Spark Plug - Stihl MS 261 C-M Instruction Manual

27 Spark Plug

► If the STIHL M‑Tronic version is lower than
3.0: "Speeding up automatic adaptation of the
chain saw".
► If the STIHL M‑Tronic version is 3.0 or higher:
"Calibrating the chain saw".
26.1 Speeding Up Automatic Adap‐
tation of the Chain Saw
► Carry out five uniform cuts to length at full
throttle.
26.2 Calibrating the Chain Saw
If the external temperature is below -10°C or the
engine is cold:
► Start engine and release chain brake.
► Warm up engine for about 1 minute by blip‐
ping the throttle.
► Switch off engine.
To calibrate the chain saw, carry out the follow‐
ing steps:
A
1
min
30-60 s
► Set master control lever to } position.
► Engage chain brake.
► Start engine without depressing the throttle
trigger. The engine runs and the master con‐
trol lever remains in the } position.
► 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 Instruc‐
tion Manual and do not touch the moving saw
chain.
► Release chain brake.
0458-153-0121-C
B C
> 30 s s
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.
► 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 cor‐
rectly. The chain saw may be damaged.
► Fully depress throttle trigger and hold it there.
► 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 percepti‐
bly during calibration.
If the engine stops:
► try again to calibrate the chain saw.
If the engine repeatedly stops:
► Engage chain brake.
► 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 per‐
ceptibly drops (C):
► Release throttle trigger.
The engine idles. The chain saw is calibrated
and ready for use.
27 Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► Fit a new spark plug after about 100 operating
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
27.1 Removing the Spark Plug
► Remove the shroud – see "Shroud".
English
31