Stihl MS 291 Product Instruction Manual - Page 35

Winter Operation - air filter

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felling cut. The chain brake will operate only if it has been properly maintained and the hand guard has not been modified in any way. Check operation of chain brake Before starting work: Run engine at idle speed, engage the chain brake (push hand guard toward bar nose). Accelerate up to full throttle for no more than 3 seconds - the chain must not rotate. The hand guard must be free from dirt and move freely. Chain brake maintenance The chain brake is subject to normal wear. It is necessary to have it serviced and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals: Full-time usage: Part-time usage: Occasional usage: every 3 months every 6 months every 12 months Winter Operation Pre-heat carburetor N Remove the shroud - see "Shroud" At temperatures below +50 °F (+10 °C) N Using the combination wrench or a screwdriver, pry the shutter out of the s (summer operation) position 1 N Place the slide with the opening in the direction of the chain saw (winter operation) - arrow points toward symbol r - shutter must audibly snap into place 5902BA003 KN 5902BA002 KN English In the winter operation position, the tip of the arrow (1) is visible. N Fit the shroud - see "Shroud" Heated air is now drawn in from around the cylinder and circulates around the carburetor - this helps prevent carburetor icing. At temperatures above +70 °F (+20 °C) N Ensure that the slide is set back to position s (summer operation) without fail, otherwise the engine may malfunction due to overheating At temperatures below +14 °F (-10 °C) In case of erratic idling behavior or poor acceleration N Turn the low speed screw (L) 1/4 turn counterclockwise Whenever the low speed screw (L) has been adjusted, it is usually also necessary to adjust the idle speed adjusting screw (LA), see "Setting the carburetor". N if the chain saw is extremely cold (frost formation) - after starting, bring the engine up to operating temperature at increased idle speed (disengage chain brake!) Air filter system N Retrofit new air filter if necessary - see "Air filter system" MS 271, MS 291, MS 291 C 33

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MS 271, MS 291, MS 291 C
English
33
felling cut. The chain brake will operate
only if it has been properly maintained
and the hand guard has not been
modified in any way.
Check operation of chain brake
Before starting work: Run engine at idle
speed, engage the chain brake (push
hand guard toward bar nose).
Accelerate up to full throttle for no more
than 3 seconds – the chain must not
rotate. The hand guard must be free
from dirt and move freely.
Chain brake maintenance
The chain brake is subject to normal
wear. It is necessary to have it serviced
and maintained regularly by trained
personnel, such as your STIHL servicing
dealer, at the following intervals:
Pre-heat carburetor
N
Remove the shroud – see "Shroud"
At temperatures below +50 °F
(+10 °C)
N
Using the combination wrench or a
screwdriver, pry the shutter out of
the
s
(summer operation) position
N
Place the slide with the opening in
the direction of the chain saw
(winter operation) – arrow points
toward symbol
r
– shutter must
audibly snap into place
In the winter operation position, the tip of
the arrow (1) is visible.
N
Fit the shroud – see "Shroud"
Heated air is now drawn in from around
the cylinder and circulates around the
carburetor – this helps prevent
carburetor icing.
At temperatures above +70 °F
(+20 °C)
N
Ensure that the slide is set back to
position
s
(summer operation)
without fail, otherwise the engine
may malfunction due to overheating
At temperatures below +14 °F (-10 °C)
In case of erratic idling behavior or poor
acceleration
N
Turn the low speed screw (L)
1/4 turn counterclockwise
Whenever the low speed screw (L) has
been adjusted, it is usually also
necessary to adjust the idle speed
adjusting screw (LA), see "Setting the
carburetor".
N
if the chain saw is extremely cold
(frost formation) – after starting,
bring the engine up to operating
temperature at increased idle speed
(disengage chain brake!)
Air filter system
N
Retrofit new air filter if necessary –
see "Air filter system"
Full-time usage:
every 3
months
Part-time usage:
every 6
months
Occasional usage:
every 12
months
Winter Operation
5902BA002 KN
5902BA003 KN
1