Instruction Manual

MS 661 C-M
English
34
N Release chain brake.
NOTICE
If the throttle trigger is released before
the chain saw has been fully calibrated,
calibration will be aborted. Calibration
has to be started again from the
beginning.
N Fully depress throttle trigger and
hold it there.
NOTICE
If the throttle trigger is not fully
depressed during calibration, the chain
saw may not adjust correctly. The chain
saw may be damaged.
N Fully depress throttle trigger and
hold it there.
N Depress and hold down throttle
trigger for at least 30 seconds (B).
The engine accelerates and the saw
chain rotates. The chain saw is being
calibrated. The engine speed fluctuates
and increases perceptibly during
calibration.
If the engine stops:
N try again to calibrate the chain saw.
If the engine repeatedly stops:
N Engage chain brake.
N Do not use the chain saw. Consult a
STIHL servicing dealer. The chain
saw has a fault.
As soon as the engine speed audibly
and perceptibly drops (C):
N Release throttle trigger.
The engine idles. The chain saw is
calibrated and ready for use.
N If engine performance deteriorates,
check the spark arresting screen in
the muffler
N Let the muffler cool down
N Remove four screws
N Remove exhaust casing (1) of the
muffler
N Bend back the retaining lugs (2)
N Pull out spark arresting screen (3)
N Clean the dirty spark arresting
screen, replace if damaged or
heavily carbonised
N Refit the spark arresting screen in
reverse order of steps
Spark Arresting Screen in
Muffler
1
1166BA016 AM
1166BA017 AM
2
3