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23 Spark Plug
► Turn the idle speed screw (LA) clockwise until
the chain begins to run – then back it off 1/2
turn.
22.3.2
Saw chain runs while engine is idling
► Set the low speed screw (L) to 1/4 turn open.
► Turn the idle speed screw (LA) counterclock‐
wise until the chain stops running – then turn it
another 1/2 turn in the same direction.
WARNING
If the chain continues moving when the engine is
idling, have your saw checked and repaired by
your servicing dealer.
22.3.3
Erratic idling behavior, poor accelera‐
tion (even though low speed screw is
open 1/4 turn)
Idle setting is too lean
► Turn the low speed screw (L) counterclock‐
wise, no further than stop, until the engine
runs and accelerates smoothly.
It is usually necessary to change the setting of
the idle speed screw (LA) after every correction
to the low speed screw (L).
22.4
Fine Tuning for Operation at
High Altitude
A slight correction of the setting may be neces‐
sary if engine does not run satisfactorily:
► Carry out the standard setting.
► Warm up the engine.
► Turn high speed screw (H) slightly clockwise
(leaner) – no further than stop.
NOTICE
After returning from high altitude, reset the car‐
buretor to the standard setting.
If the setting is too lean there is a risk of engine
damage due to insufficient lubrication and over‐
heating.
23 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".
0458-212-0121-C
23.1
Removing the spark plug
► Move the Master Control lever to stop posi‐
tion (0).
► Loosen the twist lock (1) in the direction of the
arrow.
► Remove the carburetor box cover (2).
► Pull off the spark plug boot.
► Unscrew the spark plug.
23.2
Checking the Spark Plug
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.
English
1
2
A
29
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