Air damper starting gap adjustment
Pull the choke control fully out; at the same time, the air damper control lever should be at the stop.
Press the starter rod all the way down.
Measure the starting gap of the air damper with a set of feelers, which should be within 4.6±0.15 mm
If the starting clearance of the air damper does not fit within the specified limits, achieve the required clearance by bending the adjusting fork on which the bent end of the starting device stem rests (see photo).
Air damper starting gap adjustment
Adjustment of the opening of the throttle valve of the 1st chamber at idling of a cold engine
Start and warm up the engine.
Attach a tachometer and remove the air filter.
Pull out the choke control knob fully.
Fully close the choke by turning the control lever.
Measure the engine speed, which should be within 4200±200 rpm.
If necessary, set the required engine mode by moving the throttle control levers of the 1st chamber.
Adjustment of the opening of the throttle valve of the 1st chamber in the idling mode of a cold engine
Throttle opening adjustment of the 2nd chamber
The throttle position of the 2nd chamber is adjusted at the factory, but if the adjustment is violated, the eye can be restored as follows:
- remove the carburetor;
- fully open the air damper;
- set the throttle valve of the 1st chamber to the idle position and fix it;
- unscrew the restrictive screw of the throttle valve of the 2nd chamber so. so that it moves away from the throttle control lever of the 2nd chamber. Then screw in the limit screw until it touches the lever, then screw in the limit screw an additional 3/4 turn;
- lock the limit screw with a drop of paint or a special compound;
- put the carburetor in place;
- adjust the idle speed of the engine.
Accelerator pump adjustment
Remove the carburetor.
Place a beaker with a funnel under the carburetor.
Slowly fully open and close the throttle valve of the 1st chamber ten times, thereby actuating the accelerator pump.
Measure the amount of fuel leaking into the beaker, which should be within 7.8±1.2 cm3, i.e. 0.78±0.12 cm per cycle.
In case of deviation from the norm, achieve the required performance of the accelerator pump by changing the position of the stop of the pump drive lever.
Engine idle adjustment
Before adjusting the engine idle speed, perform the following operations:
- make sure the choke control knob is fully depressed;
- warm up the engine. To do this, let the engine run at about 2000 rpm until the thermostat opens. In no case should you warm up the engine at idle, because if the engine runs for several minutes at idle, then the measurements of the carbon monoxide content in the exhaust gases will be distorted;
- check the cleanliness of the air filter element and, if necessary, replace it with a new one (do not remove the air filter when adjusting the engine idle);
- check the operability of the ignition system and the setting of the ignition timing;
- check for air leaks, paying particular attention to the connection of the vacuum hoses and the condition of the throttle body gasket;
- make sure that there are no significant exhaust gas leaks in the exhaust tract;
- make sure that powerful current consumers (electric fan of the engine cooling system, headlights, rear window heating element, etc.) off.
Adjusting screw for the amount of mixture (see photo) set the crankshaft speed within 700-800 rpm.
Precise adjustment of carbon monoxide content (SO) in the exhaust gases is carried out only with the help of special equipment. If it is not available, it is allowed to adjust the CO content, acting as indicated below.
Idle mixture adjustment
CO adjustment without gas analyzer
Set the engine speed to 700-800 rpm.
Remove the plug of the quality adjustment screw (composition) mixtures (see photo) and, turning it, achieve the maximum idle speed of the crankshaft.
Quality control (composition) idle mixtures
With the adjusting screw for the amount of the mixture, restore the crankshaft speed within 700-800 rpm. Repeat the above operations until stable engine idling is obtained.
Adjusting screw quality (composition) mixture, reduce the engine speed by 50 rpm.
Put on an adjusting pint of quality (composition) stub mix.
Adjusting the CO content with a gas analyzer
Set the engine speed to 700-800 rpm.
Remove the plug of the quality adjustment screw (composition) mixture and, turning it, achieve the CO content in the exhaust gases in the range of 0.5-1.5%.
If necessary, restore the crankshaft speed to 700-800 rpm with the adjusting screw for the amount of the mixture.
Repeat these operations until the specified values of the crankshaft speed and CO content are obtained.
After adjustment, replace the cap of the quality adjustment screw (composition) mixtures.
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