► Retighten screws (1)
Only high-quality air filters should be used, to
protect the engine against ingress of abrasive
dust.
STIHL recommends the use of genuine STIHL
air filters. The high quality of these parts will
ensure trouble free operation, a long service life
for the engine and extremely long filter life.
15 STIHL Injection
STIHL Injection regulates the fuel quantity and
ignition timing for all operating states electroni‐
cally.
STIHL Injection stands for easy, fast starting,
constant optimum engine performance, outstand‐
ing acceleration and automatic adaptation to
changes in operating conditions.
16 Spark Arresting Screen in
Muffler
In some countries, the mufflers are fitted with a
spark arresting screen.
WARNING
To reduce the risk of fire caused by hot particles
escaping from the machine, never operate the
machine without a spark arresting screen, or with
the spark arresting screen damaged. Do not
modify the muffler or spark arresting screen.
NOTICE
According to the law or regulations in some
countries or federal states, certain operations
may only be carried out if a properly serviced
spark arresting screen is provided.
► If the engine performance deteriorates, check
the spark arresting screen in the muffler.
WARNING
Wait for the engine to cool down completely
before performing this work.
2
370BA031 KN
1
► Undo screw (1)
► Pull the spark arresting screen (2) upward out
of the muffler
► clean the spark arresting screen if necessary
► If the screen is damaged or heavily carbon‐
ized, fit a new one
► Refit the spark arresting screen in reverse
order of stepsRefit the spark arresting screen
in reverse order of steps
17 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".
17.1
Removing the spark plug
► Switch off the engine – move stop switch to
STOP or 0
1307BA030 KN
1
2
► Unscrew screw (1) and remove cap (2) –
screw (1) is secured in the cap (2) to prevent
loss
15 STIHL Injection
English
0458-753-8321-C
27
