Accelerator pump adjustment
If the amount of fuel supplied in one stroke of the accelerator pump piston does not correspond to the norm, i.e. more than 0.9-1.1 cm per cycle, tighten the drive rod nut to bring the amount of fuel back to normal.
Engine idle adjustment
Idle speed adjustment is carried out with a warm engine, with the ignition timing correctly set, with the air damper fully open and with the air filter installed.
Connect the tachometer and gas analyzer according to the operating instructions.
Adjusting screw 1 (see photo) amount of the mixture, set the engine speed in the range of 900-950 rpm.
Check carbon monoxide content (SO) in the exhaust gases and, if necessary, by adjusting screw 2 quality (composition) mixture to achieve a CO content in the range of 1.0-1.5%. If necessary, use screw 1 to restore the set idle speed of the engine crankshaft and put a plug on the quality adjusting screw (composition) mixtures.
Checking and adjusting the starting clearance of the air damper
Remove air filter.
Close the air damper by moving the profile sector «A» (see picture) all the way to the axle.
Start the engine and warm it up to normal operating temperature.
Measure the starting clearance of the air damper, which should be between 3.0-3.4 mm, and, if necessary, adjust it with an adjusting screw «B» air damper diaphragm travel.
When performing this operation on a removed carburetor, proceed as follows:
- connect a manual vacuum pump to the nozzle of the pneumatic actuator of the air damper;
- close the air damper;
- use a vacuum pump to create a vacuum of the required value in the pneumatic actuator of the air damper;
- measure the starting gap of the air damper, which should be in the range of 3.0-3.4 mm;
- adjust the clearance with a screw if necessary «B».
Checking and adjusting the throttle valve starting gap
Remove air filter.
Connect the tachometer according to the instruction manual.
Start, warm up the engine to normal operating temperature and let it idle.
Close the air damper so that the profile sector rests against the axis. In this position, read the tachometer. If the crankshaft speed is not in the range of 3400-3800 rpm, remove the plug from the adjusting screw «IN» (see picture) slightly opening the throttle and turning the screw to achieve the desired engine operation.
Install on adjusting screw «IN» plug.
When performing this operation on the removed carburetor, close the air damper and measure the throttle valve starting clearance, which should be 0.65 mm.
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