Instruction Manual

► Fit the foam element (3) in the filter cover (2)
and the felt element (4) in the filter housing
(5).
► Close the filter cover so that it snaps into posi‐
tion.
9 Adjusting the Carburetor
The carburetor has been set at the factory to pro‐
vide an optimum fuel-air mixture under most
operating conditions.
9.1 Adjusting Idle Speed
LA
0000-GXX-8513-A0
H
L
► Start and warm up the engine.
9.1.1 Engine stops while idling
► Turn the idle speed screw (LA) slowly clock‐
wise until the engine runs smoothly – the cut‐
ting blades must not run.
9.1.2 Cutting blades run when engine is
idling
► Turn the idle speed screw (LA) counterclock‐
wise until the cutting blades stop moving –
then turn it another 1/2 to 1 turn in the same
direction.
WARNING
If the cutting blades continue to run while the
engine is idling, have your power tool checked
and repaired by your servicing dealer.
10 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".
10.1 Removing the Spark Plug
► Move the stop switch to
O.
253BA030 ST
► Pull off the spark plug boot.
► Unscrew the spark plug.
10.2 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.
–
Unfavorable running conditions.
1
000BA045 KN
English 9 Adjusting the Carburetor
12 0458-253-0121-D