Product Instruction Manual
Page 3
...Cable 24 Fitting the Carrying Ring 24 Mounting the Deflector 24 Mounting the Cutting Attachment 25 4-MIX Engine 28 Fuel 29 Fueling 30 Fitting the Harness 31 Balancing the Trimmer/Brushcutter 32 Starting / Stopping the... Maintenance and Care 44 Main Parts 46 Specifications Special Accessories Maintenance and Repairs STIHL Incorporated Federal Emission Control Warranty Statement STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement Trademarks { FS 90, FS 90 R English 48 Allow only persons who fully understand 49 this manual to operate...
...Cable 24 Fitting the Carrying Ring 24 Mounting the Deflector 24 Mounting the Cutting Attachment 25 4-MIX Engine 28 Fuel 29 Fueling 30 Fitting the Harness 31 Balancing the Trimmer/Brushcutter 32 Starting / Stopping the... Maintenance and Care 44 Main Parts 46 Specifications Special Accessories Maintenance and Repairs STIHL Incorporated Federal Emission Control Warranty Statement STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement Trademarks { FS 90, FS 90 R English 48 Allow only persons who fully understand 49 this manual to operate...
Product Instruction Manual
Page 8
... from your clothing. 389BA019 KN 001BA220 KN English It may escape from the fuel system. Warning! Use extreme caution when handling gasoline or fuel mix. In order to reduce the risk of the cap until the leak is fixed and any pressure build-up inside the fuel tank depending on... Toolless cap with the raised positioning 6 FS 90, FS 90 R Grip the shaft in the fuel tank opening . Keep the hot muffler away from the fueling spot before starting the engine. Always shut off any fire or flame near the fuel or the power tool. STIHL recommends that combustible fuel vapor may be ...
... from your clothing. 389BA019 KN 001BA220 KN English It may escape from the fuel system. Warning! Use extreme caution when handling gasoline or fuel mix. In order to reduce the risk of the cap until the leak is fixed and any pressure build-up inside the fuel tank depending on... Toolless cap with the raised positioning 6 FS 90, FS 90 R Grip the shaft in the fuel tank opening . Keep the hot muffler away from the fueling spot before starting the engine. Always shut off any fire or flame near the fuel or the power tool. STIHL recommends that combustible fuel vapor may be ...
Product Instruction Manual
Page 10
...Replace damaged heads or blades before starting instructions, see chart in the chapter on "Approved Combinations of moisture, pitch, oil, fuel mix, grease or resin in that chart, some cutting attachments may require you to maintain a firm grip and properly control your manual....or bystanders. Check that could ignite combustible fumes and cause a fire. A B Arrows on firm ground or 000BA007 KN 000BA006 KN 8 FS 90, FS 90 R Starting Start the engine at all times (see chapters on the spark plug - When viewed from the fueling spot, outdoors only. Place the power tool on ...
...Replace damaged heads or blades before starting instructions, see chart in the chapter on "Approved Combinations of moisture, pitch, oil, fuel mix, grease or resin in that chart, some cutting attachments may require you to maintain a firm grip and properly control your manual....or bystanders. Check that could ignite combustible fumes and cause a fire. A B Arrows on firm ground or 000BA007 KN 000BA006 KN 8 FS 90, FS 90 R Starting Start the engine at all times (see chapters on the spark plug - When viewed from the fueling spot, outdoors only. Place the power tool on ...
Product Instruction Manual
Page 11
... cutting attachment, do not use your unit with both hands on how to have your STIHL dealer check your thumb and forefinger. Do not allow the engine to slow down to engage and move . To reduce the risk of injury from blade or line contact, be fast ...you are in this position to adjust idle speed, see appropriate chapter of moisture, pitch, oil, fuel mix or grease. 002BA054 KN 002BA055 KN FS 90, FS 90 R 9 Important Adjustments Warning! Warning! Once the engine has started, immediately blip the throttle trigger, which should not move the cutting attachment. Do not let the...
... cutting attachment, do not use your unit with both hands on how to have your STIHL dealer check your thumb and forefinger. Do not allow the engine to slow down to engage and move . To reduce the risk of injury from blade or line contact, be fast ...you are in this position to adjust idle speed, see appropriate chapter of moisture, pitch, oil, fuel mix or grease. 002BA054 KN 002BA055 KN FS 90, FS 90 R 9 Important Adjustments Warning! Warning! Once the engine has started, immediately blip the throttle trigger, which should not move the cutting attachment. Do not let the...
