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III iiii .......... ii ................. . I ........ ii j , iiiiiiiiiiii/ill il i i _
D. _IkRBUREI'OR AI_IU_rMENTS
• Poorengine performance can bea resultofother
causes such as dirty air filter, carbon build-up on
muffler outlets, etc,See "Trouble ShootingChart"
before proceeding with carburetor adjustments.
• Thecarburetorhasbeen adjuated at the factory
form levelconditions. Adjustments maybecome
necessary ifthe unit isused at significanth/higher
al_,ddesorifyouno_eanyofthefolk_ _:
NOTE: Be sure to propedy prepare the saw as
describedin"1. Preparation" below,beforemaking
anyadjustments.
--Chain moves when the engine runs at idle
speed. See "2. Idle Speed Adjustment:"
-- Saw will not idle. See "'2. idle Speed Adjust-
ment" and "'3. Low Speed Mixture Adjust-
ment/'
-- Lossofcutting powerwhich isnotcorrectedby
airfilter cleaning. "'See"5. HighSpeed Mixture
Adjustment/'
Engine dies orhesitates when itshouldaccel-
erate. See "4. Acceleration Adjustment"
l CAUTION: t Permanentdamage willoccurtoany
2-c:-ycleengine if incorrect carburetor adjust-
ments are made,
• Ifthe unit will not operate properly aftermaking
these adjustments, takethe unit to your Sears
Service Center.
! _,WARNING
Thechain willbemovingduringmostof thisprocedure,
Wear :your protective gear and observe all safety
precautions.
1. PREPARATION
a. Stopengine.
b. Use a {resh fuel mixture with propergasoline/
oilratio.
c. Placethes_on asolid,_surface and makesure
thechainwillnotcontactany object.
d. Locatethethree(3)carburetoradjusting screwsto
the rightofthe airfiltercover.Figure41.
e. Starttheengineandallowenginetoidle 3minutes
to warm up. The engine must be at operating
temperatureforproper adjustmentstobemade.
Figure 41
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q
2. IDLE SPEED ADJUSTMENT
a. Allowengineto idle.
b. AdjustIdleSpeed Screwuntilenginecontinues to
runwithoutstallingand withoutthechainmoving
-- Turnscrewclockwisetoincreaseenginespeed
ifenginestaf/sordies
-- Turnscrewcounterc/ockwiseto slow engine
downand/ortokeepthechainfromturning.
c. No further adjustments are necessary if the
chaindoesnot moveatidlespeedand ifperfor.
mance issatisfactory.
. AWARNING
Recheck/die speed after each adjustment below. The
chain must not move at idle speed to avoid serious
injury.
3. LOW SPEED MIXTURE ADJUSTMENT
a. Allow engineto idle.
b. Turnthe LowSpeed Mixture Screwslowlyclock-
wise untiltheRPM startstodrop.Notetheposition.
c. "rumtheLowSpeed MixtureScrewcounterclock-
wise untilthe RPM speeds up andstartstodrop
again. Notetheposition.
d. Set the Low Speed Mixture Screw at the m=d-
pointbetween the twopositions.
.
5_
ACCELERATION ADJUSTMENT
tfenginediesorhesitatesinsteadofaccelerating,turn
the Low Speed Mixture Screw 1/16ofa turnat a
time counterclockwise until you have smooth
acceleration.
HIGH SPEED MIXTURE ADJUSTMENT
CAUTI_..] Adjustments as small as 1/16 of a
turn can affect engine performance. It isimpor-
tant to turnthescrewonly 1/16ofaturnperad|ust-
ment and testthe performance ofthe saw before
making further adjustments.
a. Make a testcut.
b. Adiust theHighSpeed MixtureScrew1/16ofa turn
as follows:
----C!ockwJseff sawsmokesorlosespower.
-- Counterclockwiseifthesaw hasspeed outof
thecutbutlackspowerinthecut.
c. Repeat testcut.
d. Continue1116ofa turnadjustmentsuntilthe saw
runssmoothlyincut.
Atoo lean highspeed setting (clock°
wise adjustment) will cause engine damage to
any 2,cycle engine from overheating and lackof
lubrication. Never set the high speed mixture
screw sofarclockwise th*atyou havehigh engine
speed but lackpower while cutting. An effective
approach follows:
-- Turn screw counterclockwise until engine
loses power while cutting,
-- Then, turn screw clockwise in 1/16of a turn
increments only until the engine has power
while cutting.
NOTE: if the unit will not operate properly after
makingtheseadjustments, taketheunittoyourSears
Service CenterlDepartment.
19¸
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