A description of a step or procedure that refers directly to an illustration may contain item numbers that appear in the illustration. Example: N N Loosen the screw (1). Lever (2).
In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols and signal words described below: Danger! Indicates an imminent risk of severe or fatal injury.

BR 500, BR 550, BR 600

English THE OPERATOR Warning! Do not use it for other purposes, since misuse may result in personal injury or property damage, including damage to the machine. Warning! Minors should never be allowed to use this power tool. Bystanders, especially children, and animals should not be allowed in the area where it is in use. Warning! To reduce the risk of injury to bystanders and damage to property, never let your power tool run unattended. When it is not in use (e.g. during a work break), shut it off and make sure that unauthorized persons do not use it. Most of these safety precautions and warnings apply to the use of all STIHL blowers. Different models may have different parts and controls. See the appropriate section of your instruction manual for a description of the controls and the function of the parts of your model. Do not clean your machine with a pressure washer. The solid jet of water may damage parts of the machine. Safe use of a blower involves 1. 2. 3. the operator the power tool the use of the power tool. Physical Condition You must be in good physical condition and mental health and not under the influence of any substance (drugs, alcohol, etc.) which might impair vision, dexterity or judgment. Do not operate this machine when you are fatigued. Warning! Be alert if you get tired, take a break. Tiredness may result in loss of control. Working with any power tool can be strenuous. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating this machine. Warning! Prolonged use of a power tool (or other machines) exposing the operator to vibrations may produce white finger disease (Raynaud's phenomenon) or carpal tunnel syndrome. These conditions reduce the hand's ability to feel and regulate temperature, produce numbness and burning sensations and may cause nerve and circulation damage and tissue necrosis. All factors which contribute to white finger disease are not known, but cold weather, smoking and diseases or physical conditions that affect blood vessels and blood transport, as well as high vibration levels and long periods of exposure to vibration are mentioned as factors in the development of white finger disease. In order to reduce the risk of white finger disease and carpal tunnel syndrome, please note the following: Most STIHL power tools are available with an anti-vibration ("AV") system designed to reduce the transmission of vibrations created by the machine to the operator's hands. An AV system is recommended for those persons using power tools on a regular or sustained basis. Keep your hands warm. Keep the AV system well maintained. A power tool with loose components or with damaged or worn AV elements will tend to have higher vibration levels. Maintain a firm grip at all times, but do not squeeze the handle with constant, excessive pressure. Take frequent breaks.

All the above-mentioned precautions do not guarantee that you will not sustain white finger disease or carpal tunnel syndrome. Therefore, continual and regular users should closely monitor the condition of their hands and fingers. If any of the above symptoms appear, seek medical advice immediately. Warning! The ignition system of the STIHL unit produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce the risk of serious or fatal injury, persons with a pacemaker should consult their physician and the pacemaker manufacturer before operating this tool.
English Proper Clothing Warning! To reduce the risk of injury, the operator should wear proper protective apparel. Warning! To reduce the risk of injury to your eyes never operate your power tool unless wearing goggles or properly fitted protective glasses with adequate top and side protection complying with ANSI Z 87.1 (or your applicable national standard). Power tool noise may damage your hearing. Wear sound barriers (ear plugs or ear mufflers) to protect your hearing. Continual and regular users should have their hearing checked regularly. Be particularly alert and cautious when wearing hearing protection because your ability to hear warnings (shouts, alarms, etc.) is restricted. Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Avoid loose-fitting jackets, scarfs, neckties, jewelry, flared or cuffed pants, unconfined long hair or anything that could become drawn into the air intake. Secure hair so it is above shoulder level. Good footing is very important. Wear sturdy boots with nonslip soles. Steel-toed safety boots are recommended. Warning! To reduce the risk of injury when the inhalation of dust cannot be substantially controlled use an appropriate respirator for the material being blown. For more information see the "Working conditions" section of these Safety Precautions. THE POWER TOOL For illustrations and definitions of the power tool parts see the chapter on "Parts and Controls." Warning! Never modify this power tool in any way. Only attachments supplied by STIHL or expressly approved by STIHL for use with the specific STIHL model are authorized. Although certain unauthorized attachments are useable with STIHL power tools, their use may, in fact, be extremely dangerous. If this tool is subjected to unusually high loads for which it was not designed (e.g. heavy impact or a fall), always check that it is in good condition before continuing work. Check in particular that the fuel system is tight (no leaks) and that the controls and safety devices are working properly. Do not continue operating this machine if it is damaged. In case of doubt, have it checked by your STIHL servicing dealer.
Warning! Small particles (e.g. dust) blown through the blower tubes and nozzle can cause a static charging of the blower tubes. This is especially true in low humidity and high dust conditions. In order to reduce the risk of shock from static charging and subsequent injury from loss of control, your blower has features designed to help reduce the build up of static electricity in the blower tubes and equalize the charge with the engine and/or operator: The control handle is designed to conduct static electricity through the throttle cable to the engine and from the handle through the operator to the ground. STIHL offers an optional kit for use in especially dry and dusty conditions. The kit contains: (1) blower tubes made with graphite to help conduct the charge back to the control handle, and (2) a metal ring with "wire" for insertion in the end tube that helps reduce the buildup of static electricity. If your blower is properly assembled and you are still experiencing static shocks, make sure that your foot ware has conductive soles and try operating your unit without gloves, which may be interfering with the conduction of the charge.

