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SERVICE AND ADJUSTMENTS
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TO ADJUST CARBURETOR
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The carburetor (See Fig, 39 and Fig, 41 on page 25) has
been pre-set at the factory and readjustment should not
be necessary, However, if the carburetor does needto be
adjusted, proceed as follows:
e
Close the high speed adjusting screw by hand
•
Do not over-tighten,
e
Then open it 1-1/4 to 1-1/2 turns•
®
Close the idle adjusting screw by turning clockwise
by hand, Do not over-tighten,
e
Then open it 1-1/4 to 1-1/2 turns
•
Start the engine and let it warm up
e
Set the throttle control to RUN
Adjust the high
speed adjusting screw in until the engine speed or
sound alters, Adjust the screw out until the engine
speed sound alters Note the difference
between
the two limits and set the screw in the middle of the
range
e
Set the throttle control to SLOW
Adjust the idle
adjusting screw in until the engine speed drops,
then adjust the screw out until the engine speed
drops_ Note the difference between the two limits
and set the screw in the middle of the range
®
if the engine tends to stall under load or not accel-
erate from low speed to high speed properly, adjust
the high speed screw out in 1/8 turn increments until
the problem is resolved
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Let the engine run undisturbed
for 30 seconds
between each setting to allow the engine to react to
the previous adjustments,,
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
NEARESTSEARS
SERVICE CENTER,
WHICH HAS THE PROPER
EQUIPMENT
AND EXPERIENCE TO
MAKE ANY NECESSARY
ADJUSTMENTS
TO ADJUST OR REPLACE
THE SPARK PLUG
If you have difficulty starting your snow thrower, you may
need to adjust or replace the spark plug
Follow the
instructions below.,
Replace the spark plug if electrodes are pitted or burned
or if the porcelain is cracked,.
IDLE ADJ USTING SCREW
(Close finger
tight only)
HIGH SPEED ADJUSTING
SCREW
(Close finger tight only)
i
L,
ill
,i,
•
FIG. 39
TO ADJUST:
Q
Clean the spark plug by carefully scraping elec-
trodes (do not sand blast or use a wire brush),
Be sure the spark plug is clean and free of foreign
material Check electrodes gap (See Fig 40) witt_a
wire feeler gauge and reset the gap to .030 inch it
necessary
FIG, 40
TO REPLACE:
•
if you need a new spark plug, use onfy the proper
replacement spark piug (See page 4),
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Set the gap to ,030
o
Before installing the spark plug, coat its threads
lightly with oil or grease to insure easy removal
•
Tighten the plug firmly into the engine,
•
If a torque wrench is available, torque the plug to 18
to 23 ft - Ibs,
24
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