FUEL SYSTEM
4 - 20
ATLANTIC 125 - 200
4.3.5. ADJUSTING THE IDLING MIXTURE
• The idling mixture does not need to be often adjusted.
This adjustment shall be made in full compliance with
some dispositions.
• Before proceeding to carburetor adjustment, make
sure that the following conditions are respected: good
lubrication, valve clearance and timing, spark plug in
perfect conditions, sealed and clean air filter, sealed
exhaust system.
• Connect the exhaust gas tester to the vehicle, i.e.
insert the tester copper probe into threaded pick-up
point before the silencer.
• Close the secondary air inlet (1) on exhaust manifold.
• Warm engine up, running it for at least five minutes at
about 2000 rpm.
NOTE It is very important that the probe be fitted before the
catalytic converter so not to take up exhaust gases already
oxidised by the catalytic converter.
NOTE The exhaust gas tester must be heated in advance
and should ensure gas reading and correct gas capacity
reset. Should these recommendations not be respected, the
reading will not be correct.
• Using a duly-prepared oil filler cap, connect multimeter
thermometer to sump.
• Start engine and wait for oil temperature to be between
70 ÷ 80 °C (158 ÷ 176 °F) to start idling mixture
adjustment.
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