Warning! Breathing asbestos dust is dangerous and can cause severe or fatal injury, respiratory illness or cancer. The use and disposal of asbestos-containing products have been strictly regulated by OSHA and the Environmental Protection Agency. If you have any reason to believe that you might be blowing or otherwise disturbing asbestos, immediately contact your employer or a local OSHA representative. Warning! Dust with silica in its composition may contain crystalline silica. Silica is a basic component of sand, quartz, brick, clay, granite and numerous other minerals and rocks, including masonry and concrete products. Repeated and / or substantial inhalation of airborne crystalline silica can cause serious or fatal respiratory disease, including silicosis. In addition, the state of California and some other authorities have listed respirable crystalline silica as a substance known to cause cancer. When encountering such materials, always follow the respiratory precautions mentioned above. Operating Instructions Warning! In the event of an emergency, switch off the engine immediately move the setting lever to 0 or STOP.
Warning! Even though bystanders should be kept away from the running power tool, never work alone. Keep within calling distance of others in case help is needed. Stop the engine immediately if you are approached. Warning! To reduce the risk of personal injury, do not direct air blast towards bystanders, since the high pressure of the air flow can injure eyes and can blow small objects at great speed. Warning! The blower fan between the air intake and output openings rotates whenever the engine is running. Never insert any foreign object into the air intake of the machine or into the nozzle of the blower. It will damage the fan wheel and may cause serious injury to the operator or bystanders as a result of the object or broken parts being thrown out at high speed. Do not place the blower on the ground when operating at high speed, because small objects such as sand, grass, dust, etc. may be pulled into the air intake and damage the fan wheel. It is best to turn the machine off when putting it on the ground.
Warning! The muffler and other parts of the engine (e.g. fins of the cylinder, spark plug) become hot during operation and remain hot for a while after stopping the engine. To reduce risk of burns do not touch the muffler and other parts while they are hot. Warning! To reduce the risk of fire and burn injury, keep the area around the muffler clean. Remove excess lubricant and all debris such as pine needles, branches or leaves. Let the engine cool down sitting on concrete, metal, bare ground or solid wood (e.g. the trunk of a felled tree) away from any combustible substances. Warning! Never modify your muffler. The muffler could be damaged and cause an increase in heat radiation or sparks, thereby increasing the risk of fire and burn injury. You may also permanently damage the engine. Have your muffler serviced and repaired by your STIHL servicing dealer only. MAINTENANCE, REPAIR AND STORING Maintenance, replacement, or repair of the emission control devices and systems may be performed by any nonroad engine repair establishment or individual. However, if you make a warranty claim for a component which has not been serviced or

