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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-T under adjusting procedure.
• Saw wJtt 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 tabeted 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 timiter 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 TROU-
BLESHOOTING CHART or cat_
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.
Acceleration Check
If the engine dies or hesitates instead of
accelerating, turn the low speed mixture
adjustment counterclockwise until you
have smooth acceleration with no chain
movement at idle. Recheck and adjust
as necessary for acceptable perfor-
mance.
15
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