If you are using the kit speed control then a Tamiya Sport Tuned is safe but pricey. I have run a HPI Firebolt 15 turned brushed motor with a stock speedo but it did melt the speedo case eventually (I think they're only rated down to 23 turns). If you want to shell out £60 or so the Hobbywing EZrun 13t brushless speedo and motor combo is good.
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