Why won't the motorcycle throttle close properly?

[Simoes]

The reasons why a motorcycle throttle won't close properly are as follows: Acceleration principle: The acceleration process of a carbureted motorcycle is relatively simple. It controls the engine's air intake through the carburetor plunger to regulate engine speed. Normally, under the pressure of the return spring, the carburetor plunger automatically closes when the throttle is released. Causes: When the throttle cable gets stuck internally, the carburetor plunger is excessively worn, or the plunger is installed incorrectly, the carburetor plunger cannot return to its normal position. In this case, the engine speed will increase and cannot maintain normal idle operation.