Engine; Adjusting The Engine Idling Speed - Yamaha CS50 Service Manual

ADJUSTING THE ENGINE IDLING SPEED

k a
k a
k b
k b

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)
Engine tachometer
90890-03113
3. Check:
• engine idling speed
Out of specification
Engine idling speed
1.650 ~ 1.950 r/min
4. Adjust:
• engine idling speed
a. Remove the center panel.
b. Turn the pilot air screw
lightly seated.
c. Turn the pilot screw out the specified num-
ber of turns.
Pilot air screw setting
CS50: Dellorto 2 - 2
Gurtner 1
CS50Z: Dellorto 1
d. Turn the throttle stop screw
k a or k b until the specified engine idling
speed is obtained.
Direction k a
Direction k b
e. Install the center panel.
5. Adjust:
• throttle cable free play
Refer to "ADJUSTING THE THROTTLE
CABLE FREE PLAY"
Throttle cable free play (at the
flange of the throttle grip)
3-8
2 ~ 5 mm
CHK
ADJ
Adjust.
in or out until it is
1
/
4
3
/ - 2
4
3 1
/ ± /
4 8
in direction
Engine idling speed is
increased.
Engine idling speed is
decreased.