Sears 917.258542 Service Adjustments, To Adjust Throttle Control Cable, Acceleration Test

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SERVICE ADJUSTMENTS

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ENGINE

TO ADJUST THROTTLE CONTROL CABLE

(See Fig. 32)

The throttle control has been preset at the factory and adjustment should not be necessary. Check adjustment as described below before loosening cable If adjustment is necessary, proceed as follows:

•With engine not running, move throttle control lever from slow (,_) to choke (N) position+ Slowly move lever from choke (1\{) to fast (,_) position.

•Check to see if hole in throttle lever and hole in speed control bracket are aligned°

•If holes are not aligned, loosen cable clamp screw and align the holes by inserting a pencil or a 1/4" drill bit through both holes.

•Pull throttle cable up to remove slack and tighten cable clamp screw. Remove alignment pencil or drill bit.

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ACCELERATION TEST-

. Move throttle control lever from stow (._) to fast ('#t_)

position. If engine hesitates or dies, turn idie fuel

adjusting needle out (counterclockwise) 1/8 turn, Re- peat test and continue to adjust, if necessary, until engine accelerates smoothly,

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

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. tF 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,

CABLE

CLAMP

SCREW,

TO ADJUST CARBURETOR (See Fig, 33)

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

In general, turning the adjusting needles in (clockwise) decreases the supply of fuel to the engine giving a leaner fueVair mixture. Turning the adjusting needles out (counter-

clockwise) increases the supply of fuel to the engine giving a richer fuellair mixture°

IMPORTANT: DAMAGE TO THE NEEDLES AND THE SEATS tN CARBURETOR MAY RESULT IF NEEDLE 1S TURNED IN TOO TIGHT

NOTE: The carburetor on this engine is low emission.. It is equipped with an idle fuel adjusting needle with a limiter cap, which allows some adjustment within the limits allowed by the cap, Do not attempt to remove the limiter cap+ The [imitercap cannot be removed without breaking the adjusting needle.

•Be sure you have a clean air filter and the throttle control cable is adjusted properly (see above).

oStart engine and allow to warm for five minutes. Make

adjustments with engine running and shift/motion control lever in neutral (N) position.

. Id!e s#eed settinq - With throttie control lever in slow (.a_)position, engine should idle at 1750 RPM. If engine idles too slow or fast, turn idle speed adjusting screw in or out until correct idle is attained.

•I.d!_+..f_elneedle settinq - With throttle control lever in slow (,_,) position, turn idle fuel adjustment needle in (clockwise) until engine begins to die and then turn out (counterclockwise) until engine runs rough+Turn needle to a point midway between those two positions,.

o Recheck idle speed. Readjust if necessary+

SPEED

BRACKET

THROTTLE

LEVER

FIG. 32

IDLE SPEED

ADJUSTING

SCREW ,,._'----._ •

IDLE FUEL,

ADJUSTING

NEEDLE

FIG. 33

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