Yamaha 25BMH Service Manual page 138

CHK
CONTROL SYSTEM
ADJ
(3) Make sure that the idle speed is stable
when the throttle is opened and closed
for several times.
NOTE:
If the idle speed is not stable, disassemble
and readjust the carburetor.
3. Adjust:
• Engine idle speed
Adjustment steps
(1) Turn the idling stop screw
retor in direction
ified engine idle speed is obtained.
Direction Engine idling speed i i i i n n n n c c c c r r r r ea
a
Direction Engine idling speed d d d d e e e e c c c c r r r r ea
b
(2) Check the engine idling stability by
opening and closing the throttle for
several times. If engine idling is unsta-
ble, adjust the pilot screw.
NOTE:
After adjustment, open and close the throt-
tle for several times and keep it idling for at
least 15 seconds. Check if engine idle speed
is stable.
3-17
E
2
of carbu-
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or until the spec-
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