Spark Arresting Screen In Muffler; Catalytic Converter; Spark Plug - Stihl MS 260 Instruction Manual

English
25.4 Fine Tuning for Operation at
High Altitude
A slight correction of the setting may be neces‐
sary if engine does not run satisfactorily:
► Carry out the standard setting.
► Warm up the engine.
► Turn high speed screw (H) slightly clockwise
(leaner) – no further than stop.
NOTICE
After returning from high altitude, reset the car‐
buretor to the standard setting.
If the setting is too lean there is a risk of engine
damage due to insufficient lubrication and over‐
heating.
26 Spark Arresting Screen in
Muffler
In some countries, the muffler is 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. 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
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26 Spark Arresting Screen in Muffler

► Undo screw (1)
2
► 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

27 Catalytic Converter

Power tools with a catalytic converter (depending
on model) must be run on a 50 : 1 mixture of
unleaded gasoline and STIHL two-stroke engine
oil or equivalent two-stroke engine oil – see
chapter on "Fuel".
The catayltic converter integrated in the muffler
reduces the harmful emissions in the exhaust
gas.
The correct carburetor setting (if adjustable) and
strict observance of the prescribed mix ratio of
gasoline and two-stroke engine oil are essential
to minimize harmful emissions and ensure a long
catalytic converter service life.

28 Spark Plug

► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
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0458-172-0121-A