Contents: Setting the fuel level in the float…↓ Adjusting the starting device ↓ Adjusting engine idle speed ↓
Setting the fuel level in the float chamber of the carburetor 21051-1107010
1 – float; 2 – carburetor cover; 3 – gasket; 4 – caliber; 5 – needle valve
Setting the fuel level in the float chamber
The required level is ensured by the correct installation of serviceable elements of the locking device.
(The text is on the website: «VazBook.ru»)
The correct installation of float 1 is checked with gauge 4, for which it is installed perpendicular to cover 2 with gasket 3, which must be held horizontally with the floats facing up.
Adjusting the starting device
When turning lever 4 (see Fig. Carburetor starter 21051-1107010) control the air damper 5 completely counterclockwise, the air damper should be completely closed under the action of spring 7. If the damper is not closed, eliminate the cause of the jamming.
With the air damper fully closed, manually press the rod 3 of the starting device until it stops. In this case, the air damper 5 should open by 3.0 mm (starting gap B). If necessary, adjust the gap with screw 2.
Throttle valve 12 of the first chamber with the air damper fully closed should be slightly open by 1.1 mm (starting gap C). Adjust this gap with screw 10.
Carburetor idle speed adjustment screws 21051-1107010
1 – mixture quantity adjustment screw; 2 – mixture quality (composition) adjustment screw; 3 – sealing ring; 4 – adjusting screw plug
Adjusting engine idle speed
The idle speed adjustment elements include the mixture quality (composition) adjustment screw 2 and the mixture quantity adjustment screw 1. The adjustment screw 2 is covered with a plug 4. To access the screw, it is necessary to break the plug.
Idle speed adjustment must be performed on a warm engine (coolant temperature 90–95°C) with adjusted valve timing clearances, with the ignition timing angle set correctly and the air damper fully open.
1. Using the mixture quantity adjusting screw 1, set the engine crankshaft speed to 750–800 min⁻¹ on the stand tachometer.
2. Using the mixture quality (composition) adjusting screw 2, achieve a carbon monoxide (CO) concentration in the exhaust gases within the range of 0.5–1.2%, reduced to 20°C, and 760 mm Hg, with the given position of screw 1.
3. Using screw 1, restore the crankshaft speed to 750–800 min⁻¹.
4. If necessary, use adjusting screw 2 to restore the CO concentration to 0.5–1.2%.
5. After completing the adjustment, sharply press the throttle pedal and release it, the engine should increase the crankshaft speed without interruption, and should not stall if it decreases. If the engine stops, use screw 1 to increase the engine crankshaft speed within 750–800 min⁻¹.
6. Install plastic plug 4 into the hole for mixture quality adjusting screw 2.