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SERVICE AND ADJUSTMENTS
CARBURETOR ADJUSTMENTS
Carburetor adjustment Is critical and If done Improperly can permanently damage the engine as well as the
carburetor. Please read all Instructions and consult the Troubleshooting section of this manual before
beginning this process. If the engine does not operate according to these Instructions after repeating the
adjusting steps, do not use the unit. For further 8ssistsnca, please call our customer aselstsnca hotllne at
1-800-235-5878.
If engine does not start, it may be flooded.If in doubt,
read the section on flooded engine in the starting sec-
tionof this manualpriorto beginninganyadjustments.
The carburetor hasbeen adjusted at thefactory for sea
level conditions.Adjustmentsmay become necessary if
the saw is used at significantlyhigheraltitudesor ifyou
notice any ofthe following conditions:
• Chain moveswhen the engine runsat idlespeed.See
"Idle Speed Adjustment."
• Saw will not idle. See =Idle Speed Adjustment"and
=Low SpeedMixture Adjustment;
• Engine dies or hesitates when it shouldaccelerate.
See "Acceleration Adjustment."
• Loss of cuttingpowerwhich is notcorrectedby air til-
ter cleaning. See "High Speed MixtureAdjustment."
NOTE: There are three adjustmentson thecarburetor.
• The Idle Speed Adjustmentismarked withthe letter
• The two remaining adjustments on the carburetor
are the mixtureadjustments. One is marked =L"for
low speed, and the other "H"for highspeed.
A
WARNING:
THE CHAIN WILL BE MOVING DURING
MOST OF THIS PROCEDURE. WEAR
YOUR PROTECTIVE EQUIPMENT AND
OBSERVE ALL SAFETY PRECAUTIONS.
IN "LOW SPEED MIXTURE ADJUST-
MENT;' RECHECK IDLE SPEED AFTER
EACH ADJUSTMENT.THE CHAIN MUST
NOT MOVE AT IDLE SPEED,
CARBURETOR PRESETS (Fig. 50)
If your engine will not start due to suspected improper
carburetoradjustment,the following presets may be re-
quirad. If used, it is recommended that all stepswithin
the adjustment procedure be completed in order to
assure a properlyset carburetor. Ifpresets are notneed-
ed, proceed tosection"Idle Speed Adjustment."
When making adjustments,be careful not to force the
plastic limiter caps beyond the stops or damage will
OCCUr.
Very small adjustmentscan affect engine performance.
It is importantto make slightadjustments and test per-
formance before proceeding. Each adjustment should
be no more than 1/16 of a rum.
• Turn bothof the mixture adjustments countemlock-
wise untiltheystop.
• Turn the idle speed adjustment clockwise until it
stops.Now turncountemlockwise 4-1/2 turns.
• If engine fails to start after performing carburetor pre-
sets, the unit may be flooded. Review the "Difficult
Starting"section of the manual. If problemscontinue
call the 1-800 number listedon the front cover of this
manual forfurther assistance.
• Start the engine and operate for three (3) minutesto
warm up.Go to "AdjustingProcedure."
Figure50
"23-
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