CONTROL SYSTEM
CHK
ADJ
3-16
E
ADJUSTING THE ENGINE IDLE SPEED
NOTE:
• The engine should be warmed up for
the adjustment. Correct adjustment
cannot be obtained when the engine is
cold.
• Make sure that the pilot screw adjust-
ment is normal before implementing
idling stop screw adjustment.
1. Measure:
•
Engine idle speed
Out of specification
→
Adjust.
CAUTION:
Install the engine in the test tank to check
the engine idle speed.
Measuring steps
(1) Start the engine and allow it to warm
up for a few minutes.
(2) Install the digital tachometer
onto
the spark plug lead of cylinder #1.
(3) Press the position key “C” on the digital
tachometer.
2. Adjust:
•
Carburetor pilot screw
CAUTION:
Do not adjust the carburetor when it is
operating properly. Excessive adjustment
may cause the engine poor performance.
Adjustment steps
(1) Turn in the pilot screw
until they are
lightly seated.
(2) Turn out the pilot screws by specified
number of turns.
Engine idle speed
1,100 ± 50 r/min
Digital Tachometer........................
90890-06760
Pilot screw turn-out
1 - 1/4 ± 3/4
1
1
1
Summary of Contents for 25BMH
Page 48: ...FEATURES AND BENEFITS GEN INFO 1 12 E COOLING SYSTEM Fig 7 ...
Page 49: ...1 12 CARACTERISTIQUES ET AVANTAGES GEN INFO F ...
Page 50: ...1 12 MERKMALE UND VORTEILE GEN INFO D ...
Page 51: ...1 12 CARACTERÍSTICAS Y VENTAJAS GEN INFO ES ...
Page 92: ...MAINTENANCE SPECIFICATIONS SPEC 2 8 E DIMENSIONS ...
Page 156: ...GENERAL CHK ADJ 3 26 E NOTE Grease the inner cable and the lock nut 2 Apply Yamaha grease D ...
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Page 446: ...Printed on recycled paper Printed in Japan Oct 2000 1 9 1 25BMH 30HMH YAMAHA MOTOR CO LTD ...