Carburetor Adjustment - Craftsman WEEDWACKER 358.795120 Operator's Manual

CARBURETOR ADJUSTMENT
,_ILWARNING: The trimmer head
will be spinning during most of this
procedure. Wear your protective
equipment and observe all safety pre-
cautions. After making mixture adjust-
ments, 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 two adjustment screws on
the carburetor, a mixture screw and an
idle speed screw.
Screw
Mixture Screw
(with Limiter Air Filter
Cap)
ADJUSTING PROCEDURE
CAUTION: Do not force plastic ]imiter
caps on screws beyond the built-in
stops or damage will occur. Be sure
trimmer line is extended to the maxi-
mum length allowed by the line limiter
blade.
Initial Settings:
1. Turn mixture screw counterclock-
wise until it stops.
2. Turn the idle speed screw clockwise
until it stops. Now turn counterclock-
wise 4 1/2 turns.
3. Start engine, cut grass for 3 min-
utes, then proceed to adjust screws
according to the instructions below.
If engine performance at initial set-
tings is acceptable, no further ad-
justments are necessary. If engine
does not start, refer to TROUBLE-
SHOOTING TABLE. If still unable to
remedy situation, call
1-800-235-5878.
Idle Speed
Allow engine to idle. Adjust speed until
engine runs without stalling.
• Turn idle speed screw clockwise to
increase engine speed if engine stalls
or dies.
• Turn idle speed screw counterclock-
wise to decrease engine speed.
No further adjustments are necessary
if performance is satisfactory.
Mixture Adjustment
CAUTION: Do not operate engine at
full throttle for prolonged periods while
making adjustments as damage to the
engine can occur. Adjust the mixture
screw 1/16 of a turn at a time. A 1/16
turn is about the width of the slot in the
top of the screw.
• Turn the mixture screw clockwise
until the engine has good power
with no hesitation while cutting.
Do not adjust by sound or speed,
but judge by how well the engine
performs while cutting.
• Turn the mixture screw counter-
clockwise if the engine has speed
but dies or lacks power while cutting.
After completing adjustments, check
for acceleration. Reset if necessary.
Acceleration Check
If engine dies or hesitates instead of
accelerating, turn the mixture screw
counterclockwise until you have
smooth acceleration.
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