Craftsman 358.351080 - Manual (Page 25)

SERVICE AND ADJUSTMENTS
CARBURETOR ADJUSTMENTS
Carburetor adjustment is critical and if done improper* *
ly can permanently damage the engine as welf as the
carburetor. Please read all instructions and consult the
Trouble Shooting section of this manual before begin*
nfng 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. VTCAR YOUR
PROTECTIVE EQUIPMENT AND OBSERVE
ALL SAFETY PRECAUTIONS.
IN “LOW SPEED MIXTURE ADJUSTMENT,”
RECHECK
IDLE SPEED AFTER EACH
ADJUSTMENT. THE CHAIN MUST NOT
MOVE AT IDLE SPEED.
If engine does not start, if may be flooded. If in doubt, read
the section on flooded engine in the 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 if the
saw is used at significantly higher altitudes or if you notice
any of the following conditions:
• Chain moves when the engine runs at idle speed. See
“Idle Speed Adjustment.”
• Saw wiil not idle. See “Idle Speed Adjustment" and “Low
Speed Mixture Adjustment."
• Engine dies or hesitates when it should accelerate. See
“Acceieration Adjustment."
• 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 is mariced with the letter “T.”
• The two remaining adjustments on the carburetor are the
mixture adjustments. One is marked T” for low speed,
and the other “H” for high speed.
CARBURETOR PRESETS (Fig, 49)
If your engine will not start due to suspected improper car­
buretor adjustment, the following presete may be required.
Jf used, it is recommended that all steps within the adjust­
ment procedure be completed in order to assure a properly
set carburetor. If presets are not needed, proceed to sec­
tion "Idle Speed Adjustment."
When making adjustments, be careful not to force the plas­
tic iimifer caps beyond the stops or damage will occur.
Very small adjustments can affect engine performance. It is
important to make slight adjustments and test perfomranc^
before proceeding. Each adjustment'should be no mote
than 1/16 of a turn,
• Turn both of the mixture adjustments clockwise until
they stop. Do not overtighten as damage to the needles
will occur,
• Turn both mixture adjustments counterclockwise one full
turn.
• Turn the idle speed adjustment clockwise until it stops.
Now turn counterclockwise 4-1/2 turns.
• It engine fails to start after performing carburetor presets,
the unit may be flooded. Review the "Difficult Starting"
section of the manual. If 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 up. Go to “Adjusting Procedure."
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