ECB00480

CAUTION:

The carburetor has been set and extensively tested at the Yamaha factory. Changing these settings without sufficient technical knowledge may result in poor performance of or damage to the engine.

EBU24000

Adjusting the engine idling speed

The engine idling speed must be checked and, if necessary, adjusted as follows at the intervals specified in the periodic maintenance and lubrication chart.

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NOTE:

A diagnostic tachometer is needed to make this adjustment.

1. Start the engine and warm it up.

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 increase the engine idling speed, turn the throttle stop screw in direction (a), and to decrease it, turn the screw in direction (b).

1

(a)(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.

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