Ran the Cobra at ARC today and loved it. Handled very nicely and the diff stood up fine to two twenty minutes runs without any problems.
However I did have a problem with the screws that hold the front and rear ends to the chassis coming loose. I tried adding a drop of tyre glue to them before screwing them in. Seemed to help a bit.
Also after a long run my motor was still pretty cool so I'm thinking that I could go bigger on the pinion.
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