Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2011
0458-546-8621-C. M13-5.H11.CP.
0000001050_008_GB
FS 40, FS 40 C, FS 50, FS 50 C
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 24
Operating Instructions 26
Cleaning the Air Filter 26
Engine Management 27
Adjusting the Carburetor 27
Spark Plug 28
Engine Running Behavior 29
Rewind Starter 30
Storing the Machine 30
Replacing Nylon Line 30
Inspections and Maintenance by
Dealer 33
Maintenance and Care 34
Main Parts 36
Specifications 37
Special Accessories 38
Maintenance and Repairs 39
STIHL Incorporated Federal
Emission Control Warranty
Statement 39
STIHL Incorporated California
Exhaust and Evaporative
Emissions Control Warranty
Statement 41
Trademarks 43
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.
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