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5. Idle speed
Caution
Do not adjust idle speed without consulting your genuine dealer.
The XY125GY-4C idle speed is controlled by the ECU. The idle
speed has been properly adjusted upon delivery. Do not adjust
the idle speed. In the event the idle speed is unsteady, zero or
too high, bring the vehicle to a qualified genuine dealer to deter-
mine the possible causes via troubleshooting the EMS system.
Your dealer will check whether the ignition advance angle is
between 0°-15°. If the ignition advance angle is more than 15°, it
indicates the throttle valve’s intake flow at idle speed is insuffi-
cient, and at this point, the idle speed is unstable or null; if the
ignition advance angle is less than 0°, it indicates the intake flow
at idle speed is too high, and at this point, the idle speed is often
as high as 1600 r/min or more. Only under the above two cases
will the technician adjust the idle speed adjusting screw to let the
intake flow reach the specified flow.
Air cleaner element
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