Servuce and Adjustments, Iengbne | Sears 917.257552 specs

SERVUCE AND ADJUSTMENTS

IENGBNE

TO ADJUST THROTTLE CONTROL CABLE

(See Fig. 31)

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 foIIows:

•With engine not running, move throttte controt lever from slow (-_) to choke (t\) position, Slowly move lever from choke (I\!) 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 t/4" drill bit through both holes.

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

TO ADJUST CARBURETOR (See Fig. 32)

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 infuel, 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 fuel/air mixture_ Turning the adjusting needles out (counter-

clockwise) increases tile supply of fuet to the engine giving a richer fueVair mixture.

IMPORTANT: DAMAGE TO THE NEEDLES AND THE

SEATS IN CARBURETOR MAY RESULT IF NEEDLE IS TURNED IN TOO TIGHT

PRELIMINARY SETTING -

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

oWith engine off turn idle fuel adjusting needle in (clock- wise) closing it finger tight and then turn out (counter- clockwise) 1 turn°

FINAL SETTING -

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

°	Idle spee_		- With throttle	control lever in slow
	(._)	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 attaine&

°idle fue! needle settinq - With throttle control lever in slow (-_) position, turn idle fuel adjusting needle in (clockwise) until engine begins to die and then turn out (counterclockwise) approximately 1/8 to 1/4 turn to obtain best low speed performance.

. Recheck idle speed. Readjust if necessary

ACCELERATION TEST -

° Move:throttlecontrolleverfromslow (_)tofast(_) position, if engine hesitates or dies, turn idle 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 result.

IMPORTANT: NEVERTAMPER 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 THtNKTHE 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

SPEED CONTROL

THROTTLE LEVER

FIG. 31

IDLE SPEED ADJUSTING SCREW

IDLE FUEL ADJUSTING NEEDLE

FIG. 32