Product Instruction Manual
Page 30
... the thrust plate (7). If the mounting nut turns too freely, fit a new one. 28 FS 90, FS 90 R English Removing the metal cutting attachment N Block the drive shaft. Collar (see arrow) must be run on a fuel mixture of gasoline and engine oil. N Take the parts off the shaft - N Block the drive shaft. N Use ...11) on the 4-stroke principle. It operates otherwise on to the output shaft counterclockwise and tighten it down firmly. do not remove the thrust plate (7). 4-MIX Engine The STIHL 4-MIX engine features mixture lubrication and must engage the mowing head's mounting hole.
... the thrust plate (7). If the mounting nut turns too freely, fit a new one. 28 FS 90, FS 90 R English Removing the metal cutting attachment N Block the drive shaft. Collar (see arrow) must be run on a fuel mixture of gasoline and engine oil. N Take the parts off the shaft - N Block the drive shaft. N Use ...11) on the 4-stroke principle. It operates otherwise on to the output shaft counterclockwise and tighten it down firmly. do not remove the thrust plate (7). 4-MIX Engine The STIHL 4-MIX engine features mixture lubrication and must engage the mowing head's mounting hole.
Product Instruction Manual
Page 31
..., do not use only in STIHL engines. Do not use BIA or TCW rated (twostroke water cooled) mix oils or other mix oils that you use in air cooled two-cycle engines. Close the container and shake it may increase engine temperatures. If your power tool...STIHL twostroke engine oil at a mix ratio of 89 (R+M/2) and no more than 10% ethanol content. The container should be cleaned as well. it vigorously by always using fuel with a minimum octane rating of 50:1. When mixing, pour oil into the mixture. When filling at authorized disposal locations. FS 90, FS 90...
..., do not use only in STIHL engines. Do not use BIA or TCW rated (twostroke water cooled) mix oils or other mix oils that you use in air cooled two-cycle engines. Close the container and shake it may increase engine temperatures. If your power tool...STIHL twostroke engine oil at a mix ratio of 89 (R+M/2) and no more than 10% ethanol content. The container should be cleaned as well. it vigorously by always using fuel with a minimum octane rating of 50:1. When mixing, pour oil into the mixture. When filling at authorized disposal locations. FS 90, FS 90...
Product Instruction Manual
Page 41
... ignite combustible fumes and cause a fire. FS 90, FS 90 R 39 Spark Plug Checking the Spark Plug English 249BA063 KN 000BA039 KN 002BA363 KN If engine is down firmly. Unfavorable running conditions (mostly...spark plug boot and ignition wire connector in the boot may result in trouble in fuel mix. - Removing the spark plug N Move the slide control to start or runs poorly at... resistor type spark plugs of fire and burn injury, use only spark plugs authorized by STIHL. Too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions, e.g. Always press...
... ignite combustible fumes and cause a fire. FS 90, FS 90 R 39 Spark Plug Checking the Spark Plug English 249BA063 KN 000BA039 KN 002BA363 KN If engine is down firmly. Unfavorable running conditions (mostly...spark plug boot and ignition wire connector in the boot may result in trouble in fuel mix. - Removing the spark plug N Move the slide control to start or runs poorly at... resistor type spark plugs of fire and burn injury, use only spark plugs authorized by STIHL. Too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions, e.g. Always press...
Product Instruction Manual
Page 53
...or modifications not recommended or approved in this recommendation regarding quality and mixing ratio of the recommended 2-stroke fuel-oil mixture (see also instruction... emission-related warranted parts: - Warranty Work STIHL Incorporated shall remedy warranty defects at an authorized STIHL servicing dealer. Control Linkages - FS 90, FS 90 R 51 The following : N repair or...Line Fittings - Maintenance Requirements The maintenance instructions in writing by STIHL Incorporated, and N replacement of parts and other engine components caused by the failure of a warranted part still ...
...or modifications not recommended or approved in this recommendation regarding quality and mixing ratio of the recommended 2-stroke fuel-oil mixture (see also instruction... emission-related warranted parts: - Warranty Work STIHL Incorporated shall remedy warranty defects at an authorized STIHL servicing dealer. Control Linkages - FS 90, FS 90 R 51 The following : N repair or...Line Fittings - Maintenance Requirements The maintenance instructions in writing by STIHL Incorporated, and N replacement of parts and other engine components caused by the failure of a warranted part still ...