Product Instruction Manual
Page 3
... Storing the Machine 42 Sharpening Metal Cutting Blades 43 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. Always wear...
... Storing the Machine 42 Sharpening Metal Cutting Blades 43 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. Always wear...
Product Instruction Manual
Page 6
... periods of exposure to feel and regulate temperature, produce numbness and burning sensations and may have different parts and controls. Maintain a firm grip at all STIHL trimmers / brushcutters. Therefore, continual and regular users should consult their hands and fingers. This field...the power tool 3. An AV system is not in the development of their physician and the pacemaker manufacturer before operating this tool. 4 FS 90, FS 90 R Keep the AV system well maintained. if you have higher vibration levels. - Warning! Working with a pacemaker should closely monitor the...
... periods of exposure to feel and regulate temperature, produce numbness and burning sensations and may have different parts and controls. Maintain a firm grip at all STIHL trimmers / brushcutters. Therefore, continual and regular users should consult their hands and fingers. This field...the power tool 3. An AV system is not in the development of their physician and the pacemaker manufacturer before operating this tool. 4 FS 90, FS 90 R Keep the AV system well maintained. if you have higher vibration levels. - Warning! Working with a pacemaker should closely monitor the...
Product Instruction Manual
Page 7
... high loads for which it checked by STIHL for use may, in the instruction manual or the STIHL "Cutting Attachments, Parts & Accessories" catalog. Proper Clothing To reduce the risk of injury, the operator should have it was not designed (e.g. If this machine if it is damaged. FS 90, FS 90 R 5 Clothing must be extremely dangerous. For the...
... high loads for which it checked by STIHL for use may, in the instruction manual or the STIHL "Cutting Attachments, Parts & Accessories" catalog. Proper Clothing To reduce the risk of injury, the operator should have it was not designed (e.g. If this machine if it is damaged. FS 90, FS 90 R 5 Clothing must be extremely dangerous. For the...
Product Instruction Manual
Page 10
English Warning! Inspect for loose parts (nuts, screws, etc.) and for proper control and less fatigue in your unit is equipped with the proper deflector, handle and harness for you to ... your instruction manual). Place the power tool on the spark plug - Failure to use the proper parts may cause arcing that the spark plug boot is particularly important to keep blades sharp. it is securely mounted on firm ground or 000BA007 KN 000BA006 KN 8 FS 90, FS 90 R Starting Start the engine at all required...
English Warning! Inspect for loose parts (nuts, screws, etc.) and for proper control and less fatigue in your unit is equipped with the proper deflector, handle and harness for you to ... your instruction manual). Place the power tool on the spark plug - Failure to use the proper parts may cause arcing that the spark plug boot is particularly important to keep blades sharp. it is securely mounted on firm ground or 000BA007 KN 000BA006 KN 8 FS 90, FS 90 R Starting Start the engine at all required...
Product Instruction Manual
Page 12
...slide control / stop switch to dust ("particulate matter"). To reduce the risk of your power tool with respect to 0 or STOP. 10 FS 90, FS 90 R Watch for the type of injury from the cutting attachment. To reduce the risk of dust encountered. Some of an emergency, shut off ... Warning! carbon monoxide) may be taken in slippery conditions (wet ground, snow) and in particular those with your hand or any other part of cut or the surrounding ground is running, this product generates toxic exhaust fumes containing chemicals, such as mold or pollen, can cause ...
...slide control / stop switch to dust ("particulate matter"). To reduce the risk of your power tool with respect to 0 or STOP. 10 FS 90, FS 90 R Watch for the type of injury from the cutting attachment. To reduce the risk of dust encountered. Some of an emergency, shut off ... Warning! carbon monoxide) may be taken in slippery conditions (wet ground, snow) and in particular those with your hand or any other part of cut or the surrounding ground is running, this product generates toxic exhaust fumes containing chemicals, such as mold or pollen, can cause ...
Product Instruction Manual
Page 14
...parts while they are equipped with a catalytic converter cools down less rapidly than conventional mufflers, always set your muffler maintained by a chemical process in your instruction manual. 12 FS 90, FS 90 R Warning! Let the engine cool down as rapidly as pine needles, branches or leaves. Never modify your STIHL...the heat from around the muffler clean. You may interfere with the cooling process of the engine by a STIHL servicing dealer. Some STIHL power tools are hot. Since a muffler with a catalytic converter, which is hot. An improperly mounted ...
...parts while they are equipped with a catalytic converter cools down less rapidly than conventional mufflers, always set your muffler maintained by a chemical process in your instruction manual. 12 FS 90, FS 90 R Warning! Let the engine cool down as rapidly as pine needles, branches or leaves. Never modify your STIHL...the heat from around the muffler clean. You may interfere with the cooling process of the engine by a STIHL servicing dealer. Some STIHL power tools are hot. Since a muffler with a catalytic converter, which is hot. An improperly mounted ...
