Air flap adjustment
Remove air filter.
Pull out the choke control until the mark on the cam is opposite the fast idle adjusting screw (see photo).
Disconnect the hose from the air damper actuator and connect the hand pump hose to the nozzle. Using a pump, create a vacuum in the pneumatic actuator of the air damper.
Measure the opening of the air damper, which should be in the range of 2.8-3.4 mm. If necessary, achieve the required ajar opening with the adjusting screw «A» (see photo) air damper actuator.
If the measured opening is too small, then before turning the adjusting screw of the pneumatic drive, bend the end of the rod «B», and after adjustment, bend it again.
Accelerator pump adjustment
Before proceeding with the adjustment of the accelerator pump, check the condition of the pump piston plate, the defect of which is often the cause of the pump malfunction. If poppet is damaged, replace pump piston assembly.
Start and warm up the engine.
Remove air filter.
Make sure that the fuel supply by the pump is uniform by moving its piston to full stroke several times. If the fuel supply is uneven, flush the accelerator pump.
Check pump stroke (size «A», see photo), by drowning it with a screwdriver; the piston stroke should be within 7.8-8.2 mm. If necessary, adjust the piston stroke by bending the drive lever in the groove area on its upper surface.
Adjusting the needle valve and setting the fuel level in the float chamber
Remove air filter.
Remove the carburetor cover.
Carefully remove the carburetor cover gasket.
Remove float and needle valve.
Replace needle valve (see photo).
Measure the gap between the bracket and the float bracket with a flat feeler gauge, which should be 0.2 mm. If necessary, adjust the gap by bending the float bracket.
Reinstall the needle valve, float and float shaft. Lightly press the float bracket to close the needle valve without lifting the float shaft.
Measure the distance between the upper mating surface of the float chamber and the float, which should be within 7.5-8.5 mm.
If necessary, adjust this distance by bending the float bracket.
Install the carburetor cover gasket.
Install the carburetor cover.
Install the air filter.
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