English maintained properly or if nonapproved replacement parts were used, STIHL may deny coverage. Warning! Use only identical STIHL replacement parts for maintenance and repair. Use of non-STIHL parts may cause serious or fatal injury. Strictly follow the maintenance and repair instructions in the appropriate section of your instruction manual. Please refer to the maintenance chart in this manual. Warning! Always stop the engine and make sure that the fan is stopped before doing any maintenance or repair work or cleaning the power tool. Do not attempt any maintenance or repair work not described in your instruction manual. Have such work performed by your STIHL servicing dealer only. Warning! Use the specified spark plug and make sure it and the ignition lead are always clean and in good condition. Always press spark plug boot snugly onto spark plug terminal of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be securely attached.) A loose connection between spark plug terminal and the ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire.
Warning! Never test the ignition system with the boot removed from the spark plug or with a removed spark plug, since uncontained sparking may cause a fire. Warning! Do not operate your power tool if the muffler is damaged, missing or modified. An improperly maintained muffler will increase the risk of fire and hearing loss. If your muffler was equipped with a spark-arresting screen to reduce the risk of fire, never operate your power tool if the screen is missing or damaged. Remember that the risk of forest fires is greater in hot or dry weather. Tighten all nuts, bolts and screws except the carburetor adjustment screws after each use. For maintenance items please also refer to the maintenance chart in this manual. Store the power tool in a dry and high or locked location out of reach of children. Before storing for longer than a few days, always empty the fuel tank. See chapter "Storing the machine" in this manual. Store fuel in an approved and properly labeled safety-type canister only. Take care when handling gasoline! For health and safety reasons, avoid direct contact with the skin and avoid inhaling fuel vapor!

Lift the tabs of the sliding adjusters.
Tightening the harness straps N N Set throttle trigger to the full throttle position as far as stop. Carefully screw home the screw in the throttle trigger until you feel initial resistance.

373BA003 KN

Pull the ends of the straps downward.

373BA004 KN

Adjust the throttle cable only when the unit is completely and properly assembled.

4-MIX Engine

The STIHL 4-MIX engine features mixture lubrication and must be run on a fuel mixture of gasoline and engine oil. It operates otherwise on the 4-stroke principle.
This engine is certified to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1. Your engine requires a mixture of highquality gasoline and quality two-stroke air cooled engine oil. Use mid-grade unleaded gasoline with a minimum octane rating of 89 (R+M/2). If the octane rating of the mid-grade gasoline in your area is lower, use premium unleaded fuel. Fuel with a lower octane rating may increase engine temperatures. This, in turn, increases the risk of piston seizure and damage to the engine. The chemical composition of the fuel is also important. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. This could cause running problems or even damage the engine. For this reason STIHL recommends that you use only nationally recognized high-quality unleaded gasoline! Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that are designed for use only in air cooled two-cycle engines. We recommend STIHL 50:1 two-stroke engine oil since it is specially formulated for use in STIHL engines. Do not use BIA or TCW rated (twostroke water cooled) mix oils or other mix oils that state they are for use in both
water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.). Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the canister from your vehicle and place the canister on the ground before filling. Do not fill fuel canisters that are sitting in or on a vehicle. The canister should be kept tightly closed in order to avoid any moisture getting into the mixture. The machines fuel tank and the canister in which fuel mix is stored should be cleaned as necessary. Fuel mix ages Only mix sufficient fuel for a few days work, not to exceed 3 months of storage. Store in approved fuel-canisters only. When mixing, pour oil into the canister first, and then add gasoline. Close the canister and shake it vigorously by hand to ensure proper mixing of the oil with the fuel. Gasoline US gal. 1/Oil (STIHL 50:1 or equivalent high-quality oils) US fl.oz 2.6 6.4 12.8

Dispose of empty mixing-oil canisters only at authorized disposal locations.

Fueling

Opening the cap

Closing the cap

Preparations
Raise the grip until it is upright.
Fit the cap grip upright marks must line up. Turn the cap clockwise as far as stop (approx. a quarter turn).
Before fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank. N N Turn the cap counterclockwise (approx. a quarter turn). Remove the filler cap. N Fueling Take care not to spill fuel while fueling and do not overfill the tank. Fold the grip flush with the top of the cap.
Always thoroughly shake the mixture in the canister before fueling your machine. N Position the machine so that the filler cap is facing up. In order to reduce the risk of burns or other personal injury from escaping gas vapor and fumes, remove the fuel filler cap carefully so as to allow any pressure buildup in the tank to release slowly.
If the grip does not lie completely flush with the cap and the detent on the grip does not engage the recess in the filler neck, the cap is not properly seated and tightened and you must repeat the above steps.

Winter Operation

452BA086 KN
Information Before You Start

452BA020 KN

At temperatures below 50F (+10C): N N N
Swing the shutter (4) to the winter position (r). Tighten down the screw (3) firmly. Refit the filter cover and air filter element. Do not operate your machine at temperatures below 14F (-10C) exposure to low temperatures may damage machine components. 1 2
Setting lever Throttle trigger
The three positions of the setting lever Engine stop 0 ignition interrupted, engine stops. The setting lever does not remain in ths position, it springs back. Normal run position F engine runs or is ready to start. Throttle trigger can be operated normally. Lock position C the throttle trigger can be locked in three positions: 1/3 throttle, 2/3 throttle and full throttle. To disengage the lock, move the setting lever (1) back to the normal run position F.
At temperatures above 70F (+20C): N

452BA084 KN

Always return the shutter (4) to the summer position (s) since there is otherwise a risk of engine running problems due to overheating.

