for a 5 minute all out WOT sesh, 160 degrees F is okay for most brushless motors. just keep in mind both ESC and Motor temp should be within 20 degrees without one of them getting hotter than 160. i carry a temp gun whenever im racing or bashing.For 13.5t BL, 18tooth, or 19tooth instead of the provided 16 will do just fine.
For a20t brushed, I’d keep it at 18tooth. At least that gave the best performance without overheating, with the Kyosho G20 motor I tested. 19t will also work, but keep an eye on the temp.
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