High idle adjustment
1. Attach a tachometer to the engine (see chapter "Engine adjustment").
2. On engines 1.1 and 1.3 l (since August 1979) with manual choke, adjust the choke cable as described above.
3. Pull out the choke button all the way, push it back to the first detent position.
4. Open the air damper by hand by turning the damper shaft (pic. F:9). Start the engine and note the high idle speed on the tachometer.
5. If the high idle value is out of range (see section "Technical data"), remove (in the presence of) cap and adjust the high idle by turning the throttle stop screw (Ah, fig. F:9).
On engines with automatic choke, start the engine and set the throttle stop screw to the third stage of the high idle cam (Ah, fig. F:10). If the value of the increased idle speed is outside the specified limits (see section "Technical data"), remove the protective cap and adjust the idle speed by turning the limit screw. There must be a clearance of at least 0.2 mm between the end of the limit screw and the high idle cam with the choke fully open (B, fig. F:10).
Air damper starting gap
1. On Solex PIC carburetors with manual choke, pull the choke button fully out to move the high idle cam to the highest position. Remove the bimetal spring cover from the air damper actuator housing
2. On Solex PICT carburetors with auto choke, remove the bimetal spring cover with water box from the auto choke body and close the choke.
3. Push the air damper unloader diaphragm rod all the way into the diaphragm housing (pic. F:11).
4. Check the clearance between the upper edge of the air damper and the wall of the mixing chamber using a drill shank of the appropriate diameter (Ah, fig. F:11) - see section "Technical data".
5. Adjust the clearance if it is not within the specified limits by turning the stop screw in the diaphragm housing (B, fig. W: 11).
6. Replace the bimetal spring cover. Make sure the bimetal spring engages with the choke lever. The mark on the cap should line up with the mark on the carburetor body.
Fuel cut-off valve
The solenoid shut-off valve for shutting off the fuel supply is used to shut off the bypass (bypass) idle channel when the ignition is turned off to prevent further engine operation (so-called "antidiesel"). The valve is screwed into the side surface of the carburetor body under the idle speed adjusting screws.
When the ignition is turned on, the valve works with a well-audible click. When removing the valve, the plunger must be recessed inward by 3-4 mm. If the valve does not work, replace it.
Throttle heater
On models with engines 1.1/1.3 l (since July 1978) a carburetor is installed with an electric heating element that serves to heat the throttle zone. The heater is located under the air damper housing next to the accelerator pump.
To test the heating element, disconnect its wire from the connector at the top of the carburetor, then connect a test lamp between the heating element terminal and the positive battery terminal. The lamp should light up, otherwise replace the heating element.
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