The Honda GX120 is a small, four-stroke, air-cooled gasoline engine commonly used in various applications such as generators, pumps, and small machinery.
Typically, the throttle on small engines like the GX120 is controlled by a mechanical linkage system. The throttle lever or control mechanism is connected to a throttle plate or butterfly valve located within the carburetor or throttle body. When the throttle lever is pulled or pushed, it moves the throttle plate, regulating the amount of air and fuel mixture entering the engine.
To close the throttle on the GX120, there may be a spring mechanism or return spring attached to the throttle linkage. When the rider or operator releases the throttle lever or reduces the input force, the spring pulls the throttle plate back to its idle or closed position, decreasing the airflow and reducing engine speed.
It's important to note that the specific design and components of the throttle control system can vary depending on the engine model and application. For accurate and detailed information about the throttle mechanism on the Honda GX120, it is recommended to refer to the engine's user manual or consult official Honda documentation.