this is a stock chinese motor in air (0 load) - thats a 44amp spike
since hi speed motors use even more current, something is wrong. If you have a known good motor lying around, test it seperate from your m4. If it does the same thing then the FCU must be bad.
Something else, without load, the startup buzz will probably spin the gears some.
EDIT: All this is assuming your power source is capable of delivery.