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ECB00480
CAUTION:
1
The carburetor has been set and extensively
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tested at the Yamaha factory. Changing these
settings without sufficient technical knowl-
3
edge may result in poor performance of or
damage to the engine.
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EBU24000
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Adjusting the engine idling speed
The engine idling speed must be checked and, if
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necessary, adjusted as follows at the intervals
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specified in the periodic maintenance and lubrica-
tion chart.
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NOTE:
A diagnostic tachometer is needed to make this
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adjustment.
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1. Start the engine and warm it up.
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NOTE:
The engine is warm when it quickly responds to the
throttle.
2. Attach the tachometer to the spark plug lead.
3. Check the engine idling speed and, if neces-
sary, adjust it to specification by turning the
throttle stop screw at the carburetor. To in-
crease the engine idling speed, turn the throt-
tle stop screw in direction (a), and to decrease
it, turn the screw in direction (b).
1. Throttle stop screw
Engine idling speed:
1650–1750 r/min
NOTE:
If the specified idling speed cannot be obtained as
described above, have a Yamaha dealer make the
adjustment.
8-24
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(b)
(a)
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Troubleshooting