Carefully turn both adjusting screws counterclockwise as far as stop: The high speed screw (H) is 3/4 turn open.

Spark Plug

If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug.

Checking the Spark Plug

000BA039 KN
Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation. Removing the Spark Plug
N N Clean dirty spark plug. Check electrode gap (A) and readjust if necessary see "Specifications".

002BA071 KN

Use only resistor type spark plugs of the approved range. Warning!
Rectify problems which have caused fouling of spark plug: Too much oil in fuel mix. Dirty air filter. Unfavorable running conditions, e.g. operating at part load.
N N Pull off the spark plug boot (1). Unscrew the spark plug (2).
To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot (2) snugly onto spark plug terminal (1) of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be attached.) A loose connection between spark plug boot and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire.

452BA092 KN

English Installing the spark plug
Spark Arresting Screen in Muffler
In some countries the muffler is equipped with a spark arresting screen. N If the engine is down on power, check the spark arresting screen in the muffler. Wait for the muffler to cool down.
Replacing the Starter Rope and Rewind Spring
Replacing the starter rope

002BA178 KN 452BA090 KN

Take out the screws (1). Remove the starter cover (2).
N N Loosen the screws (1). Remove the scoop (2).
Screw the spark plug (3) into the cylinder and fit the boot (2) (press it down firmly).
N N Remove the spark arresting screen (3).

452BA091 KN

Use a screwdriver or suitable pliers to remove the spring clip (3) from the starter post. The rewind spring may pop out and uncoil during this operation take care to avoid the risk of injury.
Clean the spark arresting screen. If the screen is damaged or heavily carbonized, fit a new one. Refit the spark arresting screen. Fit the scoop.

Carefully remove the rope rotor with washer (4) and pawls (5). Use a screwdriver to pry the rope out of the starter grip. Remove the remaining rope from the rotor and starter grip.
English N Slip the rotor over the starter post (8) turn it back and forth to engage the anchor loop of the rewind spring. N N N Pull out and straighten the twisted rope. Let go of the rotor. Release the rope slowly so that it winds onto the rotor.

213BA018 KN

Thread the new rope through the starter grip and tie one of the special knots shown. Pull the knot back into the grip. N N N Refit the pawls (5) in the rotor. Fit the washer (4) on the starter post. Use a screwdriver or suitable pliers to install the spring clip (3) on starter post and engage it on the pawls' peg the spring clip must point counterclockwise as shown in the illustration.
The starter grip must locate firmly in the guide bushing. If the grip droops to one side: Add one more turn on the rope rotor to increase spring tension. When the starter rope is fully extended it must still be possible to rotate the rotor at least another half turn. If this is not the case, the spring is overtensioned and could break. N Take one turn of the rope off the rotor.
Replacing a broken rewind spring The bits of spring may still be under tension and could fly apart when you take them out of the starter cover wear face protection and work gloves. N Remove the rope rotor.
Tensioning the rewind spring
Thread the end of the rope through the top of the guide bushing (6) and rope rotor (7) and secure it with a simple overhand knot. Coat the rope rotor bearing bore with non-resinous oil.
Make a loop in the unwound starter rope and use it to turn the rope rotor six full revolutions in the direction of the arrow. Hold the rotor steady.

Storing the Machine

For periods of 3 months or longer N N N Use a screwdriver to carefully remove the spring housing (1) and the parts of the broken spring. Lubricate the new spring with a few drops of non-resinous oil. Position the replacement spring with spring housing in the starter cover. Fit the rope rotor, tension the rewind spring, fit the starter cover and secure it in position. N Drain and clean the fuel tank in a well ventilated area. Dispose of fuel properly in accordance with local environmental requirements. Run the engine until the carburetor is dry this helps prevent the carburetor diaphragms sticking together. Thoroughly clean the machine pay special attention to the cylinder fins and air filter. Do not store your machine at temperatures below 14F (-10C) exposure to low temperatures may damage machine components. Store the machine in a dry, high or locked location, out of the reach of children and other unauthorized persons.

