FS 40, FS 40 C, FS 50, FS 50 C
English
29
Installing the Spark Plug
N Screw the spark plug into the
cylinder.
N Press the spark plug boot with cap
firmly on to the spark plug.
If the cap has become detached from
the spark plug boot:
N Push the cap on to the spark plug
boot as far as stop.
If engine running behavior is
unsatisfactory even though the air filter
is clean and the carburetor is properly
adjusted, the cause may be the muffler.
Have the muffler checked for
contamination (carbonization) by your
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer.
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.
Engine Running Behavior
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