Adjustment
1. Warm up the engine to operating temperature.
2. Turn off all electrical consumers.
3. Disconnect the radiator fan temperature sensor connector and short-circuit both contacts with a jumper to enable the fan to operate continuously.
4. Check the initial ignition timing setting.
5. Connect a tachometer (with the ignition off) and a gas analyzer to the engine. On an engine with a working volume of 1.3 dm³, the gas analyzer is connected to the intake pipe in the engine compartment, which is located on the exhaust pipe and closed with a plug.
6. Increase engine speed to 3000 rpm and hold it for 30 seconds, then return the engine to idle.
7. Take instrument readings.
8. If the idle speed deviates from the norm, use the mixture quantity adjustment screw (1) to set the required speed.
9. If the CO content value deviates, remove the protective cap from the mixture quality screw (2), increase the engine speed to 3000 rpm and hold it for 30 seconds, then switch the engine to idle mode and, by turning the screw, set the required CO level.
10. When changing the idle speed, adjust it with the mixture quantity adjustment screw.
Attention! Readings of the instruments and adjustments can be made only after the readings of the measuring instruments have stabilized.
11. In the absence of a gas analyzer, approximate adjustment of the mixture quality can be made as follows. With the engine running, turn the mixture quality screw inward until the idle speed begins to noticeably decrease, then slightly unscrew the screw in the opposite direction until smooth engine operation is achieved.
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