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D. CJLRBURETOR ADJUSTMENTS
• Poorengineperformancecanbe_zmsultotother
causes such as dirtyair filter,caH_onbuild-up on
muffler outlets, etc. See "Trouble Shooting
Chart" before proceeding with carburetor
adjustments.
• For best results, Poulan recommends that you
have a qualified service dealer make all car-
buretor adjustments. Yourdealerhasthe training,
experience and toolsnecessaryto properly adjust
yoursaw tomeet ourfactoryperformancespecifica-
tions. This service is not coveredby.warrant, if it
becomes necessary for you to make carburetor
adjustmentsyourself,followthe procedures below
veryc_refully.
• Thocarburetorhasbeenadjustedatthefactoryforsea
levelcondit_ons.Adjustmentsmaybecomenecessary
ifthesaw isusedatsignificantlyhigheraltitudesor if
younoticeany oflhe following conditions:
NOTE: Be sure to propedy prepare the saw as
describedin"1. Preparation" below,before making
any adjustments.
Chain moves when the engine runs at idle
speed. See "2, Idle Speed Adjustment:'
-- Saw will not idle. See "2, Idle Speed Adjust°
roent" and "3. Low Speed Mixture Adjust-
ment."
Enginediesor hesitates when itshould accel-
erate. See "4, Acceleration Adjustment."
-- Loss of cutting power whlch is not corrected
byairfiltercleaning. "See"5. High Speed Mix-
ture Adjustment."
[CAUTION:I Permanent damage willoccurto any
2-cycle engine if incorrect carburetor adjust-
ments are rnade.
ifthe unit w'dlnot operate prol_edyafter making
these adjustroents,take the sawton qualified ser-
vice dealer.
t AWAR"iNG i
The chain will be moving during most of this pro-
cedure. Wear your protective gear and observe all
safety precautions.
i. PREPARATION
a. Stop engine.
b. Use a fresh fuel mixture with proper gasoline/
oil ratio.
c. Placethesawonasclid,flatsurfaceand roakesure
the chainwilinotcontactany object.
d. Loca_ the three (3) c_'buretor adjusting screw
openingstothedghtofthe airfittercover.Figure44.
e. Startthe engine and allowengine toidle 3 minutes
to warm up. The engine must be at operating
temperature forproper adjustments to be made.
CHOKE _ _ HIGH SPEED
CLOSED __ Mix SCREW
IDLE SPEED __,._ _- LOW SPEED
SCREW _'_':%' MIX SCREW
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2, IDLE SPEED ADJUSTMENT
• a. Altowenginetoidle.
b. AdjustIdta Speed Screwuntilenginecontinues to
runwithoutstallingand withoutthechain.moving.
--Turn screw clockwise _ to increase
engine spe_l ff enginestatlsordies.
-- Turnscrewcounterc/ockwise_ toslow
engine down and!orto keep the chain from
turning.
c. No further adjustments are necessary if the
chaindoes notmoveat idlespeedand ifperfor-
mance iS satisfactory.
I ,t_ WARNING
Recheck idlespeed aftereach adjustment below. The
I chain must not move at idle speed to avoid sedous
injury.
3. LOW SPEED MIXTURE ADJUSTMENT
a. Allowengine toidle.
b Turn the Low Speed Mixture Screw slowly
clockwise _ untilthe RPM starts to drop.
Note the position.
c. TurntheLowSpeed Mixture Screwcounterclock-
wise _ untiltheRPM speedsup andstads
todropagain. Notetheposltion_
d. Set the Low Speed Mixture Screw at the mid-
pointbetween thetwo positions.
4. ACCELERATION ADJUSTMENT
Ifeeginediesorhesitatesinsteadofacceleraling,turo
theLow Speed Mixture Screw1/16ofaturnatatim_
counterclockwise _ until you have smooth
acceleration.
5. HIGH SPEED MIXTURE ADJUSTMENT
|CAUTION: ! Adjustments as small as 1/16 of a
"turncan affect engine performance. It is impor-
tantto turnthe screw only1/16ofaturn peradjust-
ment and test the performanceof thesaw before
making further adjustments.
a. Make a test cut.
b. hz_ustth_HighSp_edMixtumS_ew !1!6of a_tu[n
aSfollows:
Clockwise _ ifsawsmokesorlosespower.
-- Counterclockwise_ ifthesaw hasspeed
out ofthe cutbutlackspower in the cut,
c. Repeat test cut.
d. Continue 1/16of a turn adjustments until the saw
runs smoothly in cut.
_-CAUT!ON: JAtoo lean highspeed setting(clock-
wise _ adjustment) wil! cause engine
damage to any 2-cycle engine from overheating
ahcilack of ta"b_ca't'_n. N_tsetthehlgh sp_i
roixtum screw so far clockwise _ that you
have high speed but tackpowerwhile cutting, An
effective approach follows:
.--Turn screw counterclockwise _ unti!
engine loses power while cutting.
• --Then, turn screw clockwise _ in 1/16of a
turn increments only until the engine has
power while cuffing.
NOTE: If the unit will not operate properly.after
making these adjustments, take the saw to a
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