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Originally Posted by nl12
Maybe you have a different kv motor than you think and it is hitting the 42000, maybe lehner mismarked the motor, stranger things have happened. Try the motor with a different controler like a 9920 unloaded and see if it does the same thing, if it does then something is definately wrong with the motor, if it works fine--maybe its your controler, maybe it is the mismarked kv issue. I dont know how to test the kv of a motor if anyone does that could help eliminate one potential problem.
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Good idea about the mismarked motor but it can't be the 42K limit because it happens at 32.1mph(GPS) on 12.6:1 gearing which is less than 30K rpm i think.It will repeatably hit almost exactly that speed before it happens.