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D.
CJLRBURETOR
ADJUSTMENTS
•
Poorengineperformancecanbe_zmsultotother
causes such as dirty air 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. Yourdealer has the training,
experience and toolsnecessary to properly adjust
yoursaw to meet ourfactoryperformancespecifica-
tions. This service is not covered by.warrant, if it
becomes necessary for you to make carburetor
adjustments yourself,followthe procedures below
veryc_refully.
• Tho carburetor h asbeen adjusted atthefactory forsea
levelcondit_ons. Adjustments maybecome necessary
if thesaw isused at significantly higheraltitudesor if
you noticeany 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 it should 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.
if the unit w'dlnot operate prol_edy after making
these adjustroents,take the saw ton 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. Placethesaw on a sclid, flat surfaceand roake sure
the chainwili not contact any object.
d. Loca_ the three (3) c_'buretor adjusting screw
openingstothedghtofthe air fittercover. Figure44.
e. Startthe engine and allowengine to idle 3 minutes
to warm up. The engine must be at operating
temperature for proper 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 Screw until e nginecontinues to
runwithoutstallingand withoutthechain.moving.
--Turn
screw clockwise _
to increase
engine spe_l ff enginestatlsor dies.
-- Turnscrew counterc/ockwise _
to slow
engine down and!or to keep the chain from
turning.
c. No further adjustments are necessary if the
chain does not move at idlespeed and if perfor-
mance iS satisfactory.
I
,t_ WARNING
Recheck idle speed aftereach adjustment below. The
I chain must not move at idle speed to avoid sedous
injury.
3. LOW SPEED MIXTURE ADJUSTMENT
a. Allow engine to idle.
b Turn the Low Speed Mixture Screw slowly
clockwise _
until the RPM starts to drop.
Note the position.
c. Turnthe Low Speed Mixture Screwcounterclock-
wise _
untilthe RPM speedsup and stads
to drop again. Note the posltion_
d. Set the Low Speed Mixture Screw at the mid-
point between the two positions.
4. ACCELERATION
ADJUSTMENT
Ifeeginedies or hesitatesinstead of acceleraling, turo
the Low Speed Mixture Screw 1/16ofa turnat a tim_
counterclockwise _
until you have smooth
acceleration.
5. HIGH SPEED MIXTURE ADJUSTMENT
|CAUTION: ! Adjustments
as small as 1/16 of a
"turn can affect engine performance. It is impor-
tant to turn the screw only 1/16of a turn per adjust-
ment and test the performanceof the saw before
making further adjustments.
a. Make a test cut.
b. hz_ustth_High Sp_edMixtumS_ew
!1!6of a_tu[n
aSfollows:
Clockwise _
ifsaw smokesor losespower.
-- Counterclockwise _
ifthe saw hasspeed
out of the cut but lackspower 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
ahci lack of ta"b_ca't'_n. N_tsetthehlgh
sp_i
roixtum screw so far clockwise _
that you
have high speed but tack power while 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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