Start a warm engine and leave it running. The oil temperature should be approximately 60°C. The choke in the carburetor must be fully open.
Adjust the idle speed with the adjusting screw 3.
Connect the gas analyzer according to the manufacturer's instructions. Measure the CO content in the exhaust gases. The proper value is 2-4%.
If necessary, adjust the CO content using adjusting screw 2.
Check the idle speed again. Repeat the adjustment if necessary.
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