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Old 10-20-2013, 09:19 AM
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Default grinding noise in outrunner at mid rpm

I have a Tacan Bigfoot 60 outrunner, that has a grinding noise about midrange in rpms. From 0-4000 it is smooth. From 7000 up it is smooth. The mid range is very noisy and grinding like it is destroying itself. Is it bearings, or maybe bent shaft?