Losi
It's the Losi excelorin set...they're renowned for it. I have one (no longer in use) and another guy at our club had one, we both experienced the same issue. Not sure whether it's the speedo or the motor or a combination of the two together but when my speedo was attached to a different Losi excelorin motor is seemed fine (apart from the fact that it was either full power or no power).
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