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When I first got mine they went really straight but after one or two charges they would veer to one side. After correcting it with the trim control it would fix it but only at low or high speed not at both. I oiled the gears in one and the next time I tried it one motor had noooo power. I tore it apart and couldn't determine if it was the pinion slipping on the motor shaft or if the motor was just plain shot. That was 2 weeks ago and I haven't touched it since.
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