English
N
Turn the high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
Fine tuning for operation at high
altitude
Spark Arresting Screen in
Muffler
N
Turn the low speed screw (L)
carefully clockwise as far as stop,
then turn it back 1 full turn.
In some countries the muffler is
equipped with a spark arresting screen.
If idling behavior is erratic or
acceleration is poor
N
If the engine is down on power,
check the spark arresting screen in
the muffler.
N
N
Warm up the engine.
Adjusting idle speed
Turn the low speed screw (L) 1/8 of
a turn (45°) counterclockwise.
N
Wait for the muffler to cool down.
It is usually necessary to change the
setting of the idle speed screw (LA) after
every correction to the low speed
screw (L).
Engine stops while idling
N
Open the low speed screw (L) one
full turn.
1
N
Turn the idle speed screw (LA)
clockwise until the chain begins to
run – then back it off 1 1/2 turns.
A slight correction of the setting may be
necessary if the engine does not run
satisfactorily:
2
N
Turn high speed screw (H)
clockwise (leaner) – no further than
stop.
Chain runs when engine is idling
N
Open the low speed screw (L) one
full turn.
N
N
Take out the screw (1).
If the setting is too lean there is a
risk of engine damage due to
insufficient lubrication and
overheating.
Pull out the spark arresting
screen (2).
N
Turn the idle speed screw (LA)
counterclockwise until the chain
begins to run – then turn it another
N
Clean the spark arresting screen. If
the screen is damaged or heavily
carbonized, fit a new one.
1
1/2 turns in the same direction.
If the chain continues moving
when the engine is idling, have
your saw checked and repaired by
your servicing dealer.
N
N
Refit the spark arresting screen.
Insert the screw and tighten it down.
Erratic idling behavior, poor
acceleration (even though low speed
screw is open one turn)
N
Idle setting is too lean: Turn the low
speed screw (L) counterclockwise
until the engine runs and
accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA) after
every correction to the low speed
screw (L).
3
8
MS 311, MS 391
| Categories | Chainsaw Manuals, STIHL Chainsaw Manuals |
|---|---|
| Tags | STIHL MS 311, STIHL MS 391 |
| Download File |
|
| Language | English, Español |
| Product Brand | STIHL. Stihl Inc, USA - Corporate phone: (757) 486-9100. International Support Information: http://stihl.com Email: info@stihl.com, Chainsaw |
| Document File Type | |
| Publisher | stihl.com |
| Wikipedia's Page | Stihl |
| Copyright | Attribution Non-commercial |
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