Le Di changed the throttle at the age of 9, but it didn't work.

What you want to ask is the reason why Leti at9 doesn't return when the throttle is changed? The throttle wire and throttle handle are stuck and the spring is out of order.

1, the throttle line and throttle handle are stuck: the throttle line is not lubricated, the resistance is too large, and the throttle line is bent.

2. The return spring of the accelerator pedal and the return spring of the accelerator pull rod break off.