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TO ADJUST CARBURETOR
The carburetor (See Fig. 37 and Rg,39) hasbeenpre-set
atthe factoryand readjustmentshouldnot benecessary.
However, if the carburetordoes need to be adjusted,
proceed as follows:
e
Close the high speed adjusting screw by hand.,
®
Do nol overtighten.
e
Then open it t-1/4 to 1-1t2 turns,,
®
Close the idle adjusting screw by hand,,Do not
overtighten,
e
Then open it 1-1/4to tdt2tums,,
®
Start the engine and le!it warmupo
e
Set the throttle controlto RUN,, Adjust the high
speed adjusting screw in until the enginespeed or
SE
CE A
ADJUST
TS
IDLE ADJUSTING SCREW"
(Close finger tight o_tly)
HIGH SPEED ADJUSTING
SCREW
BOWL DRAIN
(Close
finger light only)
FIG. 37
TO ADJUST:
sound aiters_ Adjust the screw out until the engine
speed sound alters. Note the difference between
the two limits and set the screw in the middle ol 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.
e
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 adjustments,
IMPORTANT:
NEVER TAMPER WITH THE ENGINE
GOVERNOR.
WHICH IS FACTORY
SET FOR PROPER ENGINE SPEED.,
OVERSPEEDING
THE ENGINE
ABOVE THE FACTORY HIGH SPEED
o
@
Clean the spark plug by carefully scrapingelec-
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. 41) with a
wire feeler gauge and reset the gap to .030 inch if
necessary°
.
:
,,,i ,11,,, I
i
i
FIG. 38
SETTING CAN BE DANGEROUS.
IF YOU THINK THE ENGINE -
GOVERNED HIGH SPEED NEEDS
ADJUSTING, CONTACT YOUR
NEARESTSEARS SERVICECENTER,
WHICH HAS THE PROPER
EQUIPMENT AND EXPERIENCE TO
MAKE ANY NECESSARY
ADJUSTMENT&
TO ADJUST OR REPLACE
THE SPARK PLUG
Ifyou have difficulty startingyoursnowthrower, you may
need to adjust or replace the spark plug. Follow the
i_structions below,,
Replacethe spark plug if electrodes are pittedor burned
or it the porcelain is cracked.
TO REPLACE:
If you need a new spark plug, use only the proper
replacementspark plug (See page 38),,
•
Set the gap to .030,
®
Before installingthe spark plug, coat its threads
lightly withgraphitegrease to insure easy removal
e
Tightenthe plug firmlyinto the engine.
e
tf a torquewrenchisavailable,torquetheplugtot 8
to 23 ft - lbs.
23
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