Remove the carburetor.
Fully close the choke by locking the throttle control sector on the fourth ledge.
Measure the gap between the throttle valve and the wall of the 1st chamber, which should be within 0.25-0.36 mm.
If necessary, set the required clearance with the support screw on the throttle control sector.
Install the carburetor.
Start and warm up the engine.
Close the choke by locking the throttle control sector on the third ledge.
In this position, check the speed of the crankshaft at fast idle, which should be between 1100-1300 rpm.