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MS 261 C-Q
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 Remove the shroud – see "Shroud".
N Move the Master Control lever to the
stop position (0).
N Pull off the spark plug boot.
N Clean away loose dirt from around
the spark plug.
N Insert the combination wrench
through the grommet (1) and turn it
as necessary to engage the spark
plug's hexagon.
N Push the combination fully home
against the cylinder.
N Unscrew the 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 which have caused
fouling of spark plug:
Too much oil in fuel mix.
Dirty air filter.
Unfavorable running conditions,
e.g. operating at part load.
Spark Plug
5902BA013 KN
5902BA014 KN
1
000BA039 KN
A
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
attached.) A loose connection between
spark plug boot and ignition wire con
-
nector in the boot may create arcing that
could ignite combustible fumes and
cause a fire.
1
2
000BA071 KN
44


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