Idle adjustment
Adjust the idle speed with the engine warm, with adjusted clearances in the valve drive mechanism, with the ignition timing correctly set, and with the air damper fully open.
Connect the tachometer and gas analyzer according to the operating instructions.
Check and, if necessary, adjust with screw 1 (see photo) the amount of mixture of the additional idle system, the engine speed at idle is within 900-1000 rpm, while the electric fan of the cooling system should not work.
Adjusting screw 2 (see photo) quality (composition) mixture to set the CO content in the exhaust gases in the range of 1.0-1.5%.
Checking and adjusting the starting clearance of the air damper
The air damper is actuated by small and large pneumatic actuators. A valve is located in the hose connecting them, opening a large pneumatic actuator with a delay of about 2 s.
Remove starter cover.
Open the throttle halfway with the choke fully closed, then release the throttle.
Using a screwdriver, push the pneumatic drive rod 1 to the stop (see photo). In this position, using a rod or drill, measure the starting gap of the air damper, which should be within 4±0.2 mm.
If necessary, achieve the correct clearance with screw 2 (see photo) adjusting the stroke of the pneumatic drive diaphragm.
Throttle start gap adjustment
Remove carburetor.
Completely close the air damper. Half open, then release the throttle.
Using a rod or drill, determine the amount of throttle valve opening, which should be within 0.85±0.05 mm
If necessary, turn the adjusting nut (shown by the arrow in the photo) set the normal throttle opening.
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