Photo 10.1A. GM Varajet carburetor - quantity screw visible (A) and fast idle adjustment screw (IN).
Photo 10.1B. GM Varajet carburetor - additional visible (bypass) quality screw (WITH) and the place where the main quality screw is located (D), as well as the coolant hoses and vacuum hoses that go to the rear of the carburetor.
2. Provided additional (bypass) mixture adjustment screw. It is not closed with a plug, because... It is with its help that the idle speed of the engine is regulated.
3. Before adjusting the carburetor, check that the engine is at normal operating temperature, the ignition is correctly adjusted, the spark plugs have the correct spark gap, the choke is fully open, and the throttle cable is correctly adjusted.
4. Connect a tachometer to the engine in accordance with the manufacturer's instructions.
5. If the idle speed is outside the specified limits (see Specifications), adjust them by turning the additional (bypass) quality screw. This will not affect the CO content in the exhaust in any way.
6. After overhauling the carburetor or replacing any of its important parts, the idle speed and mixture composition should be adjusted.
7. Connect the tachometer and exhaust gas analyzer in accordance with the manufacturer's instructions. Connect a vacuum gauge to the distributor at the vacuum tapping point.
8. Remove the plugs.
9. With the engine at normal operating temperature, check the CO content in the exhaust gases. If it is outside the acceptable limits, adjust it using the main quality screw. Turning the screw clockwise decreases the CO content, counterclockwise increases it.
10. Reduce idle speed to 600 rpm to check vacuum. If it goes beyond 0-20 mbar, remove the cap from the quantity screw and use it to achieve a vacuum of 10 mbar. Return the speed to the desired value using an additional (bypass) quality screw.
10. Upon completion of the adjustment, install new plugs on the screws.
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