0458-838-8601-A
2
English 
1 Introduction
Thank you for your purchase. The information contained in 
this manual will help you receive maximum performance and 
satisfaction from your trimmer and, if followed, reduce the 
risk of injury from its use.
The terminology utilized in this manual when referring to the 
power tool reflects the type of cutting attachments that may 
be mounted on it. The term "trimmer" is used to designate an 
FS / FSA unit that is equipped with a nylon line head or a 
head with flexible plastic blades (i.e., the PolyCut head.) The 
term "brushcutter" designates a unit equipped with a rigid 
metal blade. Many STIHL FS / FSA models, including this 
power tool, may be used as either a trimmer or a 
brushcutter. Therefore, the power tool is referred in this 
manual as a "trimmer / brushcutter."
SAVE THIS MANUAL!
Have your authorized STIHL servicing dealer show you how 
to operate your power tool.
Do not lend or rent the power tool without this instruction 
manual. Allow only persons who fully understand the 
information in this manual to operate the trimmer / 
brushcutter.
For further information, or if you do not understand any of 
the instructions in this manual, please go to 
www.stihlusa.com or contact your authorized STIHL 
servicing dealer.
20.3 Sharpening and Balancing a Metal Cutting 
Attachment
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21  Troubleshooting Guide
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21.1 Trimmer / Brushcutter
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21.2 Replacing the Air Filter
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21.3 Cleaning the Spark Plug
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21.4 Adjusting the Throttle Cable
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22  Specifications
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22.1 EPA / CARB
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22.2 STIHL FS 361 C-M, 461 C-M
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22.3 Symbols on the Power Tool and Deflector
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22.4 Engineering Improvements
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23  Approved Deflector, Cutting Attachment and 
Harness Combinations
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23.1 STIHL FS 361 C-M, 461 C-M
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24  Replacement Parts and Equipment
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24.1 Genuine STIHL Replacement Parts
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25  Disposal
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25.1 Disposal of the Power Tool
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26  Limited Warranty
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26.1 STIHL Incorporated Limited Warranty Policy
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27  Emission Control Warranty
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27.1 STIHL Incorporated Federal Emission Control 
Warranty Statement
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27.2 STIHL Incorporated California Exhaust and 
Evaporative Emissions Control Warranty 
Statement
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28  Trademarks
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28.1 Registered Trademarks
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28.2 Common Law Trademarks
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29  Addresses
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29.1 STIHL Incorporated
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1 Introduction
Because a trimmer / brushcutter is a high-speed 
cutting tool, special safety precautions must be 
observed to reduce the risk of personal injury.
Read this instruction manual thoroughly before 
use and periodically thereafter. Follow all safety 
precautions. Careless or improper use can 
cause serious or fatal injury.