Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2015
0458-709-9621-A. VA0.L15. 
0000006958_003_GB
FSA 90, FSA 90 R
English
37
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This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process 
with electronic systems.
Contents
Dear Customer,
Thank you for choosing a quality 
engineered STIHL product.
It has been built using modern 
production techniques and 
comprehensive quality assurance. 
Every effort has been made to ensure 
your satisfaction and troublefree use of 
the product.
Please contact your dealer or our sales 
company if you have any queries 
concerning this product.
Your
Dr. Nikolas Stihl
Guide to Using this Manual 38
Safety Precautions 38
Reactive Forces 44
Working Techniques 44
Approved Combinations of Cutting 
Attachment, Deflector, Handle and 
Harness 46
Mounting the Bike Handle 47
Mounting the Loop Handle 49
Mounting the Deflector 50
Mounting the Cutting Attachment 51
Connecting Charger to Power 
Supply 54
Charging the Battery 54
LEDs on Battery 55
LED on Charger 57
Fitting the Harness 57
Balancing the Machine 58
Switching On 59
Switching Off 60
Storing the Machine 61
Maintaining the Mowing Head 62
Sharpening Metal Cutting Blades 63
Maintenance and Care 64
Minimize Wear and Avoid Damage 65
Main Parts 66
Specifications 67
Troubleshooting 69
Maintenance and Repairs 71
Disposal 71
EC Declaration of Conformity 71