Stihl MS 271 Notice D'emploi page 32

English
26.3 Standard setting
H
► Turn the high speed adjusting screw (H) coun‐
terclockwise as far as possible (max. 3/4 turn)
► Turn the low speed adjusting screw (L) clock‐
wise as far as possible – then turn it 1/4 turn
counterclockwise
26.4 Setting the idle speed
► Make standard setting
► Start engine and let it warm up
LA
26.4.1 Engine stops when idling
► Turn the idle speed adjusting screw (LA)
clockwise until the saw chain begins to rotate
– then turn it back 1 turn
26.4.2 Saw chain rotates at idle speed
► Turn the idle speed screw (LA) counterclock‐
wise until the saw chain stops turning – then
turn another full 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.
26.4.3 Speed erratic when idling; poor accel‐
eration (despite standard setting of low
speed adjusting screw)
The idle setting is too lean.
► Carefully turn the low speed adjusting
screw (L) counterclockwise until the engine
32
L
27 Spark Arresting Screen in Muffler
runs and accelerates smoothly – but no further
than the stop
Whenever the low speed adjusting screw (L) has
been adjusted, it is usually also necessary to
readjust the idle speed adjusting screw (LA).
26.5 Correcting the carburetor set‐
ting for use at high altitudes
The setting may have to be marginally corrected
if engine performance is unsatisfactory at high
altitudes:
► Make standard setting
► Let the engine warm up
► Turn the high speed adjusting screw (H)
slightly clockwise (leaner) – max. up to the
stop
NOTICE
After descending from a high altitude, restore the
carburetor setting to the standard setting.
If you make the setting too lean it will increase
the risk of engine damage through lack of lubri‐
cation and overheating.
27 Spark Arresting Screen in
Muffler
WARNING
To reduce the risk of fire caused by hot particles
escaping from the machine, never operate the
machine without a spark arresting screen, or with
the spark arresting screen damaged. Do not
modify the muffler or spark arresting screen. To
reduce the risk of fire from accumulated debris
such as pine needles, branches or leaves,
ensure that the muffler plugs are in place before
taking up work.
NOTICE
According to the law or regulations in some
countries or federal states, certain operations
may only be carried out if a properly serviced
spark arresting screen is provided.
► If the engine is down on power, check the
spark arresting screen in the muffler
► Wait for the muffler to cool down
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