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    Changing Heinzmann brushes?

    I have a 36V EV Global bike "skeleton", and the Heinzmann rear hub motor responds intermittently to even direct voltage, so I suspect bad brushes or contacts. I am game to open it up. Any wise predecessors with critical "do's and don'ts", and anyone know if the brushes are a commonly available...
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    Newbie Here!

    From across the pond, no less- Fountain Hills, Arizona. Larry Ward, retired physician. I have owned an EV Global Motors EBike 24V since 1999. I am currently converting it to one of the China- supplied 100W48V brushless motors, rear wheel drive, and a 20AH lithium battery. I live in a hilly...