(b) When the normal operating temperature has been reached, allow the engine to idle. Turn in the dashpot adjusting screw until it no longer compresses the dashpot stem. It is important that the adjusting screw does not interfere with the normal idle setting of the carburetor. If the adjusting screw prevents the throttle lever from reaching the idle position, an excessive idle speed will result. It will then be impossible to obtain an accurate idle speed adjustment.