9. By turning the adjusting screws in, you increase the adjustable value; by turning them out, you decrease it.
Photo 6B.9. Quantity screw (shown by the arrow) (2B6 carburetor).
Figure 13.33. Quality screw (2B6 carburetor) (section 6B).
10. During the regulation the following conditions must be met:
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- The engine must be at normal operating temperature;
- The throttle lever should touch the stop screw (the air damper is fully open) all electrical consumers (headlights, heater, etc.) must be disabled;
- The crankcase ventilation hose must be disconnected from the air intake hose and its connection point must be blocked;
- The ignition must be adjusted correctly;
- The vacuum hose must be disconnected.
11. Upon completion, connect all hoses and disconnect the devices used.
Note: After connecting all hoses, engine speed will increase by approximately 150 rpm. If the CO content also increases, this does not mean the adjustment was performed incorrectly. After a long drive at high speed, the fuel vapor content in the crankcase oil will decrease and the CO content in the exhaust gases will return to normal.
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