Install indicator 3 on the carburetor (see picture), resting his leg on the throttle valve of the 2nd chamber.
Turn out the stop screw 1 of the throttle valve so that it does not come into contact with the elements of the carburetor.
Slightly move the throttle actuator lever 2 in the direction of the arrow (see picture). Using the indicator and stop screw 1 of the throttle valve, set the gap «A», equal to 0.05±0.02 mm. Measure the distance with the indicator «b», which should be 13 mm.