Turn off all electrical consumers, including the air conditioner.
Connect tachometer.
Attention: connect only with the ignition off.
Check ignition timing.
Connect the device for measuring CO. For vehicles with a catalytic converter, connect the device to the CO intake pipe in the engine compartment. The suction pipe is attached to the front exhaust pipe and is usually closed with a blue cap.
Attention: Push the hose of the measuring device onto the measuring tube. Make sure there is no exhaust leakage.
Fully retract the start choke actuator. Check that the air damper (the topmost choke in the carburetor) was completely open. Otherwise, adjust the drive or release the damper. Why remove and put on the air filter again.
Disconnect the breather hose from the crankcase at the cylinder head and plug it with a suitable plug. If the hose is fixed with a clamping collar, use special HAZET 798-4 pliers to facilitate the work.
Start the engine and let it idle Check the idle speed and CO content. Required values in chapter "Repair characteristics".
Adjustment, Keihin-I carburetor
Carburetor Keihin II
Remove protective seals.
Set the required values with the idle speed adjusting bolts -A- and the CO content -B-.
Attention: During the adjustment, the radiator fan must not run.
Insert new fillings.
Disconnect the gauges with the ignition off.
Push the crankcase breather hose onto the cylinder head and secure with a clamp.
Attention: If the CO content now rises, the cause is not an incorrect adjustment, but an enrichment of the mixture from the crankcase due to oil dilution during intensive trips over short distances.
With longer trips, the amount of gasoline in the oil decreases and the CO content returns to normal. This can be achieved quickly with a 30 minute drive or an oil change.
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