Instruction manual

thelowspeedmixtureadjustmentre-
checkidlespeedaftereachturnofthe
screw.Thechainmustnotmoveatidle
speed.
Carburetoradjustmentiscriticalandif
doneimproperlycanpermanently
damagetheengineaswellasthecar-
buretor.Ifyourequirefurtherassis-
tanceorareunsureaboutperforming
thisprocedure,callourcustomeras-
sistancehelplineat1-800-235-5878.
Oldfuel,adirtyairfilter,dirtyfuelfilter,
orfloodingmaygivetheimpressionof
animproperlyadjustedcarburetor.
Checktheseconditionsbeforeadjust-
ingthecarburetor.
Thecarburetorhasbeencarefullyset
atthefactory.Adjustmentsmaybe
necessaryifyounoticeanyofthefol-
lowingconditions:
• Chainmovesatidle.SeeIDLE
SPEED-Tunderadjustingprocedure.
• Sawwillnotidle.SeeIDLESPEED-T
andLOWSPEEDMIXTURE-Lunder
adjustingprocedure.
• Enginediesorhesitateswhenit
shouldaccelerate.SeeACCELERA-
TIONCHECKunderadjusting
procedure.
• Lossofcuttingpower.SeeHIGH
SPEEDMIXTURE-Hunderadjusting
procedure.
Therearethreeadjustmentscrewson
thecarburetor.TheyarelabeledH,L,
andT.Theyarelocatedintheareajust
abovetheprimerbulb.
ADJUSTING PROCEDURE
CAUTION: Do not force plastic limiter
caps on screws beyond the built-in
stops or damage will occur.
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. Then turn it
counterclockwise 4 and 1/2 turns.
3= Start engine and let it run for 3 min-
utes, then proceed to adjust
screws according to the instruc-
tions below. If engine performance
at initial settings is acceptable, no
further adjustments are necessary.
If engine does not start, refer to the
TROUBLESHOOTING TABLE. If still
unable to remedy situation, call
1-800-235-5878.
Idle Speed-T
Allow engine to idle. If the chain
moves, idle is too fast. If the engine
stalls, idle is too slow. Adjust speed
until engine runs without chain move-
ment (idle too fast) or stalling (idle too
slow).
• Turn idle screw (T) clockwise to in-
crease engine speed.
• Turn idle screw (T) counterclockwise
to decrease engine speed.
Low Speed Mixture-L
Allow engine to idle. Then accelerate
the engine and note performance. If
engine hesitates, bogs down, or
smokes during acceleration, turn low
speed mixture screw (L) clockwise in
1/16-turn increments until performance
is satisfactory. Repeat this procedure
as necessary for proper adjustment.
After completing adjustments, check
for acceleration and chain movement
at idle. Reset if necessary.
High Speed Mixture-H
DO NOT operate engine at full throttle
for prolonged periods while making ad-
justments. Damage to the engine can
occur. Make a test cut. Based on per-
formance of the saw while cutting, ad-
just the high speed mixture setting in
1/16-turn increments as follows:
• Turn the high speed mixture screw (14)
clockwise until saw has good power in
the cut with no hesitation. Do not ad-
just by sound or speed, but judge by
how well the saw performs in the cut.
• Turn the high speed mixture screw (H)
counterclockwise if the saw has
speed, but dies in the cut or lacks
power in the cut.
After completing adjustments, check
for acceleration and chain movement
at idle. Reset if necessary.
Acceleration Check
If the engine dies or hesitates instead of
accelerating, turn the low speed mixture
screw (L) counterclockwise until you
have smooth acceleration with no chain
movement at idle.
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