Attention! Idle speed adjustment is performed on a warm engine (coolant temperature 90–95°C) with adjusted valve clearances and correctly set ignition timing. The air damper must be fully open.
Attention! Since the adjustment of the idle speed of the crankshaft and the content of carbon monoxide (CO) in the exhaust gases are carried out together, and a gas analyzer is required to adjust the CO content, it is recommended that these operations be performed at a service station.
Note: When adjusting the CO, the crankshaft speed changes slightly, and accordingly, when adjusting the crankshaft speed, the CO content changes slightly.
1. Start the engine. Turn the mixture quantity sensor screw to set the engine crankshaft speed within 750–800 min⁻¹.
2. After this, check and, if necessary, adjust the CO content. The adjustment is made using the mixture quality (composition) screw, which is closed with a disposable plastic plug. It can be removed, for example, with a corkscrew.
3. Consistently check and ensure that the idle speed and CO content in the exhaust gases comply with the standards.