Winter Operation; Starting / Stopping The Engine - Stihl MS 291 Instruction Manual

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Winter Operation

Pre-heat carburetor
Remove the shroud – see "Shroud"
N
At temperatures below +10 °C
Using the combination wrench or a
N
screwdriver, pry the shutter out of
the s (summer operation) position
1
Place the shutter with the opening in
N
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.
28
Fit the shroud – see "Shroud"
N
Heated air is now drawn in from around
the cylinder and circulates around the
carburetor – this helps prevent
carburetor icing.
At temperatures above +20 °C
Ensure that the shutter is set back to
N
position s (summer operation)
without fail, otherwise the engine
may malfunction due to overheating
At temperatures below -10 °C
In case of erratic idling behavior or poor
acceleration
Turn the low speed screw (L)
N
1/4 turn counterclockwise
Whenever the low speed screw (L) has
been adjusted, it is usually also
necessary to adjust the idle speed
screw (LA), see "Setting the carburetor".
if the chain saw is extremely cold
N
(frost formation) – after starting,
bring the engine up to operating
temperature at increased idle speed
(disengage chain brake!)
Air filter system
Retrofit new air filter if necessary –
N
see "Air filter system"
Starting / Stopping the
Engine
Positions of the master control lever
STOP
0
Stop 0 – engine off – ignition is switched
off
Run F – Engine running or can start
Warm start n – this position is for
starting the warm engine – the master
control lever returns to run when the
throttle trigger is squeezed
Cold start l – this position is for
starting the cold engine
MS 271, MS 271 C, MS 291, MS 291 C