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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 andconsult 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, itmay be flooded, if indoubt, read
the sectionon 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 necessaryifthe
saw isused at significantly higher altitudes or ifyou 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 withthe 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)
Ifyourengine wiltnotstart due to suspectedimpropercar-
buretoradjustment, thefollowingpresetsmay be required.
If used, itis recommendedthatall stepswithinthe adjust-
mentprocedurebecompleted inordertoassurea properly
set carburetor.If presets are not needed, proceed to sec-
tion "Idle Speed Adjustment."
When makingadjustments,be carefulnot toforcethe plas-
ticlimiter caps beyondthe stops or damage willoccur.
Verysmall adjustmentscanaffect engineperformance.It is
importantto make slightadjustmentsandtestperformance
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 tothe needles
willoccur
• Turnbothmixture adjustments counterclockwiseone full
turn
• Turnthe idle speed adjustment clockwiseuntil itstops
Now turncountemlockwise4-1/2 turns
• Ifenginefails tostart after performingcarburetor presets,
the unit may be ftooded. Review the "Difficult Starting"
section of the manual. If problems continue, call the
1-800 number listedon the front coverof 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 "