MS 650, MS 660
English
20
The chain brake will operate only if the
hand guard has not been modified in any
way.
Check operation of the chain brake
Before starting work: Run engine at idle
speed, engage the chain brake (push
hand guard toward bar nose) and open
the throttle wide 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. STIHL recommends that you
have servicing and repair work carried
out exclusively by an authorized STIHL
servicing dealer. Maintain the following
servicing intervals:
At temperatures below +10 °C
N Remove the carburetor box cover
N in the carburetor box 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 carburetor icing.
N Replace the carburetor box cover
and tighten the knob
Air filter system
N Retrofit new air filter if necessary –
see "Air filter system"
At temperatures below -10 °C
Under extreme winter conditions
(temperatures below -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.
When the cover plate is mounted, the
slide must be in winter position in the
carburetor box cover.
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!)
N If engine trouble occurs, first check
whether use of the cover plate is
necessary
Full-time usage: every 3
months
Part-time usage: every 6
months
Occasional usage: every 12
months
Winter Operation
Above +20 °C: Always return the
shutter to the position for "summer
operation" again! Risk of engine
malfunction – overheating!
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