Specifications

EPA / CEPA The Emission Compliance Period referred to on the Emissions Compliance Label indicates the number of operating hours for which the engine has been shown to meet Federal emission requirements. Category A = 300 hours B = 125 hours C = 50 hours CARB The Emission Compliance Period used on the CARB-Air Index Label indicates the terms: Extended = 300 hours Intermediate = 125 hours Moderate = 50 hours Engine STIHL 4-MIX Engine Displacement: Bore: Stroke: Idle speed: 3.95 cu. in. (64.8 cm)3 2.55 in. (50 mm) 1.3 in. (33 mm) 2,500 rpm
10. Backplate Helps protect the back of the user. 11. Intake Screen Helps prevent leaves entering intake. 12. Air Filter Cover Covers and protects the air filter element. 13. Fuel Filler Cap For closing the fuel tank. BR 500, BR 550, BR 600
English Ignition System Electronic magneto ignition (breakerless) Spark plug (resistor NGK CMR 6 H, type): BOSCH USR 4AC Electrode gap: 0.028 in. (0.7 mm) Fuel System All position diaphragm carburetor with integral fuel pump Fuel tank capacity: 47.3 fl.oz (1.4 l) Blower Data Maximum air flow rate BR 500: 812 cf/min (1380 m3/h) BR 550: 877 cf/min (1490 m3/h) BR 600: 1012 cf/min (1720 m3/h) Maximum air flow rate with nozzle BR 500: 477 cf/min (810 m3/h) BR 550: 530 cf/min (900 m3/h) BR 600: 712 cf/min (1012 m3/h) Air Velocity with Nozzle BR 500: BR 550: BR 600: 181 mph (81 m/s) 199 mph (89 m/s) 201 mph (90 m/s) Weight dry BR 500: BR 550: BR 600:

Special Accessories

22.3 lbs (10.1 kg) 21.8 lbs (9.9 kg) 21.6 lbs (9.8 kg) Contact your STIHL dealer for information regarding special accessories that may be available for your product.

Maintenance and Repairs

Users of this unit should carry out only the maintenance operations described in this manual. Other repair work may be performed only by authorized STIHL service shops. Warranty claims following repairs can be accepted only if the repair has been performed by an authorized STIHL servicing dealer using original STIHL replacement parts. Original STIHL parts can be identified by the STIHL part number, the { logo and, in some cases, by the STIHL parts symbol K. The symbol may appear alone on small parts.
STIHL Incorporated Federal Emission Control Warranty Statement
Not for California Your Warranty Rights and Obligations The U.S. Environmental Protection Agency (EPA) and STIHL Incorporated are pleased to explain the Emission Control System Warranty on your equipment type engine. In the U.S. new 1997 and later model year small off-road equipment engines must be designed, built and equipped, at the time of sale, to meet the U.S. EPA regulations for small non road engines. The equipment engine must be free from defects in materials and workmanship which cause it to fail to conform with U.S. EPA standards for the first two years of engine use from the date of sale to the ultimate purchaser. STIHL Incorporated must warrant the emission control system on your small off-road engine for the period of time listed below provided there has been no abuse, neglect or improper maintenance of your small off-road equipment engine. Your emission control system includes parts such as the carburetor and the ignition system. Also included may be hoses, and connectors and other emission-related assemblies. Where a warrantable condition exists, STIHL Incorporated will repair your small off-road equipment engine at no

