Had the same problem with my 70lb Minn Kota Riptide. The 70 lb trolling motors have plastic brush holders and when run at high speed for long periods of time will cause the brush holder to melt to the brushes. The 80lb and 101lb have metal brushes holders and does not have this problem. You can change the brushes and brush holders for around 20 bucks and do it yourself fairly quick. I keep a spare set in the boat
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