Adjusting The Carburetor; Spark Arresting Screen In Muffler - Stihl MS 170 Notice D'emploi

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Adjusting the Carburetor

Basic information
The carburetor has been factory-
adjusted to provide the engine with a
optimal fuel-air mixture in all operating
states.
Standard setting
Check the air filter - replace if
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necessary
Check spark arresting screen –
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clean or replace it if necessary
Carefully screw the idle speed
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screw (LD) down counterclockwise
(left-hand thread) until it is firmly
seated, then 2 turns clockwise
(standard setting LD = 2)
Setting the idle speed
Start and warm up the engine
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Using the idle speed screw (LD), set
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the idle speed correctly: The saw
chain must not rotate
Engine speed too low when idling:
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Turn the idle speed adjusting
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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
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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.
Spark Arresting Screen in
Muffler
In some countries the muffler is
equipped with a spark arresting screen.
If the engine is down on power,
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check the spark arresting screen in
the muffler.
Wait for the muffler to cool down.
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3
4
Take out the screws (1) and remove
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the cover (2).
Remove the spark arresting screen
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(3) from the muffler (4).
Clean the spark arresting screen. If
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the screen is damaged or heavily
carbonized, fit a new one.
Refit the spark arresting screen –
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place the cover in position and
secure it with the screws.
MS 170, MS 170 C, MS 180, MS 180 C
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