Spark Arresting Screen* In Muffler; Catalytic Converter; Checking The Spark Plug - Stihl MS 170 Manual De Instrucciones

English / USA
Spark Arresting Screen*
in Muffler
1
1
3
4
If the engine is low on power, check the
spark arresting screen* in the muffler.
: Take out the screws (1) and remove
the cover (2).
: Remove the spark arresting
screen (3) from the muffler (4).
: Clean the spark arresting screen
if necessary.
: If screen is damaged or coked up,
fit a new one.
: Refit the spark arresting screen,
place the cover in position and
secure with the screws.
* see "Guide to Using this Manual"
44

Catalytic Converter*

Units with a catalytic converter* may
only be operated with unleaded
gasoline and STIHL two cycle engine
oil or equivalent quality two cycle engine
oils in a mix ratio of 50:1 (see chapter
"Fuel").
The catalylic converter in the muffler
reduces noxious emissions in the
exhaust gas.
Correct adjustment of the carburetor (if
adjustable) and observance of the
specified mix ratio of gasoline and two
cycle engine oil are essential to
2
minimize harmful exhaust emissions
and ensure a long catalyst service life.
* see "Guide to Using this Manual"

Checking the Spark Plug

Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition of
the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
MS 170, MS 180, MS 180 C