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Old fuel, adirty airfilter, adirty f uel f il-
ter, o rflooding may give theimpres-
sion ofanimproperly
adjusted carbu-
retor. Check these c onditions
before
adjusting the carburetor.
The carburetor
has been c arefully set
atthe factory. Adjustments
may be
necessary
ifyou notice any ofthe fol-
lowing conditions:
• The trimmer head a nd/or any option-
alattachment
moves atidle. S ee
IDLE S PEED-T
under adjusting pro-
cedure.
• Engine will n ot i dle. See IDLE
SPEED-T
under adjusting procedure.
• Engine dies orhesitates instead of
accelerating.
See ACCELERATION
CHECK
under adjusting procedure.
• Loss o fcutting power. See MIXTURE
ADJUSTMENT
(LorH)under adjust-
ingprocedure.
There a re three adjustment
screws on
thecarburetor.
The lowspeed a djust-
ment screw ismarked with the letter L,
and the high s peed a djustment
screw is
marked with the letter H. T he third screw
is theidleadjustment
screw andis
marked with the letter T.
Adjustment
(__stment
(L)
Idle Screw Adjustment (T)
ADJUSTING
PROCEDURE
CAUTION:
Do not force plastic limiter
cap 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 both mixture screws (L and
H) counterclockwise
until they
stop.
2. Turn the IDLE SPEED screw (T)
clockwise
until it stops. Now turn
counterclockwise
4 1/2 turns.
3.
Start engine, cut grass for 3 min-
utes, then proceed to adjust
screws according
to the instruc-
tions below.
If engine perfor-
mance at initial settings is accept-
able, no further adjustments
are
necessary.
If engine does not
start, refer to TROUBLESHOOTING
TABLE.
If still unable to remedy
situation, call 1-800-235-5878.
Idle Speed-T
Allow engine to idle. If the trimmer
head moves, idle speed is too fast.
If
the engine stalls, idle speed is too
slow.
• Turn IDLE SPEED screw (T) clock-
wise to increase engine speed.
• Turn IDLE SPEED screw (T) counter-
clockwise
to decrease
engine
speed.
Low Speed Adjustment
-L
1. Allow the engine to idle.
2.
Turn low speed mixture screw (L)
slowly clockwise
until the speed
begins to drop.
3. Turn the low speed mixture screw
(L) counterclockwise
until the
speed increases
and then starts to
drop again.
4.
Set the low speed mixture screw
(L) at the midpoint
between the
two positions.
Readjust the idle speed (See IDLE
SPEED-T).
High Speed
Mixture-H
CAUTION:
Do not operate engine at
full throttle for prolonged
periods while
making high speed adjustments
as
damage
to the engine can occur.
Ad-
just the high speed 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.
1. Allow the engine to idle.
2.
Squeeze
the throttle trigger fully.
Turn the high speed mixture screw
(H) counterclockwise
until it stops.
3.
Turn the high speed mixture screw
(H) 1/16 of a turn clockwise
at a
time until the engine runs smooth-
ly.
After completing
adjustments,
check
for acceleration
and trimmer head
movement
at idle. Reset if necessary.
Acceleration
Check
If engine dies or hesitates
instead of
accelerating,
turn the low speed mix-
ture screw (L) counterclockwise
until
you have smooth acceleration.
16
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