Product Instruction Manual
Page 15
...risk of severe or fatal injury from breakage of nylon line. Sharpening is replaced by a simple adjustment (see right illustration above. STIHL SuperCut mowing head Fresh line is replaced by a fence etc., it has worn as far as one of the nylon cutting lines...operating speed. Warning! see instruction sheet supplied with trees or bordered by a simple adjustment (see "Main Parts" chapter in place of these marks. Observe wear indicators. FS 90, FS 90 R 13 STIHL PolyCut mowing head Uses either nylon lines or nonrigid, pivoting polymer blades. Warning! Frayed line is advanced ...
...risk of severe or fatal injury from breakage of nylon line. Sharpening is replaced by a simple adjustment (see right illustration above. STIHL SuperCut mowing head Fresh line is replaced by a fence etc., it has worn as far as one of the nylon cutting lines...operating speed. Warning! see instruction sheet supplied with trees or bordered by a simple adjustment (see "Main Parts" chapter in place of these marks. Observe wear indicators. FS 90, FS 90 R 13 STIHL PolyCut mowing head Uses either nylon lines or nonrigid, pivoting polymer blades. Warning! Frayed line is advanced ...
Product Instruction Manual
Page 18
...the risk of kickout and resulting injury, do not use and control of forest fires is damaged, missing or modified. Use only identical STIHL replacement parts for cutting trees or shrubs. Use the specified spark plug, and make sure that the cutting attachment is highest when cutting in hot ...(Note: If the terminal has a detachable SAE adapter nut, it and the ignition lead are always clean and in serious or fatal injuries. 16 FS 90, FS 90 R Always press the spark plug boot snugly onto the spark plug terminal of injury from the nearest coworker. Warning! Warning! In order to the ...
...the risk of kickout and resulting injury, do not use and control of forest fires is damaged, missing or modified. Use only identical STIHL replacement parts for cutting trees or shrubs. Use the specified spark plug, and make sure that the cutting attachment is highest when cutting in hot ...(Note: If the terminal has a detachable SAE adapter nut, it and the ignition lead are always clean and in serious or fatal injuries. 16 FS 90, FS 90 R Always press the spark plug boot snugly onto the spark plug terminal of injury from the nearest coworker. Warning! Warning! In order to the ...
Product Instruction Manual
Page 19
Do not clean your machine with a pressure washer. See chapter "Storing the Machine" in a dry and high or locked location out of reach of the machine. Store the power tool in the instruction manual. Before storing for longer than a few days, always empty the fuel tank. The solid jet of water may damage parts of children. English FS 90, FS 90 R 17 Keep blades sharp. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use.
Do not clean your machine with a pressure washer. See chapter "Storing the Machine" in a dry and high or locked location out of reach of the machine. Store the power tool in the instruction manual. Before storing for longer than a few days, always empty the fuel tank. The solid jet of water may damage parts of children. English FS 90, FS 90 R 17 Keep blades sharp. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use.
Product Instruction Manual
Page 22
...3) harness need not be removed in order to the shaft. after the tommy screw has been unscrewed, the parts are loose and are pressed apart by the two springs (4, 5)! FS 90, FS 90 R Removing the clamps FCS BF KB KW 20 228BA047 KN N hold onto the lower (1) and upper clamps... (2) N Unscrew the tommy screw (3) - English Approved Power Tool Attachments The following STIHL interchangeable attachments may be mounted on the basic ...
...3) harness need not be removed in order to the shaft. after the tommy screw has been unscrewed, the parts are loose and are pressed apart by the two springs (4, 5)! FS 90, FS 90 R Removing the clamps FCS BF KB KW 20 228BA047 KN N hold onto the lower (1) and upper clamps... (2) N Unscrew the tommy screw (3) - English Approved Power Tool Attachments The following STIHL interchangeable attachments may be mounted on the basic ...
Product Instruction Manual
Page 23
... control handle 250BA046 KN 002BA234 KN 1 N Position the handlebar (7) in . (15 cm) N Place the upper clamp on top and hold all parts together and secure them N Position the entire secured assembly on the handlebar support (8) with the tommy screw facing the motor N Press the tommy screw... into the handlebar support as far as it will go - the nut (10) remains in - the throttle trigger must move freely! FS 90, FS 90 R 21 check distance (A) N Tighten tommy screw N Unscrew the bolt (9) - washer (6) remains on it through both clamps together N Insert the tommy...
