Instruction Manual

MS 661 C-M
English
33
If there is a noticeable loss of engine
power:
N Wash the filter in STIHL special-
purpose cleaner (special
accessory) or a clean, non-
flammable cleaning liquid (e.g.,
warm soapy water) – rinse the filter
from inside to out under a water jet
– do not use high-pressure cleaners
N Dry all filter parts – do not expose to
extreme heat
N Do not oil the filter
N Reinstall filter
During operation the chain saw
automatically adjusts to the optimum
power.
Depending on the STIHL M-Tronic
version the chain saw can be adjusted
more quickly to the optimum power in
two different ways:
– “Speeding up automatic adaptation
of the chain saw”
– “Calibrating the chain saw”
The STIHL M-Tronic version is indicated
on the approval label of the chain saw,
e.g. "M3.0" indicates the
STIHL M-Tronic version 3.0.
N If the STIHL M-Tronic version is
lower than 3.0: “Speeding up
automatic adaptation of the chain
saw”.
N If the STIHL M-Tronic version is 3.0
or higher: “Calibrating the chain
saw”.
Speeding Up Automatic Adaptation of
the Chain Saw
N Carry out five uniform cuts to length
at full throttle.
Calibrating the Chain Saw
If the external temperature is below -
10°C or the engine is cold:
N Start engine and release chain
brake.
N Warm up engine for about 1 minute
by blipping the throttle.
N Switch off engine.
To calibrate the chain saw, carry out the
following steps:
N Set master control lever to }
position.
N Engage chain brake.
N Start engine without depressing the
throttle trigger. The engine runs and
the master control lever remains in
the } position.
N Allow engine to run for at least 30 to
max. 60 seconds (A) without
depressing the throttle trigger.
WARNING
The saw chain may rotate when the
chain brake is released - risk of injury!
Hold the chain saw as described in the
Instruction Manual and do not touch the
moving saw chain.
Cleaning the Air Filter M-Tronic
Andreas Stihl AG & Co. KG
XXXX XXX XXXX X M3.0
0000-GXX-3485-A0
1
min
AB C
s> 30 s30-60 s
0000-GXX-4580-A0