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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
adiusting steps, do not use the unit. For further assistance, please call our customer assistance hottine at
1-800-235-5878.
tf engine does not start, it may be flooded, if in doubt,
read the section on flooded engine in the starting sec..
tion 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:
CARBURETOR PRESETS (Fig. 50)
If your engine will not start due to suspected improper
carburetor adjustment, the following presets may be re-
quired. If used, it is recommended that all steps within
the adjustment procedure be completed in order to
assure a properly set carburetor. If presets are not need-
ed, proceed to section "Idle Speed Adjustment"
, Chain moves when the engine runs at idle speed. See
"1die Speed Adjustment."
, Saw witl not idle. See "idle Speed Adjustment" and
"Low Speed Mixture Adjustment."
, Engine dies or hesitates when it should accelerate..
See "Acceleration Adjustment."
o Loss of cutting power which is not corrected by air fil-
ter cleaning. See "High Speed Mixture Adjustment°"
When making adjustments, be careful not to force the
plastic fmiter caps beyond the stops or damage wilt
Occur,
Very smal adjustments can affect engine performance.
it is important to make slight adjustments and test per-
formance before proceeding. Each adjustment should
be no more than 1/16 of a turn°
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 "U' for
tow speed, and the other "H" for high speed.
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 SPEEDr
o Turn both of the mixture adjustments counterclock-
wise untit they stop.
o Turn the idle speed adjustment clockwise until it
stops Now turn counterclockwise 4-t/2 turns.
o If engine fails to start after performing carburetor pre-
sets, 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."
i
Idle Speed Adjustment _'_"-'_,_.
p r, Mixture t-I1
i/!llll_MJ J /,..3",PE:= "_ HighSpeed
[_"_ t% o_'2__ _ Mixture
=="_" Adjustment
Figure 50
-23_
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