25.2
Checking the Spark Plug
000BA039 KN
A
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
–
Too much oil in fuel mix.
–
Dirty air filter.
–
Unfavorable running conditions.
1
000BA045 KN
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.
25.3
Installing the spark plug
► Install the spark plug and connect the spark
plug boot (press it down firmly) – reassembly
all other parts in the reverse sequence.
26 Storing the Machine
For periods of about 30 days or longer
► 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 saw chain and guide bar; clean and
spray with protective oil
► Thoroughly clean the machine - pay special
attention to the cylinder fins and air filter
► When using biological chain oil (e.g. STIHL
BioPlus), fill the lubricant oil tank
► Store the machine in a dry and secure location
Keep out of the reach of children and other
unauthorized persons
27 Checking and Replacing
the Chain Sprocket
► Remove chain sprocket cover, saw chain and
guide bar.
► Release chain brake – pull hand guard against
the front handle
27.1
Fit new chain sprocket
143BA042 KN
–
after use of two saw chains or earlier
–
if the wear marks (arrows) are deeper than
0.5 mm – otherwise the service life of the saw
chain is reduced – use check gauge (special
accessory) to test
Using two saw chains in alternation helps pre‐
serve the chain sprocket
STIHL recommends use of original STIHL chain
sprockets in order to ensure optimal functioning
of the chain brake.
001BA086 KN
English
26 Storing the Machine
30
0458-206-0121-C
Summary of Contents for MS 170
Page 1: ...MS 170 180 Instruction Manual 2 40...
Page 41: ...36 EC Declaration of Conformity English 0458 206 0121 C 41...
Page 42: ...English 36 EC Declaration of Conformity 42 0458 206 0121 C...
Page 43: ...36 EC Declaration of Conformity English 0458 206 0121 C 43...
Page 44: ...www stihl com 04582060121C 04582060121C 0458 206 0121 C 0458 206 0121 C...