Note: The exhaust gas adjustment screw is covered by a protective cap that can be removed with pliers or a screwdriver.
Sometimes this can be done differently by screwing a self-tapping screw with a diameter of 2 mm into the cap and then pulling out the self-tapping screw along with the cap. The protective cap is destroyed. After adjustment, the adjusting screw must be closed with a new cap (should be included in the spare parts kit). If the carburetor has an adjusting screw with a protective head, then a special key TOYOTA ET Nr. is required to adjust the composition of the exhaust gases. SST 09243-00020.
Attention: When working with a carburetor, it is necessary follow the rules of cleanliness.