I can't tell you what my motor temperature is after a 5-minute qualifier or main, but my 501X is powered by a Orion Revolution (11x2) with 87/15 gearing and no serious heat issues.
Make sure you have the vent holes cut/trimmed out of your body and maybe try lowering your pinion gear by one tooth.
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Tamiya America - Trakpower - 92Zero Designs
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