SERVICE AND

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:

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 fue!/air mixture.,

IMPORTANT: DAMAGE TO THE NEEDLE VALVE AND

THE SEAT IN CARBURETOR MAY RESULT tF SCREW IS TURNED IN TOO TIGHT

PRELIMINARY SE-I-FING -

=Air 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 mixt[Jre valve in (clockwise) closing it finger tight and then turn out (counterclock- wise) 1 full turn.,

FINAL SETTING

ADJUST ENT$

ACCELERATION TEST -

•Move throttle control lever from slow (,_) to fast (4) 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 acceler_ ates 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 ENGINI_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.

I

THROTTLE

IDLE SPEED

 

LEVER

SCREW

•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.,

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

IDLE MIXTURE

VALVE

FIG. 32

25

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Image 25
Sears 917.257643 To Adjust Carburetor See Fig, Important Damage to the Needle Valve, Preliminary SE-I-FING, Final Setting
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917.257643 specifications

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