Stihl MS 291 C-Q Manual De Instrucciones página 45

1
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:
MS 291 C-Q
– 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,
A
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.
Installing the spark plug
1
N Insert the spark plug through the
grommet and screw it in by hand.
N Tighten down the spark plug, fit the
boot and press it down firmly.
N Install the shroud – see "Shroud".
2
English
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