Instruction Manual

0023BA013-A1
► Position filter cover against the left side of the
filter housing and swing it to the right – the two
lugs (arrows) must engage the filter cover
openings.
► Depress the outer ring of the choke knob and
close the filter cover.
► Insert the screw and tighten it down firmly.
9 Adjusting the Carburetor
9.1 General Information
0000-GXX-1823-A0
This setting provides an optimum fuel-air mixture
under most operating conditions.
9.2 Preparations
► Shut off the engine.
► Check the air filter and clean or replace if nec‐
essary.
► Inspect cutting blades and clean if necessary
(clean, move freely, not warped).
9.3 Adjusting Idle Speed
Engine stops while idling
► Warm up the engine for about 3 minutes.
► Turn the idle speed screw (LA) slowly clock‐
wise until the engine runs smoothly – the cut‐
ting blades must not move.
Cutting blades run when engine is idling
► Turn the idle speed screw (LA) counterclock‐
wise until the cutting blades stop moving and
then turn the screw about another 1/2 to 3/4
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
0000-GXX-1819-A0
► 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.
English 9 Adjusting the Carburetor
14 0458-448-0121-C