The motors run very similar, we use them interchangeably in monthly race classes for hardbody cars (180-200 gram) and sub 100 gram flexi cars. By design, the Proslot 4000 series FK is a sealed motor to make them equal and not rebuilable, but.......different armatures are made that fit both motors. Due to the slight can mass difference, the Hawk motors rev slightly higher and should be geared different than the Proslot motors.
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