The throttle valve clearance can also be adjusted by means of the idle speed of the cold engine. The advantage of this method is that the carburetor does not need to be removed to make adjustments. Cold engine idling speed should only be checked or adjusted when the engine's throttle response is poor or when the cold engine responds poorly to pedal input.
Warm up the engine to operating temperature, engine oil temperature not less than +60°С.
With the ignition off, connect a device for measuring the engine speed.
Check idle adjustment see above.
Check ignition timing, see chapter «Ignition system».
Open the throttle by pressing the gas pedal and bringing the crankshaft speed to 2500 1 / min. Stepped washer -1- push down to the stop (arrow) and move the throttle back (the adjusting screw is on the second, higher step of the stepped washer).
In this case, the crankshaft speed must correspond to the so-called cold engine speed at idle. The prescribed value is 1700±50 1/min.
If necessary, adjust the cold engine speed with the adjusting screw -2-.
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