Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2011
0458-232-8621-C. M54.H11.CP. 
0000000052_006_GB
FS 45, FS 46
English
1
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Contents
Allow only persons who fully understand 
this manual to operate your trimmer.
To receive maximum performance and 
satisfaction from your STIHL trimmer, it 
is important that you read, understand 
and follow the safety precautions and 
the operating and maintenance 
instructions in chapter "Safety 
Precautions and Working Techniques" 
before using your trimmer. For further 
information you can go to 
www.stihlusa.com.
Contact your STIHL dealer or the STIHL 
distributor for your area if you do not 
understand any of the instructions in this 
manual.
Make sure your unit is equipped with the 
proper deflector, handle and harness for 
the type of cutting attachment being 
used. Always wear proper eye 
protection.
Guide to Using this Manual 2
Safety Precautions and Working 
Techniques 3
Approved Combinations of Cutting 
Attachment, Deflector, Handle and 
Harness 15
Mounting the Loop Handle 16
Mounting the Deflector 16
Mounting the Cutting Attachment 17
Fuel 20
Fueling 21
Starting / Stopping the Engine 22
Operating Instructions 24
Cleaning the Air Filter 24
Engine Management 25
Adjusting the Carburetor 25
Spark Plug 27
Rewind Starter 28
Storing the Machine 28
Replacing Nylon Line 28
Inspections and Maintenance by 
Dealer 31
Maintenance and Care 32
Main Parts 34
Specifications 35
Special Accessories 36
Maintenance and Repairs 36
STIHL Incorporated Federal 
Emission Control Warranty 
Statement 37
STIHL Incorporated California 
Exhaust and Evaporative 
Emissions Control Warranty 
Statement 39
Trademarks 41
Warning!
Because a trimmer is a high-speed cut-
ting tool some special safety 
precautions must be observed to reduce 
the risk of personal injury. Careless or 
improper use may cause serious or 
even fatal injury.