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CARBURETOR
ADJUSTMENT
_IL WARNING:
The trimmer head or
blade will be spinning during most of this
procedure. Wear protective equipment
and observe all safety precautions. After
making mixture adjustments,
recheck
idle speed.
Carburetor adjustment is critical and if
done improperly can permanently
damage the engine as well as the car-
buretor. If you require further assis-
tance or are unsure about performing
this procedure, call our customer as-
sistance help line at 1-800-235-5878.
Old fuel, a dirty air filter, a dirty fuel fil-
ter, or flooding may give the impres-
sion of an improperly adjusted carbu-
retor. Check these conditions before
adjusting the carburetor.
The carburetor has been carefully set
at the factory. Adjustments
may be
necessary if you notice any of the fol-
lowing conditions:
• Engine will not idle. See IDLE SPEED
under adjusting procedure.
• Engine dies or hesitates instead of
accelerating. See ACCELERATION
CHECK under adjusting procedure.
• Loss of cutting power. See MIXTURE
ADJUSTMENT under adjusting
procedure.
There are three adjustment screws on
the carburetor. The low speed adjust-
ment screw is marked with the letter L,
and the high speed adjustment screw
is marked with the letter H. The third
screw is the idle adjustment screw.
Adjustment "H"
Adjustment
"L"
Idle Screw Adjustment
ADJUSTING
PROCEDURE
Idle
Speed Adjustment
Allow
engine to idle. Adjust speed until
engine runs without stalling.
• Allow engine to idle. Be sure trimmer
line is extended
to the maximum
length allowed by the line limiter.
• Adjust
idle speed screw
until engine
continues
to run without stalling.
• Turn the screw clockwise
to in-
crease
engine
speed
if the engine
stalls
or dies.
• Turn screw
counterclockwise
to
slow engine
down.
• Follow
instructions
in ACCELERATION
CHECK.
• No further adjustments
are necessary
if performance
is satisfactory
and trim-
mer head does not turn at idle speed.
Low Speed Adjustment
"L"
When
making
carburetor
adjustments,
do not force plastic
limiter
caps beyond
stops or damage
will occur.
• Allow the engine
to idle.
• Turn screw
"L" slowly
clockwise
until
the speed
begins
to drop. Note the
position
of the screw.
Do not attempt
to adjust beyond
the stops as dam-
age can occur.
• Slowly turn the screw
counterclock-
wise until the speed
increases
and
then begins
to drop.
• Adjust
the screw
to the midpoint
be-
tween the two positions.
• Check the acceleration
by following
the steps
outlined
under ACCELERA-
TION CHECK. The trimmer
head must
not turn at idle speed.
High Speed Adjustment
"H"
CAUTION:
Do not operate
engine
at
full speed
for prolonged
periods
while
making
mixture
adjustments
as dam-
age to the engine
can occur.
When
making
carburetor
adjustments,
do not force plastic
limiter
caps beyond
stops or damage
will occur.
• Support
lower end of the unit so that
it is off the ground
and will not make
contact
with any objects.
Be sure the
trimmer
line is extended
to maximum
length
allowed
by the line limiter.
• Start the engine
and allow to idle.
• Squeeze
the throttle
trigger
fully.
• Keep unit running
at full speed;
turn
screw "H" very slowly
clockwise
until
the speed
begins
to slow down.
• Do not let go of the throttle
trigger,
and turn screw
counterclockwise
un-
til the engine
begins
to run roughly.
• Still holding
the throttle
trigger,
turn
the screw slowly
a small amount
until
the engine
begins
to run smoothly.
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