► Carry out the following measures:
► Replace the air filter.
► Clean or replace the spark plug.
► Adjust saw for winter or summer operation.
► If the problem continues: Carry out the measured listed below.
Fault Cause Remedy
The engine does not
start.
There is not enough
fuel in the fuel tank.
► Prepare fuel mix and refuel the trimmer.
The carburetor is too
hot.
► Allow trimmer to cool down.
► Depress the manual fuel pump at least 10 times
before starting the engine.
The carburetor has
iced up.
► Allow trimmer to warm up to +10°C.
The engine idles
erratically.
The carburetor has
iced up.
► Allow trimmer to warm up to +10°C.
The engine stops
while idling.
The carburetor has
iced up.
► Allow trimmer to warm up to +10°C.
The engine does not
reach maximum
speed.
Trimmer is not cor‐
rectly tuned to ambi‐
ent conditions.
► Calibrate the brushcutter.
Throttle cable is not
correctly adjusted.
► Adjust the throttle cable.
The engine switches
off although there is
still fuel in the fuel
tank.
The pickup body is
not located in the
right place.
► Contact a STIHL servicing dealer.
18.2 Replacing air filter
The air filter cannot be cleaned. The air filter
must be replaced if it is damaged or there is a
loss of engine power.
► Shut off the engine.
►
Move the choke lever to position
.
► Take out the screws (1) and remove the filter
cover (2).
► Clean the area around the air filter (3) with a
damp cloth or a soft brush.
► Take out the air filter (3).
► Install the new air filter (3).
► Fit the filter cover (2).
► Insert screws (1) and tighten.
18.3 Cleaning the Spark Plug
► Shut off the engine.
► Allow trimmer to cool down.
► Turn screw (1) counterclockwise.
► Lift the cover (2) and push it backwards.
► Pull off the spark plug boot (3).
► If the area around the spark plug (4) is soiled:
Clean the spark plug (4) with a cloth.
► Unscrew the spark plug (4).
► Clean the spark plug (4) with a cloth.
► If the spark plug (4) is corroded: Install a new
spark plug (4).
► Insert and tighten down the spark plug (4)
firmly.
► Press the spark plug boot (3) firmly home.
► Install cover (2) and tighten screw (1).
English 18 Troubleshooting
20 0458-844-0101-A
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