Instruction Manual

MS 271, MS 271 C, MS 291, MS 291 C
English
35
Pre-heat carburetor
N Remove the shroud – see "Shroud"
At temperatures below +10 °C
N Using the combination wrench or a
screwdriver, pry the shutter out of
the s (summer operation) position
N Place the shutter 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 +20 °C
N Ensure that the shutter is set back to
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
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
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"
During the break-in period
A factory new machine should not be run
at high revs (full throttle off load) for the
first three tank fillings. This avoids
unnecessarily high loads during the
break-in period. As all moving parts
have to bed in during the break-in
period, the frictional resistances in the
shortblock are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
During work
NOTICE
Do not make the mixture leaner to
achieve an apparent increase in power –
this could damage the engine – see
"Adjusting the Carburetor".
NOTICE
Open the throttle only when the chain
brake is off. Running the engine at high
revs with the chain brake engaged
(chain locked) will quickly damage the
shortblock and chain drive (clutch, chain
brake).
Check chain tension frequently
A new saw chain must be retensioned
more frequently than one that has been
in use already for an extended period.
Winter Operation
5902BA002 KN
5902BA003 KN
1
Operating Instructions