Remove air filter.
Press the throttle control lever several times; at the same time, a jet of fuel should come out of the two nozzles of the accelerator pump.
If this does not happen, clean the atomizers, wash them with gasoline and blow with compressed air, and also check the condition of the diaphragm, which should be intact, without damage, (when assembling the accelerator pump, direct the conical helical spring with a small diameter towards the diaphragm).
Move the throttle valve actuator until the idle mixture amount adjusting screw stops in the throttle valve control lever; while the accelerator pump drive lever should barely touch the plunger.
If necessary, use nut 1, which determines the start of fuel supply by the accelerator pump, to achieve the desired result.
With the fuel supply adjusting screw 2, achieve a gap between it and the accelerator pump cover within 3.5±0.2 mm, thereby ensuring the required fuel supply by the pump, provided that fuel is supplied uniformly by its atomizers.
If in doubt about the correct performance of the accelerator pump, remove the carburetor.
Attach the fuel tank 2m above the carburetor and connect the tank hose to the carburetor inlet fitting.
Place a beaker under the carburetor chambers and check the performance of the accelerator pump for 1 cycle by slowly moving the throttle control lever several times until it stops. To increase the pump performance, unscrew the adjusting screw 1, and to decrease it, screw it in.