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rear motor noise

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I am hearing what sounds like loose magnets/ball bearings when rear wheel turns on Thin 7.  Can anyone advise what this might be?   Also seems like very poor response from power assist level;  delayed and sometimes no power at all?

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thank you very helpful..  Clear I have loose magnets.


I have read where replacing with an upgraded motor might be wise.  Do you know of right replacement motor upgrade for a Thin 7?

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