To Adjust Carburetor; To Adjust Or Replace The Spark Plug - Craftsman SEARS 536.88502 Owner's Manual

TO ADJUST CARBURETOR
The carburetor (See Fig. 40 and Fig. 42) has been pre-set
atthe factory and readjustment should not be necessary.
However, if the carburetor does need to be adjusted,
proceed as follows:
o Close the high speed adjusting screw by hand
• Do not overtighten.
® Then ope n it 141/4 to t-1/2 turns . ....
e Close the idle adjusting screw by hand. Do not
overtighten
e Then open it 1-1/4 to t-1/2 turns.
• Start the engine and let it warm up.
® Set the throttle control to FAST. Adjust the high
speed adjusting screw in until the engine speed or
sound alters Adjust the screw out until the engine
speed sound altersr Note the difference between
the two limits and set the screw in the middle of the
range.
® 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
e Let the engine run undisturbed for 30 seconds
between each setting to allow the engine to react to
the previous adjustmenls
SERVICE AND ADJUSTMENTS
, ................... i
IMPORTANT: NEVER TAMPER WITH THE ENGINE
GOVERNOR, WHlCH IS FACTORY
SET FOR PROPER ENGINE SPEED
OVERSPEEDtNG THE ENGINE
ABOVE THE FACTORY HIGH SPEED
SETTING CAN BE DANGEROUS.
IF YOU THINK THE ENGINE -
GOVERNED HiGH SPEED NEEDS
ADJUSTING, CONTACT YOUR
NEAREST SEARS SERVICE CENTER,
WHICH HAS THE PROPER
EQUfPMENT 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
25
Replace the spark plug if electrodes are pitted or burned
or if the porcelain is cracked
CARBURETOR
IDLE ADJUSTING SCREW
(Close finger tight only)
TO ADJUST:
o
O
HIGH SPEED ADJUSTING
SCREW
(C!osefingertighlonly)
i
FIGo40
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
matedal. Check electrodes gap (See Fig. 41) with a
wire feeler gauge and reset the gap to 030 inch if
necessary°
,030 GAP
ii i i
FIG. 41
TO REPLACE:
e If you need a new spark plug, use only the proper
replacement spark plug (See page 4 )
® Set the gap to .030
• Before installing the spark plug, coat its threads
lightly with graphite grease to insure easy removal.
o Tighten the plug firmly into the engine
® If a torque wrench is available, torque the plug to 18
to 23 ft - Ibs.