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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 will be moving during most of thispro- I
cedure, Wear your protective equipment
and ob-]
serve
all safe_y
instructions,
e. Turnlow speed screw endhighspeed screw (l_g-
ure 10 ) clockwise until 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 stalling ano
without blade moving.
- 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 engine to idle.
2. Squeeze
the throttle trigger fully.
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 oftheslot inthe
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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