GM Varajet II Carburettor Check and Adjustment

Checking and adjusting the opening of the air damper

Start and warm up the engine, then stop it. Remove air filter.

Start the engine and let it run at fast idle.

Close the air damper and measure its opening, which should be within 2.8-3.4 mm. If necessary, obtain the desired size with the air damper adjusting screw.

After adjustment, lock the screw with paint or special varnish.

If the adjusting screw of the pneumatic actuator fails to achieve the desired opening of the air damper, replace the pneumatic actuator, as well as the pusher and foot of the air damper actuator.

The opening of the air damper can also be adjusted on the removed carburetor by applying a vacuum to the pneumatic drive with a special device, holding the air damper in the closed position.

Checking the air damper actuator

Using a vacuum pump, apply a vacuum to the pneumatic actuator of the air cushion so that the telescopic thrust of the starting device moves in as far as possible. The pull must remain in this position for at least 30 seconds. If this condition is not met, replace the air damper actuator.

Launcher telescopic arm adjustment

Using a vacuum pump, apply a vacuum to the air damper pneumatic actuator as follows. so that the telescopic thrust of the launcher moves as far as possible. In this position, measure the gap between the choke control lever and the telescopic rod of the starting device, which should be within 0.1-0.3 mm.



If necessary, set the desired gap by bending the end of the telescopic rod of the starting device.

Checking the air damper opening time

Start a cold engine (while the ambient temperature should be about 20°C).

The air damper should open completely after 3-4 minutes. If this happens after more than 4 minutes. replace the cover of the automatic starter.

Adjusting the Position of the Auto Trigger Cover

When installing the cover of the automatic starter, it is necessary to align the mark on the cover with the first scale division after the central division in the direction of the letter «L» (see photo).