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• mllul ii iiiii ,,,,i i
D. CARBURETOR ADJUSTMENTS
• Poorengineperformancecanbearesultofother
causes such as dirty air filter, carbon build-up on
muffler outlets, etc,See "Trouble Shooting Chart"
,before proceeding with carburetor adjustments,
e The carburetor has been adjusted at the factory
forse_ level conditions. Adjustments may become
n_ il_the unit is used at significantly higher
._altitudesorif y0u no/iceanyof/t_ followingcond_ons:.
NOTE:Be sure to properly prepare the s_w as
described in"1. Preparation" l_low, before making
anyadjustments.
_ Chain moves when the engine runs at idle
speed. See "2. Idle Speed Adiustment:'
-_. Saw:will not idle. See "2. Idle SpeedAdjust-
ment, and "3._Low Speed Mixture Adjust-
menU'
.... Lossofcuffin9powerwhich isnotcorrected by
•aWfiltercleaning.."See "5. HighSpeed Mixture
Adjustment."
-- J=nginedies or f_sltates when itshould accel-
emte;'See "4. Acceleration Adjustment"
CAUTION: j Permanent damagewiil oc_jr to any
2-cycle engine if incorrect carburetor adjust-
ments am made,
• Iftheunitwillnotoperateproperlyaftermaking
• these adjustments, take the unit to your Seam
Service'Center.
_WARNING t
Thechain will bemoving dudngmost ofthisprocedure__l_
Wear your protective gear _nd observe al! safe_
I precaut,ons. 1
1. PREPARATION
'.._..a,_,Stop engine. .
b. Use'a. fresh fuel mixture with proper gasoline/ -
oil r_io.
• c_ _ace_thes_yonasolid, flatsudace and maP,esure
the chain will n_ contact any object.
d. Locate the three (3) carburetor adjusting screw
openingsto the rightofthe air _lter cover.Figure 41.
e: Start theengine and allowengine toidte3 minutes
lo warm up. The engine must be at operating
:temperature forproper ad_jJ_t_J_s to be m_de.
= HHHH H'_ ,N,H U" ............
/ ; / SPE_D SCR_'W
I -
...... i: ........................... "' - -
Figure 4_1
,,,,,,,,,,,
, i,m , ,
2. IDLE SPEED ADJUSTMENT
a. Allow engine to idle•
b. Pd_ustldleSpe_dScrew untilenginecontinues_o
run without _Jing and without the chain moving.
Turn screw clockwise _ to increase
engine _Tpeedif engine stalls or dies.
Turn screw counterclockwise _ tOslow
engine down and/or to keep the chain from
turtiing.
c. No further adjustments are necessary if the
chain does not move at idle speed and if perfor*
mance is satislacto ry.
_WARNING
Recheck id{e speed after each adjust ment below. The
chain must not move at idle speed to avoid serious
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. TurntheLowSpeed MixtureScrewcounterclock-
wise _ untiltheRPMspeedsupand_a,-ts
to drop again, Note lhe position.
d. Set the low Speed Mixture Screw a_the m_d-
I;_,intbetween the two positions.
AOCEL_RATION ADJUSTMENT
Ifengine dies or hesitates instead ofaccelerat:ing, turn
the Low Speed Mixture Screw 1/16of aturn at a _ime
coun_er,c!ockw'_e _ until you have smooth
acceleration.
HIGH SPEED MIXTURE ADJUSTMENT
CAUTIONS. Adjustments as small as 1/16 of a
turn can affect engine performance. It is impor-
tant toturn the screw only 1/16ofa turn per adjust-
mentand test the performance of the saw befo re
m_king further adjustments.
a. Make a_est,cut.
b. Adjustthe High Speed Mixtu_ Scr_w l!16 of a turn
as follows:
--Clockwise _ _ifsaw'smokes or loSespower,
-- Counterclockwise _ if the saw has speed
out of the cut but Jackspower in the _ut.
Repeat te_. cut.
d. Continue 1/16 of a turnadju3tments untit the saw
runs smoothly in cut.
j C_ALtTION: JAtoo lean high speed setting (clock-
wise _ adiustment) will cause engine dam.
age to any 2-cycle engine from overheating and
lack of lubrication :-Never set the high speed mix-
turescrewsofarclockwise _-_ th_youh_e
high engine speed but lack power while cutting,
An effective approach follows:
-- Turn screw counterclockwise _ until
engine loses power while cutting.
_-__Thenr,_Ltum.".S.C.t_=_r.C.lO_kwise.._ ir_1l_; of a .....
turn increments only until the engine has
power while ,cutting.
NOTE: _fthe unit will not operate propedy after
making theseadjustments,take _e un_ toy_urSears
service center,
19
.
.
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