Carburetor Adjustments - Craftsman 358.351080 Operator's Manual

SERVICE AND ADJUSTMENTS
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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 uniL 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 ADJUflTME_"
RECHECK IDLE SPEED AFTER EACH
ADJUSTMENT. THE CHAIN MUST NOT
MOVE AT IDLE SPEED.
If engine does not start, it may be flooded, if in doubt, read
the section on fleoded 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 necessaryif 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
"ldte Speed Adjustment."
• Saw will not idle. See "Idle Speed Adjustment" and "Low
Speed Mixture Adjustment."
• Engine dies or hesitates when it should accelerate. See
"Aoceteration 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 marked with the letter "T."
• 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. 49)
Ifyour engine wilt not start due to suspectedimproper car-
buretoradjustment, the followingpresets may be required.
If used, it is recommended that all steps withinthe adjust-
ment procedure be completed in order to assurea properly
set carburetor.If presets are not needed, proceed to sec-
tion "Idle Speed Adjustment."
When makingadjustments,be careful not toforce the plas-
tic limiter caps beyond the stops or damage willoccur.
Very small adjustmentscan affect engine performance.It is
importantto make slight adjustmentsand test performance
before proceeding. Each adjustment°shouldbe no more
than 1/16 of a turn.
•Tum both of the mixture adjustments clockwise until
they stop,Do not overtightenas damage to the needles
will occur
• Turn both mixture adjustments counterclockwiseone full
turn
• Turn the idle speed adjustment clockwiseuntil it stops
Now turn countemlockwise4-1/2 turns
• If engine fails to start after performingcarburetor presets,
the unit may be ftooded. 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."
Idle Speed Adjustment
Figure 49
Mixture
Adjustment
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" 25 "