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SERVICE AND ADJUSTMENTS
CARBURETOR PRESETS (Fig. 49)
CARBURETOR ADJUSTMENTS
Carburetor adjustment Is critical and if done improp-
erly can permanently damage the engine as well as
the carburetor. Please read all instructions and con-
sult the Troubleshooting section of this manual
before beginning this process.
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.
ITengine does not start, it may be flooded. If in doubt,
read the section on flooded engine in the starting section
of this manual prior to beginning any adjustments.
If you are unsure about adjusting the carburetor or expe-
rience any problem while attempting this process, please
call the 1-800 number listed on the front cover of this
manual for further assistance.
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 will not idle. See "Idle Speed Adjustment" and =Low
Speed Mixture Adjustment."
• Engine dies or hesitates when it should accelerate. See
"Acceleration Adjustment."
• Loss of cutting power which is not corrected by air filter
cleaning. See "High Speed Mixture Adjustment."
NOTE: Your chain saw carburetor isequipped with limiter
caps. Do not attempt to adjustthe mixturescrews beyond
the stops as damage can occur.
If your engine will not start due to suspected improper
carburetor adjustment, the following presets may be
required.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
needed, proceed to section"Idle Speed Adjustment."
Very small adjustments can affect engine performance. It
is important to turn the screw a very small amount per
adjustment and test performance before making further
adjustments. Each adjustment should be no more than
the widthof the slot in the adjusting screw.
• Turn both of the mixture screws counterclockwise until
they stop.Do not attempt to adjust the screw beyond
the stops as damage can occur.
• Turn idle speed screw clockwise 1/2 turn.
• 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 t-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
Low Speed
Mixture
Adj
Figure 49
High Speed
Mixture
Adjustment
-25-
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