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CHAIN
A DJUSTMENT
See CHAIN TENSION in MAINTENANCE
section.
CHANGE
FUEL FILTER
To change fuel filter, drain your unit by
running dry of fuel, remove fuel cap/re-
tainer assembly
from tank.
Pull the fil-
ter from the tank and replace with a
new filter.
CARBURETOR
ADJUSTMENT
_
WARNING:
The chain will be
moving
during most of this procedure.
Wear your protective
equipment
and
observe all safety precautions.
During
the low speed mixture adjustment
re-
check idle speed after each turn of the
screw. The chain must not move at idle
speed.
Carburetor
adjustment
is critical and if
done improperly can permanently
damage
the engine as well as the car-
buretor. If you require further assis-
tance or are unsure about performing
this procedure,
call our customer as-
sistance
help line at 1-800-285-5878.
Old fuel, a dirty air filter, dirty fuel filter,
or flooding
may give the impression
of
an improperly
adjusted
carburetor.
Check these conditions
before adjust-
ing the carburetor.
The carburetor
has been carefully set
at the factory. Adjustments
may be
necessary
if you notice any of the fol-
lowing conditions:
• Chain moves at idle. See IDLE
SPEED under adjusting
procedure.
• Saw will not idle. See IDLE SPEED-T
and LOW SPEED MIXTURE-L under
adjusting
procedure.
• Engine dies or hesitates when it
should accelerate.
See ACCELERA-
TION CHECK under adjusting
procedure.
• Loss of cutting power. See HIGH
SPEED MIXTURE - H under adjusting
procedure.
There are three adjustment
screws on
the carburetor.
They are labeled
H, L,
and T. They are located in the area just
above the primer bulb.
CARBURETOR
PRESETS
When making adjustments,
do not
force the plastic ]imiter caps beyond
the stops or damage
will occur.
If carburetor
presets are not needed,
proceed
to IDLE SPEED-T.
• Turn both mixture screws counter-
clockwise
until they stop.
• Turn the idle speed screw clockwise
until it stops. Now turn counterclock-
wise 4-1/2 full turns.
Start motor, let it run for 3 minutes, and
proceed to the adjustment
section.
If
engine does not start, refer to the
TROUBLESHOOTING CHART or call
1-800-235-5878.
If engine performance
is acceptable
at
the preset positions
and there is no
chain movement
at idle, no further ad-
justment
is necessary.
ADJUSTING
PROCEDURE
Idle Speed-T
Allow engine to idle. Adjust speed until
engine runs without chain movement
or stalling.
• Turn clockwise to increase
engine
speed if engine stalls or dies.
• Turn counterclockwise
to decrease
speed.
No further adjustments
are necessary
if chain does not move at idle speed
and if performance
is satisfactory.
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 mix-
ture screw clockwise
in 1/16-turn incre-
ments 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:
• Clockwise
until saw has good power
in the cut with no hesitation. Do not
adjust by sound or speed, but judge
by how well the saw performs in the
cut.
• 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.
15
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