LOL, so does anyway know why my motor acts like that ?

Can you check all the wires? (sensor and main leads from the esc to the motor) sounds like one of the wires is broken or such. it might be ESC related too, it's not said that the problem is motor-based.

Yeah, check the small sensor wires, especially where they go into the motor. Not sure if your motor has the detachable sensor wire harness that has plugs on each end, if so buy another and try it out. Cheaper fix than a new motor. Also check al of the solder joints and plugs if you have any. I have had numerous cogging and startup issues that all ended up being the motor to esc plugs. Good luck

Novak's international distributors are expected to follow the same non-warranty replacement procedures in their markets as we do here in the US.

You can email for a diagnosis of your problem and we can help you with your distributor. If the items were not purchased from an int'l Novak distributor, we'll see what we can do to help.

(Please, do not use a "Hotmail" account, as it will probably fet caught in our spam filter.)

Might be the ESC, I've had 2 HV's fail running the 4.5 motor. Both times they said locked rotor. Both times novak said the motor was fine and replaced the esc.