Idle Speed - Suzuki DF200 Service Manual

2-16 PERIODIC MAINTENANCE

IDLE SPEED

Inspect initially after 20 hours (1 month) and every
200 hours (12 months).
NOTE:
• Before checking idle speed, engine must be warmed 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. Remove bolt and No. 1 ignition coil.
2. Connect special tool (H·T cord with plug cap adapter)
between No. 1 ignition coil and spark plug.
! 09930-89350: H·T cord with plug cap adapter
3. Start engine and allow to warm up.
4. Attach engine tachometer to the special tool.
! 09900-26006: Engine tachometer
5. Check engine speed.
Idle speed (in neutral gear): 600 – 700 r/min.
ADJUSTMENT:
If engine idle speed is out of specification, the following adjust-
ment procedure must be performed.
6. Shift into Neutral and close the throttle fully (this will cause
the fully close throttle signal to be input to the ECM).
7. 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, caution buzzer will sound to notify that IAC duty
is in fixed mode.
NOTE:
• The ignition key operation to set the IAC valve into the fixed
mode 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 inter-
val of 3 seconds off.
• The 30% fixed mode of IAC valve duty will continue for 5 min-
utes after which it will automatically cancel.
8. During this fixed mode of IAC valve duty, adjust engine
speed to 650 ± 50 r/min. by turning by-pass air screw.
Turning air screw counterclockwise:
Turning air screw clockwise:
Engine speed will increase.
Engine speed will decrease.
2
1. PORT throttle body
2. By-pass air screw
No. 1 Ign. coil
1