Craftsman 536.885020 - Manual (Page 25)

TO ADJUST CARBURETOR
The carburetor {See Fig 40 and Fig 42) has been pre-set
at the factory and readjustment should not be necessary
However, it the carburetor does need to be adjusted,
proceed as follows:
SERVICE AND ADJUSTMENTS
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9
Close the high speed adjusting screw by hand
Do not overtighten
Then open it 1-1/4 to 1-1/2 turns
Close the idle adjusting screw by hand. Do not
overtighten
Then open it M/4to 1-1/2 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 alters 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
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
NEAREST SEARS 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.
Clean the spark plug by carefully scraping elec­
trodes (do not sand blast or use a wire brush).
Be sure the spark plug is dean and free of foreign
materia! Check electrodes gap (See Fig. 41) with a
wire feeler gauge and reset the gap to 030 inch if
necessary.
TO REPLACE:
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
Tighten the plug firmly into the engine
If a torque wrench is available, torque the plug to 18
to 23 ft - Ibs .
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