207BA028 KN
► Pull the filter upwards to remove
► Knock out the filter or blow it clear with com‐
pressed air from the inside outwards - do not
wash
Do not clean fleece filters with a brush!
If the filter cannot be cleaned or is damaged,
replace the filter
► Reinstall air filter
24 Adjusting the Carburetor
24.1
Basic information
The carburetor has been factory-adjusted to pro‐
vide the engine with a optimal fuel-air mixture in
all operating states.
207BA029 KN
24.2
Standard setting
► Check the air filter - replace if necessary
► Carefully screw the idle speed screw (LD)
down counterclockwise (left-hand thread) until
it is firmly seated, then 2 turns clockwise
(standard setting LD = 2)
24.3
Setting the idle speed
► Start and warm up the engine
► Using the idle speed screw (LD), set the idle
speed correctly: The saw chain must not
rotate
Engine speed too low when idling:
► Turn the idle speed adjusting screw (LD)
slowly clockwise until the saw chain begins to
rotate – then back off 1/2 turn
Saw chain rotates at idle speed:
► Turn the idle speed adjusting screw (LD)
slowly counterclockwise until the saw chain
stops rotating – then turn an additional 1/2 turn
in the same direction
WARNING
If the saw chain continues to keep rotating in idle
even after adjustment, have the chain saw
checked by a servicing dealer.
25 Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► Fit a new spark plug after about 100 operating
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
25.1
Removing the spark plug
► Simultaneously press the throttle trigger lock‐
out and throttle trigger and set the Master
Control lever to cold start
l
► Remove the shroud – see "Shroud"
MS 170, MS 180
207BA036 KN
MS 170 2-MIX, 180 2-MIX
207BA030 KN
► Pull off the spark plug boot
► Unscrew spark plug
24 Adjusting the Carburetor
English
0458-206-0121-C
29
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...