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14. Repfacepuflayinthe hdusing.Be_urethe pulleyis
allthe waydown andthe spring issecured.
15. Replace andtighten pulfeyscrew. Figure48,
16. Holdthe t0inchslackinthe mpe and catchrope in
pulley"notch.Figure49.
17. Ho_dtheropetautandmake2completetumsofthe
pulley clockwise _ to place tension on the
pulley.Holdthe pulley toretaintension.
lB. Alignpulleynotchwithropeexithole,puUst_ter han-
dtetothe full extentoftheropeand allowtheropeto
slowlywindaround thepulley.
19. Reinstallthefanhousing.
_J .-" i
Figure49
.............. ,,,,,,,, ,,
E. CARBURETOR ADJUSTMENTS
• Thecarburetorhasbeenadjustedatthefactoryforsea
/evel€ondi_on_Adjustmentsmay become necessary
ifthesaw isused atsignificantlyhigheraltitudes or if
you notice anyofthefollowingconditions.
NOTE: Be sure to properly 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. LowSpeed Mixture Adjustment.
-- Lossofcutting powerwhichisnotcorrectedby
air filtercleaning. "See "5. High Speed Mixture
Adjustment."
Enginedies orhesitateswhen itshould accele-
rate. See "4. Acceleration Adjustment."
tCAUTION: tPermanentdamage willoccurtoany
2-cycle engine if incorrect carburetor adjust-
ments are made.
• Ifthe engine will not operatepropertyaffer mak-
ingthese adjustments, lakethe sawto yourSears
Service Center.
l The chain may be moving during most of this pro-
cedure. Wearyour protectivegearand follow allsafety
instructions,
1. PREPARATION
a. Stopengine,
b. Use a fresh fuel mixturewith proper gasoline/
oilratio,
c, Pl_cethesawonasolid,ftatsurfaceaqd m_',esu_
the chain will notcontact any object.
d. Remove the carburetor cover screws and
•carburetor cover (Figure42) and locate the
three (3)carburetor adjusting screws. Figure 50.
e. Starttheengineandaltowenginetoidle3minutes
to warm UP. The engine must be at operating
temperature for proper adjustments to be made.
CHOKE CLOSED
HiGH SPEED
MIX SCREW
LOWSPEED
IDLESPEED MIX SCREW
SCREW
Figure50
2. IDLE SPEED ADJUSTMENT
a. Allowenginetoidle.
b. AdjustIdle Speed Screwuntilenginecontinues:o
run_thout stailing andwff'noutthechaJnmoving,
Turn screw clockwise _ to increa._-e
engine speed ffengine stallsdr dies.
-- Tui'nscrew counterclockwise_ to sk,w
engine down and/orto keep the chain from,
turning.
•c. No further adjustments are necessary if the
chaindoes not moveat idlespeed andifperfor-
mance is satisfactory.
WARNING
Recheckidlespeed aftereach adjustment below.The
chain must not moveatidle speed toavoidseriousper-
sonal injury.
3, LOW SPEED MIXTURE ADJUSTMENT
a. Allow engine toidle.
b Turn the Low Speed Mixture Screw sf0wty
clockwise _ untilthe RPM starts to drop
Note the pesition.
c. TurntheLowSpeedMixtureSc rewcounterCtock°
wise _ unti!the RPMspeeds up and sta,'ts
todropagain. Note the position.
d. Set the Low Speed Mixture Screw at the rn,d-
point between the two pesitions.
4. ACCELERATION ADJUSTMENT
ffengine dies or hesitates insteadofaccelerating, turn
the Low Speed Mixture Screw It16ofa turnata time
_unterclockwise _ until you have smooth
acceleration.
". 21
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