Cooling the motor between rounds is quite important, otherwise the motor temps will get higher as the night/day progresses. I purchased a 12v 4inch fan from maplins, makes a big difference to motor temps.
What speedo are you running?
I tried drilling holes in a shell, found it more effective to cut the front and rear away to allow air to be channeled into the body and also exit.
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Kyosho RB6
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