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€. CARBURETOR
ADJUSTMENTS
AWARNING
Make carburetor adjustments with the drive shaft hous-
ingsupportedtopreventthetrimmer
line from contact-
ing any object. Hold the tool with your hand. Do not use
the optional
shoulder
strap for support.
AW_G
Keep
others
away
when
making
carburetor
adjustments.
Aw asm
Serious injury to the operator and others can occur if the
carburetor
is not properly adjusted.
• The carburetor has been carefully adjusted at the
• factory. However, the operator must be sure that
adjustments
are made when any of the following
conditions
occur:
NOTE:
Be sure to properly
prepare the• toolas
deseribedin
"1. Preparation" before making any adjust-
• ments.
-- Engine will not continue to run at idle position.
See "2. idle
Speed Adjustment"
and "5. Lmv
Speed Mixture Adjustment."
-- Trimmer Head continpes to spin when the engine
idles. See "2. Idle Speed Adjustment"
and "4.
Deceleration
Check"
-- Engine dies or hesitates when it should accelerate.
See "3. Acceleration
Check"
-- Loss of cutting power which cannot be corrected by
cleaning the air filter. See "tt I_gh Speed Mixture
Adjustment"
-- Engine does not return to idle from full throttle
• within 2 s_onds.
See'_4. Deceleration
Check"
--Engine
will not run. See "Troubling
Shooting
Chart"
Then, if the carburetor
requires adjust-
ment, begin with "7. Basic Carburetor
Settings"
• This is a complicated
task and it is important
to
follow instructions
in sequence as indicated.
• Very Small adjustments
can affect engine perfor-
mance. It is important to turn the screw a very small
amount per adjustment and test performance
before
making further adjustments. Each adjustment should
be no more than the width of the slot in the adjusting
screw.
_k WAdtt_G
The trimmer line will be spinning during most of this
procedm_
Wear your protective equipment ando_e
all safety instructions.
1. PREPARA'I_ON
a. Use a fresh fuel mix. See "Fueling Your Engine"
b. Make sure the line extends to the length allowed by
the line limiter to provide correct load on engine.
C-
d.
Start the engine. Cut grass for 3 minutes to warm
en(me. 7he engine must be at operan'ng temperature
before carburetor adjustments
can be performed
correcll_
Stopengine and remove air filterby pulling itoutwith
your fingers. Refer to "Specifications" for location.
2. IDLE SPEED
ADJUSTMENT
a,
b.
Allow engine to idle.
Adjust Idle SpeedScrew (Figure 25) until the engine
continues to run without stalling and without the
trimmer head moving.
-- Turn screw clockwise
_
to increase engine
speed if the engine stalls or dies.
-- Turn screw
counterclockwise
&-_
to slow
engine down andiorto keep the trbnmer linefrom
turning.
c. Follow instructions in "3. Acceleration Check" and
'_,. Deceleration
Check."
d. No further adjustments are necessary ifthetrim-
mer head does not turn at idle speed and if per-
formance is satisfactory.
_WARNING
Recheck idle speed after each adjustment. The trimmer
head must not turn at idle speed to avoid serious injury
to the operator and others.
3.ACCELERATION
CHECK
a. Allow engine to idle.
b. Squeeze Trigger fuliy.
1.) Ifperformance
is satisfactory, proceed to '4.
Deceleration Check"
2.) If the engine does not accelerate smoothly, turn
the Low Speed Mixture
Screw
(Figure
25)
counterclockwise
_,_
a small
amount
(no
more than the width of the slot in the adjusting
screw).
c. P-_eat step "'b." until smooth acceleration is
obtained.
NOTE: It may be necessary to repeat "2. Idle Speed
Adjustment"
through "3. Acceleration
Check" to
• obtain correct adjustments.
d. Follow instructions
in "4. Deceleration Check"
f
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