TO ADJUST CARBURETOR (See Fig. 32)

The carburetor has been preset at the factory and adjust- merit should not be necessary. However, minor adjust- ment may be required to compensate for differences infuel, temperature, altitude or Ioado If the carburetor does need adjustment, proceed as follows:

tn general, turning idle mixture valve in (clockwise) de- creases the supply of fuel to the engine giving a leaner fuel/ air mixture. Turning the idle mixture valve out (counter- clockwise) increases the supply of fuel to the engine giving a richer fuel/air mixture.

IMPORTANT: DAMAGE TO THE NEEDLE VALVE AND THE SEAT IN CARBURETOR MAY RESULT IF SCREW IS

TURNED IN TOO TIGHT,

PRELIMINARY SETTING -

oAir cleaner assembly must be assembled to the carbu- retor when making carburetor adjustments.

°Be sure the throttle control cable is adjusted properly (see above).

°With engine off turn idle mixture valve in (clockwise) closing it finger tight and then turn out (counterclock- wise) ! full turn.

FINAL SETTING

°Start engine and allow to warm for five minutes. Make final adjustments with engine running and shift/motion control lever in neutral (N) position.

=Move throttle control lever to slow position_ With finger, rotate and hold throttle lever against idle speed screw° Turn idle speed screw to attain 1750 RPM.

oWhile still holding throttle lever against idle speed screw, turn idle mixture valve in (clockwise) unttl en- gine begins to die and then turnout (counterclockwise) until engine runs rough° Turn valve to a point midway between those two positions. Release throttle lever.

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iiiii

USTMENTS

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ACCELERATION TEST -

°Move throttle control lever from slow to fast position. If engine hesitates or dies, turn idle mixture valve out

(counterclockwise) 1/8 turn° Repeat test and continue

to adjust, if necessary, until engine accelerates smoothly_

High speed stop is factory adjusted. Do not adjust - damage may result.

IMPORTANT: NEVER TAMPER WITH THE ENGINE GOVERNOR, WHICH IS FACTORY SET FOR PROPER ENGINE SPEED. OVERSPEEDING THE ENGINE ABOVE

THE FACTORY HIGH SPEED SETTING CAN BE DANGEROUS. IF YOU THINK THE ENGINE-GOVERNED

HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR

NEAREST AUTHORIZED SERVICE CENTER/

DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND

EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS°

THROTTLE

IDLE SPEED

LEVER

SCREW'

IDLE MIXTURE

VALVE

FIG. 32

25

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Sears 917.258524 owner manual Final Setting, Acceleration Test

917.258524 specifications

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