Spark Arresting Screen In Muffler; Spark Plug - Stihl MS 170 Instruction Manual

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.
MS 170, MS 170 C, MS 180, MS 180 C
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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1
1
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.

Spark Plug

If the engine is down on power,
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difficult to start or runs poorly at idle
speed, first check the spark plug.
Fit a new spark plug after about 100
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operating hours – or sooner if the
electrodes are badly eroded. Install
only suppressed spark plugs of the
type approved by STIHL – see
"Specifications".
Removing the spark plug
Simultaneously press the throttle
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trigger lockout and throttle trigger
and set the Master Control lever to
cold start l
Remove the shroud – see "Shroud"
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2
Pull off the spark plug boot
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Unscrew spark plug
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English
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