To check, you must perform the following operations:
Remove air filter.
Remove the fuel pump relay connector and bridge terminals 7 and 8 with a piece of wire to create pressure in the fuel system by the pump.
Press on the flow meter (4) down. At the same time, constant resistance is felt, without jerks.
Quickly lift the flow meter flap up. The damper moves freely, due to the fact that the control piston (2) lifts up from the adjusting lever (1) with slowdown.
If you move the adjusting lever or the distribution piston with difficulty or jerks, replace the fuel distributor.
The surface of the flow meter flap must be aligned with the upper surface of the start of the bevel on the intake manifold. It is allowed that the surface of the flowmeter damper is no more than 0.5 mm higher.
When the flow meter damper is correctly adjusted, there should be a gap of 1-2 mm between the adjusting lever (1) and distribution piston (2). The gap is checked by lightly pressing the flow meter shutter until a slight resistance is felt.
To adjust the position of the flow meter damper, perform the following operations:
If the position is too high, tap the punch down on the guide pin (see arrow).
Attention: Do not drive the pin too deep.
With the choke position low, remove the fuel mixture adjuster and lightly knock out the guide pin from below.
Attention: try. as little as possible to resort to adjusting the pin.
Install the air filter and adjust the idle speed of the engine.