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► Pull the trigger (1) and hold it there without
depressing the lockout lever (2).
► Turn screw (3) clockwise until the engine
accelerates.
► Turn screw (3) back 2 turns counterclockwise.
The engine idles and the throttle cable adjust‐
ment is correct.
► Shut off the engine.
17.5
Sharpening and Balancing a
Metal Cutting Attachment
Correctly sharpening and balancing metal cutting
attachments requires a lot of practice.
19 Troubleshooting
19.1
Troubleshooting Trimmer
Most malfunctions have the same causes.
► Perform the following operations:
► Clean the air filter.
► Clean or replace the spark plug.
► Carry out the standard setting.
► Adjust idle speed.
► Adjust carburetor for operation at high altitude.
► If the malfunction still exists: Take the action described in the following table.
Condition
Engine does not
start.
Engine idles errati‐
cally.
Engine stops while
idling
Cutting attachment
does not rotate prop‐
erly or rotates errati‐
cally.
19.2
Standard Setting
► Shut off the engine.
H
20
Cause
Insufficient fuel in the
tank.
Engine is flooded.
Carburetor is too hot. ► Allow trimmer to cool down.
Carburetor is iced up. ► Allow trimmer to warm up to +10°C.
Carburetor is iced up. ► Allow trimmer to warm up to +10°C.
Carburetor is iced up. ► Allow trimmer to warm up to +10°C.
Connection between
flexible shaft and
powerhead or drive
tube is worn.
L
STIHL recommends you have metal cutting
attachments resharpened and balanced by a
STIHL servicing dealer.
18 Repairing
18.1
Repairing the Trimmer and
Cutting Attachment
The trimmer and cutting attachment cannot be
repaired by the user.
► If the trimmer or cutting attachment is dam‐
aged: Do not use your trimmer or cutting
attachment and contact your STIHL servicing
dealer.
Remedy
► Prepare fuel mix and refuel the trimmer.
► Clear the combustion chamber.
► Before starting the engine: Depress the manual fuel
pump bulb at least ten times.
► Contact your STIHL servicing dealer for assistance.
► Turn the high speed screw (H) counterclock‐
wise as far as stop.
► Turn the low speed screw (L) clockwise as far
as stop.
► Turn the low speed screw (L) 3/4 of a turn
counterclockwise.
19.3
Adjusting Idle Speed
► Carry out the standard setting.
► Start the engine.
► Warm up the engine by opening and closing
the throttle for about 1 minute.
18 Repairing
0458-735-0121-B
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