Carburetor Adjustment - Craftsman BRUSHWACKER 358.795020 Operator's Manual

CARBURETOR
ADJUSTMENT
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.
L Screw
Idle Adjustment
CARBURETOR PRESETS
When making carburetor preset adjust-
ments, do not force plastic limiter caps
beyond stops or damage will occur.
If carburetor presets are not needed,
proceed to "Adjusting Procedure, Idle
Speed."
To adjust presets:
• Turn both mixture screws counter-
clockwise to the midpoint between
the limiter cap stops.
• Turn the idle speed screw clockwise
until it stops. Now turn counterclock-
wise 4-1/2 turns.
• Start motor, cut grass for 3 minutes,
and proceed to the adjustment sec-
tion. If engine does not start,
refer to troubleshooting chart or call
1-800-235-5878.
• If engine performance is acceptable
at the preset positions, no further ad-
justment is necessary.
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.
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