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  1. G

    m620 reduced power issue

    I have to try this method :) My friends and I have exactly the same symptom. A 52V battery fully charged to 58.8V can squeeze the full 30A from the motor. If the voltage drops below 48V, the controller cuts the power to 600W, this also applies to the throttle. When the voltage is below 44V, the...
  2. G

    Ultra Tuning: Where other guides go wrong

    In my opinion it's motor speed ranges. Have checked this - if i ride without magnet mounted in wheel, engine works as usual and controller has no information about wheel and bike speed. I've been riding ultra with stock controller and 14s7p battery for only a few days and I'm trying to find the...