18-20
DF90/115/140 “K8” (’08) MODEL
PERIODIC MAINTENANCE
IDLE SPEED
Change the idle speed adjustment procedure as following:
The idle adjustment of 2008 model can be performed by fixing
duty of IAC valve as well as DF150 – DF250 model.
NOTE:
• Before checking idle speed, engine should be allowed to warm
up.
• Check and/or adjust idle speed after engine speed has stabi-
lized.
• Before checking idle speed, check throttle link mechanism and
throttle valve for smooth operation.
1. Start engine and allow to warm up.
2. Attach engine tachometer to the ignition high-tension cord.
09900-26006 : Engine tachometer
3. Check engine speed.
Idle speed (in neutral gear):
DF90/115: 600 – 650 r/min
DF140: 650 – 750 r/min
ADJUSTMENT:
If the idle speed is out of specification, adjust it as follows:
4. Shift into neutral and close the throttle fully.
5. To set the IAC valve duty to constant 30 %, turn the ignition
key from ON to START five times within ten seconds.
At this time, the caution buzzer will sound to notify that IAC
duty is in fixed mode.
NOTE:
• The ignition key operation should be performed with the
engine running at idle.
• While IAC valve duty is at a fixed 30 % duty, the caution
buzzer will sound in a repeating pattern of 0.5 second on with
an interval of 3 seconds off.
• The fixed mode will continue for 5 minutes.
Inspect initially after 20 hours (1 month) and every
200 hours (12 months).
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