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Stihl MS 661 C-M Installation, Operation & Maintenance Manual

Stihl MS 661 C-M
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MS 661 C-M
English
42
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
Fit a new spark plug after approx. 100
operating hours or earlier if the
electrodes are badly eroded.
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition
of the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
Removing the spark plug
N Turn the cap above the rear handle
in the direction of the arrow and
remove the filter cover
N Unplug spark plug boot (1)
N Unscrew spark plug
Checking the Spark Plug
N Clean dirty spark plug.
N Check electrode gap (A) and
readjust if necessary – see
"Specifications."
N Use only resistor type spark plugs of
the approved range.
Rectify problems that have caused
fouling of spark plug:
too much oil in fuel mix,
dirty air filter,
unfavorable running conditions, e.g.
operating at part load.
WARNING
To reduce the risk of fire and burn injury,
use only spark plugs authorized by
STIHL. Always press spark plug boot (1)
snugly onto spark plug terminal (2) of the
proper size. (Note: If terminal has
detachable SAE adapter nut, it must be
securely attached.) A loose connection
between spark plug boot and ignition
wire connector in the boot may create
arcing that could ignite combustible
fumes and cause a fire.
Spark Plug
1166BA011 AM
1166BA018 AM
1
000BA039 KN
A
1
2
000BA071 KN

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Stihl MS 661 C-M Specifications

General IconGeneral
Idle speed- RPM
Motor type2-stroke motor
Chain pitch3/8 \
Blade length800 mm
Product colorBlack, Grey, Orange
Automatic oilingYes
Engine displacement91.1 cm³
Power sourceGasoline
Sound power level118 dB
Vibration emission6.9 m/s²
Sound pressure level105 dB
Weight and Dimensions IconWeight and Dimensions
Weight7400 g

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