Sears 917.250551 manual Service And Adjustments, TO ADJUST CARBURETOR See Fig

SERVICE AND ADJUSTMENTS

TO ADJUST CARBURETOR (See Fig. 33)

Tile carburetor has been present at the factory and adjust- ment should not be necessary However, minor adjustment may be required to compensate for differences in fuel, 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 (coun- terclockwise) 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 IN TOO TIGHT

PRELIMINARY SETTING -

Be sure you have a clean air filter, and the throttle

control cable is adjusted properly (see "TO ADJUST THROTTLE CONTROL CABLE" in the Service and

Adjustments section of this manual)

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

The high idle is set at the factory and cannot be adjusted.

Idle speed setting - With throttle control lever in slow

(_) position, engine should idle at 1200 RPM If

engine idles too slow or fast, turn idle speed adjusting screw in or out until correct idle is attained.

Idle fuel needle setting - With throttle control lever in

slow (,,_.) position, turn idle fuel adjusting needle in (clockwise) until engine speed decreases and then

turn out (counterclockwise) approximately 3/4 turn to obtain the best low speed performance.

Recheck idle speed. Readjust if necessary

ACCELERATION TEST -

o Move throttle control lever from slow (_) to fast ("_) 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 resulL

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

THE FACTORY HIGH SPEED SETTING CAN BE

DANGEROUS IFYOUTHINKTHEENGINE-GOVERNED

HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR

NEAREST AUTHORIZED SERVICE CENTER/

DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND

EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS

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