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The carburetor hasbeen carefully set
atthefactory. Adjustments
may be
necessary ifyounotice a nyofthefol-
lowing c onditions:
• Chain moves a tidle.See IDLE
SPEED-T under adjusting procedure.
• Saw willnotidle. S eeIDLE SPEED-T
and LOW SPEED MIXTURE-L
under
adjusting procedure.
• Engine d iesorhesitates when it
should a ccelerate. See ACCELERA-
TION CHECK under a djusting
procedure.
• Loss ofcutting power. SeeHIGH
SPEED MIXTURE-H
under a djusting
procedure.
There arethree adjustment
screws o n
thecarburetor. They arelabeled H ,L,
andT.
ADJUSTING
PROCEDURE
CAUTION: Donot f orce plastic l imiter
caps onscrews b eyond t hebuilt-in
stops ordamage willoccur.
Initial S ettings
1. Turn both mixture s crews ( LandH)
counterclockwise
until t hey stop.
2. Turn theidlespeed s crew (T)
clockwise until i tstops. Then turnit
counterclockwise
4-1/2 turns.
3. Start e ngine a ndletitrunfor3 min-
utes, t hen proceed toadust
screws accord n gtothefo owng
instructions. Ifengine p erformance
atinitial s ettings isacceptable, no
further a djustments
arenecessary.
Ifengine d oes not s tart, r efer t othe
TROUBLESHOOTING
TABLE. Ifstill
unable t oremedy 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 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.
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