CB 190 can't get off at idle speed with the throttle closed.

The throttle is out of order Throttle failure will lead to the error of throttle opening, reduce the sensitivity of throttle, and fail to close normally at idle speed, resulting in abnormal idle speed.

Idle speed control valve is faulty. If the idle valve fails, the idle speed will not be adjusted correctly, resulting in unstable idle speed and inability to reduce it.

Water temperature sensor failure. When the water temperature value obtained by the engine computer is lower than the actual value, the idle speed of the engine will be high, so it is impossible to reduce the idle speed of the car by loosening the throttle.

This situation belongs to the slow oil return of motorcycle. The reasons for the failure are:

Throttle line fault. The oiler is faulty.

The carburetor throttle is too dirty. If the oiler and throttle pipeline are normal, it can be solved to clean the oil sludge on the carburetor throttle surface.