CHK
ADJ
ADJUSTING THE ENGINE IDLING SPEED
3-8
ENGINE
EAS00054
ADJUSTING THE ENGINE IDLING SPEED
NOTE:
Prior to adjusting the engine idling speed, the
air filter element should be clean, and the engi-
ne shoud have adequate compression.
1. Start the engine and let it warm up for seve-
ral minutes.
2. Connect:
• engine tachometer
(onto the spark plug lead)
3. Check:
• engine idling speed
Out of specification
Adjust.
4. Adjust:
• engine idling speed
a. Remove the center panel.
b. Turn the pilot air screw in or out until it is
lightly seated.
c. Turn the pilot screw out the specified num-
ber of turns.
d. Turn the throttle stop screw in direction
a or b until the specified engine idling
speed is obtained.
e. Install the center panel.
5. Adjust:
• throttle cable free play
Refer to “ADJUSTING THE THROTTLE
CABLE FREE PLAY“
Engine tachometer
90890-03113
Pilot air screw setting
CS50: Dellorto 2 - 2
1
/
4
Gurtner 1
3
/
4
- 2
CS50Z: Dellorto 1
3
/
4
±
1
/
8
Engine idling speed
1.650 ~ 1.950 r/min
Direction a Engine idling speed is
increased.
Direction b Engine idling speed is
decreased.
Throttle cable free play (at the
flange of the throttle grip)
2 ~ 5 mm
a
a
b
b
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