Instruction Manual

WARNING
If the cutting attachment continues to rotate
when the engine is idling, have your machine
checked and repaired by your servicing dealer.
12.7.3 Erratic idling behavior, poor accelera‐
tion (despite correction to setting of LA
screw).
Idle setting is too lean
Carburetor1
► Turn the low speed screw (L) carefully coun‐
terclockwise, no further than stop, until the
engine runs smoothly and still accelerates sat‐
isfactorily.
Carburetor2
► Rotate the low speed screw (L) slowly
about 1/4 turn counterclockwise until the
engine runs smoothly and still accelerates sat‐
isfactorily.
12.7.4 Erratic idling behavior
Idle setting is too rich
Carburetor1
► Turn the low speed screw (L) slowly clock‐
wise, no further than stop, until the engine
runs smoothly and still accelerates satisfacto‐
rily.
Carburetor2
► Rotate the low speed screw (L) slowly
about 1/4 turn clockwise until the engine runs
smoothly and still accelerates satisfactorily.
It is usually necessary to change the setting of
the idle speed screw (LA) after every correction
to the low speed screw (L).
12.8 Fine Tuning for Operation at
High Altitude
A slight correction of the setting may be neces‐
sary if engine does not run satisfactorily:
Carburetor1
► Carry out the standard setting.
► Warm up the engine.
► Turn high speed screw (H) slightly clockwise
(leaner) – no further than stop.
Carburetor2
► Carry out the standard setting.
► Warm up the engine.
► Turn high speed screw (H) slightly clockwise
(leaner) – no more than a 3/4 turn.
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.
13 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".
13.1 Removing the Spark Plug
► Move the stop switch to 0.
1
232BA081 KN
► Pull off the spark plug boot (1).
► Unscrew the spark plug.
13.2 Checking the Spark Plug
000BA039 KN
A
► 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.
English 13 Spark Plug
20 0458-232-8321-F