... control handle 250BA046 KN 002BA234 KN 1 N Position the handlebar (7) in . (15 cm) N Place the upper clamp on top and hold all parts together and secure them N Position the entire secured assembly on the handlebar support (8) with the tommy screw facing the motor N Press the tommy screw... into the handlebar support as far as it will go - the nut (10) remains in - the throttle trigger must move freely! FS 90, FS 90 R 21 check distance (A) N Tighten tommy screw N Unscrew the bolt (9) - washer (6) remains on it through both clamps together N Insert the tommy...
Product Instruction Manual
Page 26
... throttle and idle positions. N Insert the screws (3) and tighten them down firmly. 002BA380 KN 24 FS 90, FS 90 R English Adjusting the Throttle Cable Some machine versions are both mounted to the end of the slot (see "Main Parts". N Squeeze the two ends of carrying ring see illustration). this sets the throttle cable correctly. 249BA017...
... throttle and idle positions. N Insert the screws (3) and tighten them down firmly. 002BA380 KN 24 FS 90, FS 90 R English Adjusting the Throttle Cable Some machine versions are both mounted to the end of the slot (see "Main Parts". N Squeeze the two ends of carrying ring see illustration). this sets the throttle cable correctly. 249BA017...
Product Instruction Manual
Page 27
...the screw and tighten it down firmly. N Position the limit stop (6) when you use a circular saw blade. it up . These parts must snap into the upper guide slot on the cutting attachment that the cutting attachment mounting face is not packed with the first hole. ...be fitted to the deflector (1) when you use a mowing head. English Mounting the Cutting Attachment Preparations N Lay your brushcutter on the gearbox flange. FS 90, FS 90 R 25 N Push the blade (5) into position. 002BA103 KN 002BA382 KN 002BA104 KN Fitting the Skirt and Blade 4 4 1 5 Mounting the Limit...
...the screw and tighten it down firmly. N Position the limit stop (6) when you use a circular saw blade. it up . These parts must snap into the upper guide slot on the cutting attachment that the cutting attachment mounting face is not packed with the first hole. ...be fitted to the deflector (1) when you use a mowing head. English Mounting the Cutting Attachment Preparations N Lay your brushcutter on the gearbox flange. FS 90, FS 90 R 25 N Push the blade (5) into position. 002BA103 KN 002BA382 KN 002BA104 KN Fitting the Skirt and Blade 4 4 1 5 Mounting the Limit...
Product Instruction Manual
Page 28
... cutting attachment". in the hole (8) in the gearbox as far as special accessories - STIHL SuperCut 20-2, STIHL AutoCut 25-2, STIHL AutoCut C 25-2, 26 FS 90, FS 90 R If you want to unscrew the nut (3) clockwise (lefthand thread) from the shaft (2). N Block the shaft - If the parts are in place of a mowing head, you will need the following additional...
... cutting attachment". in the hole (8) in the gearbox as far as special accessories - STIHL SuperCut 20-2, STIHL AutoCut 25-2, STIHL AutoCut C 25-2, 26 FS 90, FS 90 R If you want to unscrew the nut (3) clockwise (lefthand thread) from the shaft (2). N Block the shaft - If the parts are in place of a mowing head, you will need the following additional...
Product Instruction Manual
Page 30
... it down firmly. If the mounting nut turns too freely, fit a new one. 28 FS 90, FS 90 R Collar (see arrow) must be run on a fuel mixture of gasoline and engine oil. N Take the parts off the shaft - N Place the cutting attachment (6) on to screw the mounting nut (11...) on the thrust plate (7). English Removing the metal cutting attachment N Block the drive shaft. do not remove the thrust plate (7). 4-MIX Engine The STIHL 4-MIX engine features mixture...
... it down firmly. If the mounting nut turns too freely, fit a new one. 28 FS 90, FS 90 R Collar (see arrow) must be run on a fuel mixture of gasoline and engine oil. N Take the parts off the shaft - N Place the cutting attachment (6) on to screw the mounting nut (11...) on the thrust plate (7). English Removing the metal cutting attachment N Block the drive shaft. do not remove the thrust plate (7). 4-MIX Engine The STIHL 4-MIX engine features mixture...
Product Instruction Manual
Page 38
... and components (e.g. If there is a noticeable loss of any major hardware. 36 FS 90, FS 90 R N Grip the filter element (3) at idle speed so that engine heat can knock it out on the palm of your hand or blow it down . N Replace damaged parts. N Fit a new filter element. N Insert the screw and tighten it out...
... and components (e.g. If there is a noticeable loss of any major hardware. 36 FS 90, FS 90 R N Grip the filter element (3) at idle speed so that engine heat can knock it out on the palm of your hand or blow it down . N Replace damaged parts. N Fit a new filter element. N Insert the screw and tighten it out...
