hello forum friends i have a NSR 250 MC18 and I realized that the RC valve is not working. only if I move the finger sideways back to the center ( with the engine running at idle ) . but if I move to the other side there is fixed and does not return to center.

to accelerate or maintain accelerated the engine does nothing.
I already check the throttle potentiometers and the same servo and are in good condition as are the electric motor.

not that problem may be occurring hope I can fix lead in the best way .

greetings and thank you very much.