Spark Arresting Screen In Muffler; Spark Plug - Stihl MS 231 Instruction Manual

English
NOTICE
After descending from a high altitude, restore the
carburetor setting to the standard setting.
If you make the setting too lean it will increase
the risk of engine damage through lack of lubri‐
cation and overheating.
25 Spark Arresting Screen in
Muffler
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. To
reduce the risk of fire from accumulated debris
such as pine needles, branches or leaves,
ensure that the muffler plugs are in place before
taking up work.
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 is down on power, check the
spark arresting screen in the muffler
► Wait for the muffler to cool down
1
► Undo screw (1)
► Pull out the spark arresting screen (2)
► Clean the dirty spark arresting screen, replace
if damaged or heavily carbonized
► Refit the spark arresting screen
► Insert the screw
► If the muffler plugs are missing or damaged,
install new plugs
32

26 Spark Plug

► If the engine is down on power, difficult to start
► Fit a new spark plug after about 100 operating
26.1
► Remove the shroud – see "Shroud"
► Pull off the spark plug boot
► Unscrew spark plug
26.2
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
2
► Rectify the problems which have caused foul‐
Possible causes are:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.

25 Spark Arresting Screen in Muffler

or runs poorly at idle speed, first check the
spark plug.
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
Removing the spark plug
Checking the Spark Plug
sary – see "Specifications".
ing of the spark plug.
A
0458-737-8321-C