Alan,
Against the Losi motors that I have the manual for I think it falls between a 3.5 and a 4.5. On no load, the 3.5 does 65,664 RPM on 7.4V which is 8,874KV and the 4.5 does 54,405 RPM on 7.4V which is 6,946KV.
This is only a guide though as different motors compare KV to Winds differently (ask Steve CR next time you are at COBRA as he explains it well!)
Ian
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