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1
4.
DEmEan
&TION
CHECK
a. Allow engine to idle, then squeeze Throttle Trigger
fully.
b. Allow engine to run at full speed for about I second.
c. Release the Throttle Trigger to the idle position and
listen to the deceleration
of the engine. It must return
to idle smoothly and within 1 to 2 seconds.
1.)Ifperfonnam:e issatisfactory, proceed to step "d:'
2. )If the engine slowly or erratically
returns to idle
or idles erratically,
repeat "2. Idle Speed Adjust-
ment" or continue through Low Speed Mixture and
High Speed Mixture Adjustments
to obtain proper
deceleration.
d. Recheck idle speed.
& ••.towsPnnMJx ,jn
ADJUS
a. Allow engine to idle.
b. Tumthe Low Speed Mixture Screw 0Figme 25) slow-
: ly clockwise
_
until the speed starts to drop. Note
this position.
c. Turn the Low Speed Mixture Screwcounterclockwise
until the speed increases and then stm'tsto drop
again. Note this position.
6.
HIGH SPEED MIXTURE
ICAUTZON: 1 Do not operate engine at full throttle for
prolonged
periods
while
making
high
speed
adjustments
as damage to the engine can occur.
a. Support the drive shaft housing offthe ground so the
trimmer line will not contact any object.
b. Allow engine to idle, then squeeze Throttle Trigger
fully.
NOTE. Perform steps c. through
e. at fuU throttle.
c. Turn High Speed Mixture Screw _igure
25) very
slowly clockwise
_
until engine speed is reduced.
d. Turn
High
Speed
Mixture
Screw
very
slowly
counterclockwise
_.
Stop when the engine just
begins to run rough.
e. Turn the screw slowly the minimum amotmt clockwise
until the engine runs smoothly.
f. Follow instructions in "3. Acceleration Check" and 4.
Deceleration
Check"
ICAUTION:I
If the engine
does
not operate
according
to these instructions
after repeating the
adjusting steps, do not use the tool. Take it to your
Sears Service Center.
d.
e.
Set the Low Speed Mixture Screwat the mid-point bet-
ween the two positions.
Follow instructions in "3. Acceleration Check" and '_€.
Deceleration
Check?'
ADJU ]ksrJtErCr
SCREW _
_JF/dn/"Yl
i
A /1
!
L
' IDLE SPEED
[
_AH_GH SPEED
MIXTUR
E
;juSTMENT
/
7. nASmCAnSUnETORS rmGS
•a. Turn the Low Speed Mixture Screw and the HighSpeed
Mixture Screw (Figure 25) clockwise
_
just until
they stop. Do not turn the screws until they are O'ghtas
damage to the needle seats can occur.
b. Turn the Low Speed Mixtureand High Speed Mixture
Screws one full turn counterclockwise ,i,-_.
c. Follow instruetions"l.
Preparation," through "6. High
Speed Mixture Adjustment,'
8.
REINSTALL
AIR FILTER
Be sure filter is clean. See "_dr Filter" for instructions.
ICAUTION:[ Fit air filter into the comers of the
housing tokeep dirt from entering the engine and caus-
ing enginedamage.
ii
iii
HIIIIIIHI IIHII
III
D. &iR
FILTER
A dirty air filterdecreases the life and performance ofthe
engine and increases fuel consumption.
Clean the Air Filter:
• Always after $ tanks of fuel or 5 hours of operation,
•
whichever
is less.
• More frequently,
in dusty conditions.
1. Pull the Air Filter from the engine with you fingers.
For Air Filter location, see "Specifications:'
.
3.
I I
1111111111111111111111111
Wash in soap and water.
ICAUTION: I Do
not clean
the
air
filter
in
gasoline
or
other
flammable
solvent
to avoid
creating
a fire hazard,
Squeeze dry and replace.
[¢_,UTION:I
The air filter must be fitted into
the corners of the
housing
to avoid
engine
damage.
17
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