How to Adjust the Throttle Idle Limit Screw of Four-cylinder Diesel Engine

Adjust the throttle screw so that the engine speed is slightly higher than the normal idle speed.

Turn the throttle screw of the carburetor clockwise up and counterclockwise down. Adjust the engine speed slightly higher than the normal idle speed, then turn the idle oil concentration adjustment screw left and right, and turn the copper screw with prefix on the left side of carburetor clockwise downward and counterclockwise upward. Find the maximum engine speed for this throttle position. The exhaust sound is ten times a second that ordinary people can hardly hear. Sometimes, after the best adjustment, the concentration of CO is still high. At this time, Paris adjustment method or lean oil adjustment method can be adopted appropriately.