Sears 917.25597 owner manual $Ervrce And Adjustments, TO ADJUST CARBURETOR See Figs. 41 and

$ERVRCE AND ADJUSTMENTS

i ,,,=

TO ADJUST CARBURETOR

(See Figs. 41 and 42)

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 in fuel, temperature, altitude or Ioado If the carburetor does need adjustment, proceed as follows:

In general, turning the mixture screw in (clockwise) de- creases the supply of fuel to the engine giving a leaner fuel/ air mixture. Turning the mixture screw out (counterclock-

wise) increases the supply of fuel to the engine giving a richer fuel/air mixture,.

IMPORTANT: DAMAGE TO THE NEEDLES AND THE SEATS IN CARBURETOR MAY RESULT IF SCREW IS TURNED rN TOO TIGHT.

PRELIMINARY SETTING -

oBe sure you have a clean air filter, and the throttle control cable and choke are adjusted properly (see above).

°With engine off turn idle mixture screw in (clockwise) closing it finger tight and then turn out (counterclock- wise) 1-1/4 to 1-1/2 turns.

FINAL SETTING -

°Start engine and allowto warm for five minutes. Make final adjustments with engine running and shift/motion control lever in "NEUTRAL" position.

oWith throttle control lever in "SLOW" position, hold throttle lever against idle speed screw and adjust idle speed screw to obtain 1200 to 1400 RPMo

oWhile still holding throttle lever against idle speed screw, turn idle mixture screw in (clockwise) until engine begins to die and then turn out (counterclock- wise) until engine runs rough. Turn screw to a point midway between those two positions.

oContinue to hold throttle lever against idle speed screw and adjust idle speed screwto obtain 900 to 1200 RPM Release throttle lever.

,ACCELERATION TES]: -

•Move throttle control lever from "SLOW" to "FAST"

position, if engine hesitates or dies, turn idle mixture screw out (counterclockwise) 1/8 turn. Repeat test and continue to adjust, if necessary, until engine accel- erates smoothly..

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

IMPORTANT: NEVER TAMPER WITH THE ENGINE

GOVERNOR, WHICH IS FACTORY SET FOR PROPER

ENGINE SPEED. OVERSPEEDINGTHE ENGINE ABOVE

THE FACTORY HIGH SPEED SETTING CAN BE DANGEROUS,, IF YOU THINKTHE ENGINE-GOVERNED

HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR

NEARESTAUTHORtZED SERVICE CENTER, WHICH HAS PROPER EQUIPMENT AND EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS..

IDLE SPEED

SCREW

IDLE MIXTURE

SCREW

THROTTLE

LEVER

FIG. 41

IDLE MIXTURE

LEVERSCREW

FIG. 42

2S