11.1
If there is a noticeable loss of
engine power
1
1
2
3
4
6162BA007 AM
► Turn the choke knob to
g
.
► Take out the screws (1).
► Remove the filter cover (2).
► Clean away loose dirt from around the filter.
► Remove the filter element (3).
► Replace dirty or damaged filters.
► Replace any damaged parts.
► Fit the new air filter in the filter housing (4).
► Fit the filter cover.
► Fit the screws and tighten them down firmly.
12 Adjusting the Carburetor
0208BA036 KN
The carburetor has been set at the factory to pro‐
vide an optimum fuel-air mixture under most
operating conditions.
12.1
Adjusting Idle Speed
Engine stops while idling
► Turn the idle speed screw (LA) slowly clock‐
wise until the engine runs smoothly.
Attachment runs when engine is idling
► Turn the idle speed screw (LA) slowly counter‐
clockwise until the attachment stops running.
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
1
0208BA037 KN
2
► Turn screw (1) in cap (2) until cap can be
removed
► Lay down cap
3
0208BA038 KN
► Pull off the spark plug boot (3)
► Unscrew 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.
–
Dirty air filter.
English
12 Adjusting the Carburetor
16
0458-422-0121-D