MS 661 C-M
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 the carburettor at temperatures
under +50 F (+10°C)
N Remove the filter cover
N in the filter cover, move the slide (1)
from summer position to winter
position (2)
Heated air is now drawn in from around
the cylinder and mixed with cold air – this
helps prevent carburettor icing.
N At temperatures above +70 F
(+20°C): always return the slide to
the summer position –
NOTICE
otherwise risk of engine malfunction due
to overheating!
If engine trouble occurs, first return the
slide from winter to summer position.
At temperatures below +14 F (
-
10°C)
Under extreme winter conditions
(temperatures below +14 F (
-
10°C),
powdered or drifting snow), it is
recommended to mount the cover plate
(special accessory) on the fan housing.
The partial covering of the slits in the fan
housing keeps out powdered or drifting
snow.
N If the chain saw is extremely cold
(frost formation) – after starting,
bring the engine up to operating
temperature at medium speed
(disengage chain brake!)
Full-time usage: every 3
months
Part-time usage: every 6
months
Occasional usage: every 12
months
Winter Operation
1
2
1166BA031 AM
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