YG125-30A Maintenance Manual
Inspection and adjustment
30
Air filter
Cleaning and replacement of air filter
Remove the left side covers Handle it carefully to
avoid scraping.
Remove 6 screws, remove Air filter cover
Description
1
Remove the filter element and check whether it is
in normal condition. This is a paper filter element,
of which the surface can be cleaned with
compressed air; if the filter element is too dirty,
broken or damaged, replace it;
2
While driving in a more dusty area, the time
period for cleaning and replacing air filter
element shall be shorter.
3
Keeping the cleanness of the air filter may
improve the engine’s operating efficiency and
prolong its life span.
Idle speed
Notice
Check and adjust the idle speed after all other items
of the engine have been adjusted to the specified
ranges.
For this model, the idle speed is controlled by an ECU.
Since the intake flow at idle speed has been properly
adjusted upon delivery, do not adjust the idle speed
adjusting screw as desired. In case the idle speed is
unsteady, zero or too high, find out the possible causes
with the troubleshooting method for the EMS system and
eliminate the trouble.
Under the monitoring of the maintaining and diagnostic
instrument, 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 insufficient, 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
big, and at this point, the idle speed is often as high as
more than 1800 r/min. Only under the above two cases,
unscrew the retaining nut and adjust the idle speed
adjusting screw to let the intake flow reach the specified
flow.
Idle speed
1500 r/min
±
150 r/m
in.
After adjusting toe-in, remember to screw up the retaining
nut.
Air filter cover
Filter element
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