta jumps more than the other 3 - in fact one of the motors you don't feel any jump at all.
Is this normal?
P.S. there is no noise with any of them sorta feels like the magnets but all motors are not the same when rotating
Thanks
Marty b
 

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