Unless you think you damaged the motor, there is no reason to replace it.

I presume you have already checked the trim on the elevator to be sure it is even with the h-stab.

Is the circut board solid in its mount? If it has broken lose, when you move the sticks, you will move the board rather than the surfaces.

Was the battery thrown out of the plane? If so, there may be a partial break of the wire that connects the battery to the control board and motor which would inhibit current flow, giving you a lack of power.

Is the prop tight on the motor shaft?


Just brainstorming here.