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D. CARBURETOR ADJUSTMENTS
This is a complicated task. Read all warnings and instructions thoroughly before _xting adjust-
ments. If you do not tBi_ that you completely understand atI warnings and instructlons, let your
SEARS Service Center/Department perform these adjustments,
A wAp: a . [
Make carburetor adjustments with the umt sup- [
ported to prevent the blade from contacting any]
object, ........ [
A WAR Cn O !
Keep others away when making carburetor ad-
_justments.
i
Serious injury to the operator and others can oc-
cur if the carburetor is no t properly adjusted.
• Poor engine performance can be a result of
other causes such as dirty air filter, carbon
build-up on muffler outlets, clogged fuel fiI-
te_ etc.. See the "Trouble Shooting Chart _
before proceeding with carburetor adjust-
l_leltts.
• The carburetor has been careSd]y adjusted
at the factory. However, the operator must be
sure that adjustments are made when any of
the conditions occur as mentioned in the
"Trouble Shooting Suggestions _ sectiom
• Verysmall adjustments eanaffeet engineper-
formance. It isimportaut to,rathe screwavery
small amount per adjustment and test performance
before making further adjustments. Each adjust_
ment should be no more than the width of the slot in
the adjusting screw.
• This is a complicated task and it is important
to follow instructions in sequence as in_tl.
cared.
1, TROUBI_ SHOOTING SUGGESTION'S
- Engine w_ not continue to run at idle positiom
See _Idle Speed Adjustment" and "I_w Speed
Adjustment."
- Blade continues to move when the en#ne idles.
See _Idle Speed Adjustment" and "DeceIeration
Check__
- EnL_me dies or hesitates When i_ shouldacceler-
ate_ See _Accele_tion Check. _
- Loss of cutting power which cannot be corrected
by cleaning the air filter. See '_qigh Speed Ad-
justmeut."
- Engine does not rehlrn to idle from filll thro_tle
within 2 seconds. See "Decvleration Chec'_u"
-- Engine w_! not run. See _Trouble Shooting
Chart. _ Then, if the carburetor reqvSres adjust-
ment, begin with _BasicCarburetorSettings.
The blade willbe moving during most of thispro- I
cedure, Wear your protective equipment and ob-]
serve all safe_y instructions,
e. Turnlowspeedscrew endhighspeedscrew(l_g-
ure 10 ) clockwiseuntil they stop. uo no_ turn
screws un_ they are tight a_ damage _ needle
$_a_8 C_zn o_r.
b. Turnthe low speed sc_ewbetween thr_-quar-
ters and one full turn countarctock_se.
e. Turn the high speed screw one to one and one-
quarter full turns counterclodcwise.
3. ADJUSTING PROCEDURE
m PREPARATION
1, U_e a fresh fad mi_ See _Fue]_ngYour En-
gine/'
2. Star_ the engine, Trim hedges for 3 minutes
to warmengine. The engine must be at o.per,
a_g temperat_e before exzrburetor adjuzt-
merits can be performed eorrec_y,
b. IDLE SPEED ADJUSTMENT
1. Allow engine to idle,
2. Adjust idle speed screw (Figure t0 ) un_ the
enginecontinues to run without stallingano
withoutblademoving.
- Turn id/e _peed _ doc_ise to increase
engine speed if the e_gin__a]Js or dies.
- _r_ idle _eed ,crew eounterdoekwise to
slow engine down and/or to keep blade
from turn_ng.
3, Follow instructions in '_kccelera_ion Check"
and "Deceleration Check,"
4. No further adjustments are necessaryif
the blade does not move at idle speed
and ff performance is satisfactory.
Recheck idle speed after each adjustm _e!at. Thel
blade must not move at idle speed to avoid serious ]
injury to the opiate r and others. !
c. ACCELERATION CHECK
L Allow the enginetoidle.
2. Squeeze the throttletriggerfully.
If performance is satisfaetor_ pro-
ceed to _d. Deceleration Check."
b. If the engine does not accelerate
smoothi_ t_rn the low speedscrew (Pig-
ure 10 ) counterclockwise a small amount
(no more than the width oftheslotinthe
adjusting screw).
3. Repeat_p _2.b."un_fl smooth acceleration
is obtained,
I_ may be necessary to repeat "I_e Spe_d
Adjustment" _hrough _Aceelemtion Check,' to ob-
taia correct adjustments.
4, Follow instructions in "Deceleration
Chec!_"
,,,,,, ,,
Low Speed S_ew Idle S_ed
Screw
2. BASIC CARBURETOR SETTINGS
run uroperly with minor adjustments.
Refer to "Trouble Shooting Suggestions" for the
condition you are experiencing and follow the in-
s_xuetions. The basic carburetor settings are pro-
vided in the following_ctions,
Figure 10
- 11-
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