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i have 2 athearn tunnel motors both been repowered with mashimma motors with the original flywheels . they run smooth at low speeds but when i wind up the speed and when they go around corners they make a lot of noise and the person who remotered them for me says that the flywheels are balanced propelery so my question is , where abouts would this extremly loud noise be comming from and what should i do to fix the problem?? thanks
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