I have run the Wraith 7K with Quark and now run the Permax 400/4D with Quark. There is a tiny bit of cogging at low speeds with the Permax motor but I have not yet played with the Quark's settings and also have just bought some LiPo's which might improve things but haven't run them yet as my transmitter has died so just waiting for the warranty man
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With the Wraith motor I had the Quark get very hot and cut out with certain gear ratio's. The Permax seems much better suited and can be geared to rediculous ratio's while still running cool. Much prefer the Permax motor for that car.
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