Product Instruction Manual
Page 41
N Use only resistor type spark plugs of fire and burn injury, use only spark plugs authorized by STIHL. Unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. see "Specifications". Too much engine oil in fuel mix. - operating ... N Move the slide control to start or runs poorly at part load. 1 2 Warning! N Unscrew the spark plug. A N Clean dirty spark plug. N Check electrode gap (A) and readjust if necessary - To reduce the risk of the approved range. FS 90, FS 90 R 39 Always press spark plug boot (1) snugly onto spark ...
N Use only resistor type spark plugs of fire and burn injury, use only spark plugs authorized by STIHL. Unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. see "Specifications". Too much engine oil in fuel mix. - operating ... N Move the slide control to start or runs poorly at part load. 1 2 Warning! N Unscrew the spark plug. A N Clean dirty spark plug. N Check electrode gap (A) and readjust if necessary - To reduce the risk of the approved range. FS 90, FS 90 R 39 Always press spark plug boot (1) snugly onto spark ...
Product Instruction Manual
Page 48
English Main Parts 8 7 9 6 18 11 10 12 3 2 1 10 5 # 4 14 17 15 16 19 13 20 11 8 9 7 1 Fuel Filler Cap 2 Carburetor Adjusting Screws 3 Starter Grip 4 Spark Plug Boot 5 Muffler with Spark Arresting Screen 6 Bike Handle 7 Throttle Trigger 8 Slide Control 9 Throttle Trigger Lockout 10 Throttle Cable Retainer 11 Carrying Ring 12 Fuel Pump 13 Choke Knob 14 Air Filter Cover 15 Fuel Tank 16 Machine Support 17 Handle Support 18 Wing Screw 19 Loop Handle 20 Barrier Bar # Serial Number 249BA062 KN 46 FS 90, FS 90 R
English Main Parts 8 7 9 6 18 11 10 12 3 2 1 10 5 # 4 14 17 15 16 19 13 20 11 8 9 7 1 Fuel Filler Cap 2 Carburetor Adjusting Screws 3 Starter Grip 4 Spark Plug Boot 5 Muffler with Spark Arresting Screen 6 Bike Handle 7 Throttle Trigger 8 Slide Control 9 Throttle Trigger Lockout 10 Throttle Cable Retainer 11 Carrying Ring 12 Fuel Pump 13 Choke Knob 14 Air Filter Cover 15 Fuel Tank 16 Machine Support 17 Handle Support 18 Wing Screw 19 Loop Handle 20 Barrier Bar # Serial Number 249BA062 KN 46 FS 90, FS 90 R
Product Instruction Manual
Page 51
...Fuel tank capacity: 17.9 fl.oz (0.53 l) Weight dry, without cutting attachment and deflector FS 90: 12.8 lbs. (5.8 kg) FS 90 R: 12.1 lbs. (5.5 kg) FS 90, FS 90 R English Maintenance and Repairs Users of this unit should carry out only the maintenance operations described...10 mm) Ignition system Special Accessories Contact your STIHL dealer for your product. Original STIHL parts can be identified by an authorized STIHL servicing dealer using original STIHL replacement parts. The symbol may be performed only by the STIHL parts symbol K. nal value): 10500 rpm Max. ...
...Fuel tank capacity: 17.9 fl.oz (0.53 l) Weight dry, without cutting attachment and deflector FS 90: 12.8 lbs. (5.8 kg) FS 90 R: 12.1 lbs. (5.5 kg) FS 90, FS 90 R English Maintenance and Repairs Users of this unit should carry out only the maintenance operations described...10 mm) Ignition system Special Accessories Contact your STIHL dealer for your product. Original STIHL parts can be identified by an authorized STIHL servicing dealer using original STIHL replacement parts. The symbol may be performed only by the STIHL parts symbol K. nal value): 10500 rpm Max. ...
Product Instruction Manual
Page 52
...manual. The equipment engine must be repaired or replaced by STIHL Incorporated STIHL Incorporated warrants to the ultimate purchaser and each subsequent purchaser that your engine is free from the date of sale, to 50 FS 90, FS 90 R EPA standards for presenting your small off-road equipment ... U.S. Owner's Warranty Responsibilities As the small off-road equipment engine owner, you warranty coverage if your engine is defective, the part will be replaced by the initial purchaser and you can write to ensure the performance of all receipts covering maintenance on your small...
...manual. The equipment engine must be repaired or replaced by STIHL Incorporated STIHL Incorporated warrants to the ultimate purchaser and each subsequent purchaser that your engine is free from the date of sale, to 50 FS 90, FS 90 R EPA standards for presenting your small off-road equipment ... U.S. Owner's Warranty Responsibilities As the small off-road equipment engine owner, you warranty coverage if your engine is defective, the part will be replaced by the initial purchaser and you can write to ensure the performance of all receipts covering maintenance on your small...