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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.
ADJUSTINGPROCEDURE
CAUTION:Donotforceplasticlimiter
capsonscrewsbeyondthebuilt-in
stopsordamagewilloccur.
InitialSettings
1. Turnbothmixturescrews(LandH)
counterclockwiseuntiltheystop.
2. Turntheidlespeedscrew(T)
clockwiseuntilitstops.Thenturnit
counterclockwise4-1/2turns.
3. Startengineandletitrunfor3min-
utes,thenproceedtoadust
screwsaccordngtothefoowng
instructions.Ifengineperformance
atinitialsettingsisacceptable,no
furtheradjustmentsarenecessary.
Ifenginedoesnotstart,refertothe
TROUBLESHOOTINGTABLE.Ifstill
unabletoremedysituation,call
1-800-235-5878.
IdleSpeed-T
Allow engine to idle. Ifthe chain moves,
idle is too fast. Ifthe engine stalls, idle is
too slow. Adjust speed until engine runs
without chain movement (idle too fast) or
stalling (idle tee 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 (H)
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.
18
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