To adjust carburetor (see fig. 32), Service and adjustments – Sears 917.258524 User Manual

Page 25

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SERVICE AND ADJUSTMENTS

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 maybe required to compensate fordifferences infuel,

temperature, altitude or load. If the carburetor does need
adjustment, proceed as follows:

In 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 fuel/air mixture.

IMPORTANT:

DAMAGE TO THE NEEDLE VALVE AND

THE SEAT IN CARBURETOR MAY RESULT IF SCREW IS

TURNED IN TOO TIGHT.

PRELIMINARY SETTING -

• 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 mixture valve in (clockwise)
closing it finger tight and then turn out (counterclock
wise) 1 full turn.

FINAL SETTING-

Start engine and allow to warm for five minutes. Make
.......................................... ■ I and shift/motion

Move throttle control leverto 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)

■

■ ■ Dolnt midway

I positions. Release throttle lever.

ACCELERATION TEST -

» Move throttle control lever from slow to fast position. If

engine hesitates or dies, turn idle mixture valve out
(counterciockwise) 1/8 turn. Repeat test and continue

to adjust, if necessary, until engine accelerates
smoothly.

Do not adjust -

High speed stop is factory adjusted,

damage may result.

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, IF YOU THINK THE ENGINE-GOVERNED

HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR

NEAREST

AUTHORIZED

SERVICE

CENTER/

DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND

EXPERIENCE

MAKE

ANY

NECESSARY

ADJUSTMENTS.