Adjusting The Engine Idling Speed - Yamaha F40BMHD Wartungshandbuch

CHK
CONTROL SYSTEM
ADJ
a
b
ADJUSTING THE ENGINE IDLING
SPEED
NOTE:
The engine should be warmed up for the
adjustment.
Correct adjustment cannot be obtained
when the engine is cold.
1. Measure:
•
Measuring steps
(1) Start the engine and allow it to warm
up for a few minutes.
(2) Install the tachometer onto the spark
plug lead of cylinder #1.
2. Adjust:
•
Adjustment steps
(1) Turn the throttle stop screw
1
tion
idling speed is obtained.
Direction
Direction
(2) Check the engine idling stability. If
engine idling is unstable, adjust the
pilot screw and synchronize the carbu-
retors.
NOTE:
Rev the engine two or three times and keep
it idling for at least 15 seconds after adjust-
ment to check the engine's stability.
3-5
Engine idling speed
Out of specification → Adjust.
Engine idling speed
850±50 r/min
Tachometer
YU-08036-A/90890-06760
Engine idling speed
a b
or until the specified engine
Engine idling speed
a
increases.
Engine idling speed
b
decreases.
E
1
in direc-