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SERVICE AND ADJUSTMENTS
CARBURETOR ADJUSTMENTS
Carburetor adjustment is critical and if done improper-
ly can permanently damage the engine as well as the
carburetor. Please read all instructions and consult the
Trouble Shooting section of this manual before begin-
ning this process° If the engine does not operate
according to these instructions after repeating the
adjusting steps, do not use the unit. For further assis-
tance, please call our customer assistance hotline at
1-800-235=5878_
WARNING:
THE CHAIN WILL BE MOVING DURING
MOST OF THIS PROCEDURE. WEAR YOUR
PROTECTIVE EQUIPMENT AND OBSERVE
ALL SAFETY PRECAUTIONS.
IN"LOW SPEED MIXTURE ADJUSTMENT,"
RECHECK IDLE SPEED AFTER EACH
ADJUSTMEN% THE CHAIN MUST NOT
MOVE ATIDLESPEED.
If engine does not start, it may be flooded° If in doubt, read
the section on flooded engine inthe starting section of this
manual prior to beginning any adjustments.
The carburetor has been adjusted at the factory for sea
level conditions,,Adjustments may become necessary ifthe
saw is used at significantly higher altitudes or ifyou notice
any of the following conditions:
° Chain moves when the engine runs at idle speed. See
"Idle Speed Adjustment."
= Saw will not idle See "Idle Speed Adjustment" and "Low
Speed Mixture AdjustmenV'
- Engine dies or hesitates when it should accelerate° See
"Acceleration AdjustmenU'
• Loss of cutting power which is not corrected by air filter
cleaning. See "High Speed Mixture Adjustment,"
NOTE=There are three adjustments on the carburetor,,
= The Idle Speed Adjustment ismarked with theletter "1"."
• The two remaining adjustments on the carburetor are the
mixture adjustments. One is marked "L_'for low speed,
and the other "H"for high speed°
CARBURETOR PRESETS (Fig. 59)
If your engine will not start due to suspected improper car-
buretor adjustment, the following presets may be required,
If used, it is recommended that all steps within the adjust-
ment procedurebe completed in order to assure a properly
set carburetor,,If presets are not needed, proceed to sec-
tion "ldte Speed AdjustmenU'
Very smatl adjustmentscan affect engine performance. It is
important to make slight adjustments and test performance
before proceeding. Each adjustment should be no more
than 1/16 of a turn,
• Turn both of the mixture adjustments clockwise until
they stop.Do not overtighten as damage to the needle
seats willoccur
• Turn both mixture adjustments counterclockwiseone full
turn_
, Turn the idle speed adjustment clockwise until it stops_
Now turn counterclockwise 4-1/2 turns,
• Ifengine fails to start after performing carburetor presets,
the unit may be flooded° Review the "Difficuft Starting"
section of the manual, tf problems, continue, call the
1-800 number listed on the front cover of this manual for
further assistance.
= Start the engine and operate for three (3) minutes to
warm upoGo to "Adjusting Procedure?
Idle Speed Adjustment
High Speed
Mixture
Adjustment
/
Mixture
Adjustment
Figure 59
27 -
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