Where to make a Claim for Warranty Service Bring the product to any authorized STIHL servicing dealer and present the signed warranty card. Maintenance Requirements The maintenance instructions in this manual are based on the application of the recommended 2-stroke fuel-oil mixture (see also instruction "Fuel"). Deviations from this recommendation regarding quality and mixing ratio of fuel and oil may require shorter maintenance intervals. Limitations This Emission Control Systems Warranty shall not cover any of the following: N repair or replacement required because of misuse, neglect or lack of required maintenance, repairs improperly performed or replacements not conforming to STIHL Incorporated specifications that adversely affect performance and/or durability, and alterations or BR 500, BR 550, BR 600
English modifications not recommended or approved in writing by STIHL Incorporated, and N replacement of parts and other services and adjustments necessary for required maintenance at and after the first scheduled replacement point.
STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement
For California only Your Warranty Rights and Obligations The California Air Resources Board (CARB) and STIHL Incorporated are pleased to explain the Emission Control System Warranty on your 2007 and later small off-road equipment engine. In California, new equipment that uses small off-road engines must be designed, built, and equipped to meet the State's stringent anti-smog standards. STIHL Incorporated must warrant the emissions control system on your small off-road engine for the period listed below provided there has been no abuse, neglect or improper maintenance of your small off-road engine. Your emissions control system may include parts such as: Air Filter, Carburetor, Purger, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition Module), Spark Plug, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line, Fuel Line Fittings, Clamps, Fasteners.
Where a warrantable condition exists, STIHL Incorporated will repair your small off-road equipment engine at no cost to you including diagnosis, parts and labor. Manufacturers Warranty Responsibilities This emissions control system is warranted for two years in California. If any emissions-related part on your equipment is defective, the part will be repaired or replaced by STIHL Incorporated free of charge. Owners Warranty Responsibilities As the small off-road equipment engine owner, you are responsible for performance of the required maintenance listed in your instruction manual. STIHL Incorporated recommends that you retain all receipts covering maintenance on your small offroad equipment engine, but STIHL Incorporated cannot deny warranty solely for the lack of receipts or your failure to ensure the performance of all scheduled maintenance. As the small off-road equipment engine owner, you should however be aware that STIHL Incorporated may deny you warranty coverage if your small off-road equipment engine or a part has failed due to abuse, neglect, or improper maintenance or unapproved modifications. You are responsible for presenting your small off-road equipment engine to a STIHL servicing dealer as soon as the problem exists. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days. If 31

English you have any questions regarding your warranty rights and responsibilities, please contact a STIHL customer service representative at 1-800-4678445 or you can write to STIHL Inc., 536 Viking Drive, P.O. Box 2015, Virginia Beach, VA 23450-2015. Coverage by STIHL Incorporated STIHL Incorporated warrants to the ultimate purchaser and each subsequent purchaser that your small off-road equipment engine is designed, built and equipped, at the time of sale, to meet all applicable emission regulations. STIHL Incorporated also warrants to the initial purchaser and each subsequent purchaser that your engine is free from defects in materials and workmanship which cause the engine to fail to conform to applicable emission regulations for a period of two years. Defects Warranty Period The warranty periods will begin on the date the utility equipment engine is purchased by the initial purchaser. If any emission-related part on your engine is defective, the part will be replaced by STIHL Incorporated at no cost to the owner. Add-on or modified parts that are not exempted by CARB may not be used. The use of any non exempted add-on or modified parts will be grounds for disallowing a warranty claim. STIHL Incorporated will not be liable to warrant failures of warranted parts caused by the use of a non exempted add-on or modified part. 32 3. The warranty on emissions-related parts will be interpreted as follows: 1. Any warranted part that is not scheduled for replacement as required maintenance in the written instructions required in the Emission Warranty Parts List (see below) must be warranted for the warranty period defined in Subsection COVERAGE BY STIHL INCORPORATED, see above. If any such part fails during the period of warranty coverage, it must be repaired or replaced by the manufacturer according to Subsection (4) below. Any such part repaired or replaced under the warranty must be warranted for the remaining warranty period. Any warranted part that is scheduled only for regular inspection in the written instructions required by the Emission Warranty Parts List (see below) must be warranted for the warranty period defined in Subsection COVERAGE BY STIHL INCORPORATED, see above. A statement in such written instructions to the effect of "repair or replace as necessary" will not reduce the period of warranty coverage. Any such part repaired or replaced under warranty must be warranted for the remaining warranty period. Any warranted part that is scheduled for replacement as required maintenance in the written instructions required by the Emission Warranty Parts List (see below) must be warranted for the period of time prior to the first scheduled replacement point for that part. If the part fails prior to the first scheduled replacement, the part must be repaired or replaced by the engine manufacturer according to Subsection (4) below. Any such part repaired or replaced under warranty must be warranted for the remainder of the period prior to the first scheduled replacement point for the part. 4. Repair or replacement of any warranted part under the warranty must be performed at a warranty station at no charge to the owner. Notwithstanding the provisions of Subsection (4) above, warranty services or repairs will be provided at all manufacturer distribution centers that are authorized to service the subject engines. The owner must not be charged for diagnostic labor that leads to the determination that a warranted part is in fact defective, provided that such diagnostic work is performed at a warranty station.

