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.
19.3 Installing the spark plug
► Screw in spark plug
► Firmly press the spark plug connector onto the
spark plug.
► Align the spark plug connector so that the igni‐
tion cable points to the upper left corner
(arrow).
► Place the cap (1) on the hood from behind and
at a slight angle, pressing the nose (2) into the
opening (3) of the hood.
► On the front, swivel the cap onto the hood,
screw in the screw (4) and tighten.
20 Engine Running Behavior
If engine running behavior is still unsatisfactory
after the air filter has been serviced and the car‐
buretor and throttle cable have been adjusted
correctly, the cause may also be in the muffler.
Have the muffler checked for contamination (cok‐
ing) by a servicing dealer!
STIHL recommends that maintenance and repair
work be carried out only by authorized STIHL
dealers.
21 Storing the Machine
If out of use for periods of about 30 days or lon‐
ger
► Drain and clean the fuel tank in a well-ventila‐
ted area.
► Dispose of fuel properly in accordance with
local environmental requirements.
► If a manual fuel pump is fitted: Press the man‐
ual fuel pump at least 5 times.
► Start the engine and run it at idling speed until
it stops
► Remove, clean and inspect the cutting attach‐
ment. Treat metal cutting attachments with
protective oil.
► Thoroughly clean the machine
► Store the machine in a dry and safe place, out
of the reach of children and other unauthor‐
ized users
22 Sharpening Metal Cutting
Blades
► Use a sharpening file (see "Special Accesso‐
ries") to sharpen dull cutting attachments. In
case of more serious wear or nicks:
Resharpen with a grinder or have the work
done by a dealer – STIHL recommends a
STIHL servicing dealer.
► Sharpen frequently, take away as little metal
as possible – two or three strokes of the file
are usually enough.
English 20 Engine Running Behavior
36 0458-743-0121-E