Stihl 561 C-M, Instruction Manual, Page: 17 / 28

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0000-GXX-8720-A0
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► Take out the screw (1).
► Pull out the shutter (2).
► Hold the shutter (2) so the snowflake points to
the mark (3).
► Fit the shutter.
► Fit the screw (1).
11.2 Summer Operation
The shutter must be set to summer mode when
working at temperatures above +10°C.
► Shut off the engine.
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0000-GXX-8721-A0
► Take out the screw (1).
► Pull out the shutter (2).
► Hold the shutter (2) so the sun points to the
mark (3).
► Fit the shutter.
► Fit the screw (1).
11.3 Calibrating the trimmer
The trimmer adjusts itself automatically for opti‐
mum performance during operation. Calibration
enables the trimmer to be adjusted faster for
optimum performance.
► Remove mowing head or metal cutting attach‐
ment.
This allows the trimmer to reliably adjust to the
optimum performance.
► If the outside temperature is below -10°C or
the engine is cold:
► Start the engine.
► Warm up the engine by opening and closing
the throttle for about 1 minute.
► Shut off the engine.
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min
A B C
s > 30 s 30-60 s
0000-GXX-3825-A0
► Move the choke lever to position .
► Start the engine without depressing the throttle
trigger.
The engine runs and the choke lever remains
in position .
► Run the engine for at least 30 seconds but no
more than 60 seconds (A) without depressing
the throttle trigger.
NOTICE
■ The calibration process is aborted if the throt‐
tle trigger is released before the trigger is
properly calibrated. It is then necessary to
restart the calibration process.
► Keep the throttle trigger fully depressed.
NOTICE
■ The trimmer can be incorrectly calibrated if the
throttle trigger is not kept fully depressed dur‐
ing calibration. This can damage the brushcut‐
ter.
► Keep the throttle trigger fully depressed.
► Depress the throttle trigger for at least 30
seconds (B) and hold it in that position.
The engine accelerates and the trimmer is
calibrated. The engine speed fluctuates and
increases perceptibly during calibration.
► If the engine stalls: Make another attempt to
calibrate the trimmer.
► If the engine stops repeatedly: Do not use
your trimmer and contact your STIHL servicing
dealer for assistance.
The brushcutter is defective.
► As soon as the engine speed drops noticeably
(C): Release the throttle trigger.
The engine runs at idling speed. The brushcut‐
ter is calibrated and ready for use.
11 Operating the Trimmer English
0458-856-0121-A. VA0.B21. 17