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Oldfuel,adirtyairfilter,adirtyfuelfil-
ter,orfloodingmaygivetheimpres-
sionofanimproperlyadjustedcarbu-
retor.Checktheseconditionsbefore
adjustingthecarburetor.
Thecarburetorhasbeencarefullyset
atthefactory.Adjustmentsmaybe
necessaryifyounoticeanyofthefol-
lowingconditions:
•Thetrimmerheadand/oranyoption-
alattachmentmovesatidle.See
IDLESPEED-Tunderadjustingpro-
cedure.
• Enginewillnotidle.SeeIDLE
SPEED-Tunderadjustingprocedure.
•Enginediesorhesitatesinsteadof
accelerating.SeeACCELERATION
CHECKunderadjustingprocedure.
•Lossofcuttingpower.SeeMIXTURE
ADJUSTMENT(LorH)underadjust-
ingprocedure.
Therearethreeadjustmentscrewson
thecarburetor.Thelowspeedadjust-
mentscrewismarkedwiththeletterL,
andthehighspeedadjustmentscrewis
markedwiththeletterH.Thethirdscrew
istheidleadjustmentscrewandis
markedwiththeletterT.
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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