WARNING
Wait for the engine to cool down completely
before performing this work.
► Use suitable tool to squeeze ends of clip (1)
together and then remove the clip.
► Pull the spark arresting screen (2) out of the
muffler.
► Clean the spark arresting screen if necessary.
► Replace the spark arresting screen if it is dam‐
aged or heavily carbonized.
16 Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► Fit a new spark plug after about 100 operating
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
16.1
Removing the Spark Plug
► Move the stop switch to 0.
373BA016 KN
► Pull boot off the spark plug.
► Unscrew the spark plug.
16.2
Checking the Spark Plug
000BA039 KN
A
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
–
Too much oil in fuel mix.
–
Dirty air filter.
–
Unfavorable running conditions.
1
000BA045 KN
WARNING
Arcing may occur if the adapter nut (1) is loose
or missing. Working in an easily combustible or
explosive atmosphere may cause a fire or an
explosion. This can result result in serious inju‐
ries or damage to property.
► Use resistor type spark plugs with a properly
tightened adapter nut.
16.3
Installing the spark plug
► Fit the spark plug by hand and screw it in
► Tighten spark plug with combination wrench
► Press the spark plug boot firmly onto the spark
plug
17 Storing the Machine
► Store the machine in a dry, frost-free and
secure location. Keep out of the reach of chil‐
dren and other unauthorized persons
English
16 Spark Plug
20
0458-372-0121-C
