From inside (document excerpt):
STIHL FS 90 Instruction Manual Manual de instrucciones Warning! For safe operation follow all safety precautions in Instruction Manual – improper use can cause serious injury. Advertencia! Para su seguridad durante el manejo de este producto, siga siempre las precauciones de seguridad dadas en el manual de instrucciones – el uso indebido puede causar lesiones graves. English / USA Contents Allow only persons who understand this manual to operate your trimmer/ brushcutter. To receive maximum performance and satisfaction from your STIHL trimmer/ brushcutter, it is important that you read and understand the maintenance and safety precautions, starting on page 3, before using your trimmer/brushcutter.
Contact your STIHL dealer or the STIHL distributor for your area if you do not understand any of the instructions in this manual. Printed on chlorine-free paper. Printing inks contain vegetable oils; paper can be recycled. Guide to Using this Manual 2 Safety Precautions and Working Techniques . 3 Approved Combinations of Cutting Tool, Deflector, Handle and Harness . 20 Approved Power Tool Attachments 22 Mounting the Bike Handle 22 Mounting the Loop Handle . 24 Adjusting the Throttle Cable . 26 Fitting the Carrying Eye 26 Mounting the Deflector . 27 Mounting the Cutting Tools . 28 4-MIX Engine 32 Fuel 32 Fueling 33 Fitting the Harness . 34 Balancing the Brushcutter 35 Starting / Stopping the Engine 36 Cleaning the Air Filter . 39 Motor Management 39 Adjusting the Carburetor 40 Spark Arresting Screen in Muffler 41 Checking the Spark Plug 42 Lubricating the Gearbox . 43 Replacing Starter Rope and Rewind Spring . 43 Storing the Machine . 46 Sharpening Metal Cutting Tools . 47 Inspections and Maintenance by Dealer 47 Maintenance Chart . 48 Parts and Controls . 50 Specifications . 53 Special Accessories . 53 Maintenance and Repairs 54 STIHL Incorporated Federal Emission Control Warranty Statement 55 STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement . 57 Trademarks 59 BA_SE_181_004_01_06.fm !Warning! Because a trimmer/brushcutter is a highspeed cutting 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. 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. STIHL’s philosophy is to continually improve all of its products. As a result, engineering changes and improvements are made from time to time. If the operating characteristics or the appearance of your trimmer/brushcutter differs from those described in this manual, please contact your STIHL dealer for information and assistance. ANDREAS STIHL AG & Co. KG, 2007 0458 260 8621 B. M12. J7. CP. Printed in USA STIHl FS 90, FS 90 R 1 English / USA Guide to Using this Manual Pictograms All the pictograms attached to the machine are shown and explained in this manual. The operating and handling instructions are supported by illustrations. In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols described below: Warning where there is a risk of an accident or personal injury or serious damage to property. Caution where there is a risk of damaging the machine or its individual components. Note or hint which is not essential for using the machine, but may improve the operator’s understanding of the situation and result in better use of the machine. Note or hint on correct procedure in order to avoid damage to the environment. Equipment and features This instruction manual may refer to several models with different features. Components that are not installed on all models and related applications are marked with an asterisk (*). Such components may be available as special accessories from your STIHL dealer. Symbols in text The individual steps or procedures described in the manual may be marked in different ways: : A bullet marks a step or procedure without direct reference to an illustration.