[E-Revonut]

I have seen brushed motors being tested by slipping a fan blade on the shaft, just something to put a load on the motor. A pinion offers virtually no resistance to a motor on it's own. A nitro motor should also never be run without a load as it will over rev and that could be very dangerous. A snowmobile motor is the same, don't run it without a belt on the clutches, I've blown apart belts and let off the throttle. The motor doesn't come back to idle, it will free rev even with no throttle.