2. Connect the tachometer and gas analyzer to the engine in accordance with the manufacturer's instructions.
3. Start the engine and let it idle. If the engine speed is outside the specified limits, adjust it using the throttle stop screw (see photo).
Photo 15.3. Throttle valve stop screw (shown by arrow) on a Pierburg carburetor.
4. Having achieved the required idle speed, check the CO content in the exhaust gases. If it is outside the specified limits, adjust it using the quality screw, which is located under the plug (see photo).
Photo 15.4. The quality screw is located under the plug (shown by arrow) — The carburetor has been removed for clarity reasons.
5. Having achieved the desired mixture composition, adjust the idle speed again (if it is needed).
6. Once both parameters are correctly adjusted, turn off the engine and disconnect the tachometer and gas analyzer.
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