23BR 340, BR 340 L, BR 420, BR 420 C
English / USA
To reduce the risk of fire and burn
injury, use only spark plugs
authorized by STIHL. Always press
spark plug boot (2) snugly onto
spark plug terminal (1) 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
connector in the boot may create
arcing that could ignite combustible
fumes and cause a fire.
If the engine is down on power, check
the spark arresting screen* in the
muffler.
Wait until engine has cooled down
completely before performing the
following operations.
: Use suitable tool to squeeze ends of
clip (1) together and then lift the clip
away.
: Pull the spark arresting screen (2)
out of the muffler.
* see “Guide to Using this Manual”
: Clean the spark arresting screen.
: If the screen is damaged or heavily
carbonized, fit a new one.
: Install the spark arresting
screen (2).
: Refit the clip (1).
00BA036 TR
1
Spark Arresting Screen*
in Muffler
373BA031 KN
1
2
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