Stihl MS 250 Notice D'emploi page 27

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:
Full-time usage: every 3
months
Part-time usage: every 6
months
Occasional usage: every 12
months
MS 250
Winter Operation
At temperatures below +10°C
Press down the throttle trigger
N
lockout and move the Master
Control lever to choke closed l.
Turn the knob above the rear handle
N
90° counterclockwise.
Lift off the carburetor box cover
N
vertically.
Lift out the shutter (in front of spark
N
plug) vertically.
Turn the shutter 180°.
N
Refit the shutter.
N
Refit the carburetor box cover and
N
secure it with the knob.
Heated air is now drawn in from around
the cylinder to warm the carburetor – this
helps prevent carburetor icing.
NOTICE
At temperatures above + 20°C, always
close the shutter again. This is
necessary to avoid engine running
problems and overheating.
English
25