Warranty Work STIHL Incorporated shall remedy warranty defects at any authorized STIHL servicing dealer or warranty station. Any such work shall be free of charge to the owner if it is determined that a warranted part is defective. Any manufacturer approved or equivalent replacement part may be used for any warranty maintenance or repairs on emission-related parts and must be provided without charge to the owner. STIHL Incorporated is liable for
English damages to other engine components caused by the failure of a warranted part still under warranty. Emission Warranty Parts List Air Filter, Carburetor, Purger, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition Module), Spark Plug, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line, Fuel Line Fittings, Clamps, Fasteners Where to make a Claim for Warranty Service Bring the STIHL product to any authorized STIHL servicing dealer and present the signed STIHL product registration card, or the print-out of the electronic product registration. Limitations The repair or replacement of any warranted part otherwise eligible for warranty coverage may be excluded from such warranty coverage if STIHL Incorporated demonstrates that the STIHL product has been abused, neglected, or improperly maintained, and that such abuse, neglect, or improper maintenance was the direct cause of the need for repair or replacement of the part. That notwithstanding, any adjustment of a component that has a factory installed, and properly operating, adjustment limiting device is still eligible for warranty coverage.

Trademarks

STIHL Registered Trademarks STIHL { K The color combination orange-grey (U.S. Registrations #2,821,860; #3,010,057, #3,010,058, #3,400,477; and #3,400,476)
BioPlus Easy2Start EasySpool ElastoStart Ematic / Stihl-E-Matic FixCut HT Plus IntelliCarb Master Control Lever Micro Pro Mark Quad Power Quiet Line
4-MIX AUTOCUT EASYSTART FARM BOSS OILOMATIC STIHL Cutquik STIHL DUROMATIC STIHL Quickstop STIHL ROLLOMATIC STIHL WOOD BOSS TIMBERSPORTS YARD BOSS Some of STIHLs Common Law Trademarks
STIHL Arctic STIHL Compact STIHL HomeScaper Series STIHL Interchangeable Attachment Series STIHL Magnum / Stihl-Magnum STIHL MiniBoss STIHL MotoPlus 4 STIHL Multi-Cut HomeScaper Series Stihl Outfitters STIHL PICCO STIHL PolyCut STIHL PowerSweep STIHL Precision Series STIHL Protech STIHL RAPID STIHL SuperCut

Air intake summer mode

Press to operate manual fuel pump
Symbols in Text Many operating and safety instructions are supported by illustrations. The individual steps or procedures described in the manual may be marked in different ways: N A bullet marks a step or procedure. A description of a step or procedure that refers directly to an illustration may contain item numbers that appear in the illustration. Example: 2

BR 500, BR 550, BR 600

English THE OPERATOR Warning! Do not use it for other purposes, since misuse may result in personal injury or property damage, including damage to the machine. Warning! Minors should never be allowed to use this power tool. Bystanders, especially children, and animals should not be allowed in the area where it is in use. Warning! To reduce the risk of injury to bystanders and damage to property, never let your power tool run unattended. When it is not in use (e.g. during a work break), shut it off and make sure that unauthorized persons do not use it. Most of these safety precautions and warnings apply to the use of all STIHL blowers. Different models may have different parts and controls. See the appropriate section of your instruction manual for a description of the controls and the function of the parts of your model. Do not clean your machine with a pressure washer. The solid jet of water may damage parts of the machine. Safe use of a blower involves 1. 2. 3. the operator the power tool the use of the power tool. Physical Condition You must be in good physical condition and mental health and not under the influence of any substance (drugs, alcohol, etc.) which might impair vision, dexterity or judgment. Do not operate this machine when you are fatigued. Warning! Be alert if you get tired, take a break. Tiredness may result in loss of control. Working with any power tool can be strenuous. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating this machine. Warning! Prolonged use of a power tool (or other machines) exposing the operator to vibrations may produce white finger disease (Raynaud's phenomenon) or carpal tunnel syndrome. These conditions reduce the hand's ability to feel and regulate temperature, produce numbness and burning sensations and may cause nerve and circulation damage and tissue necrosis. All factors which contribute to white finger disease are not known, but cold weather, smoking and diseases or physical conditions that affect blood vessels and blood transport, as well as high vibration levels and long periods of exposure to vibration are mentioned as factors in the development of white finger disease. In order to reduce the risk of white finger disease and carpal tunnel syndrome, please note the following: Most STIHL power tools are available with an anti-vibration ("AV") system designed to reduce the transmission of vibrations created by the machine to the operator's hands. An AV system is recommended for those persons using power tools on a regular or sustained basis. Keep your hands warm. Keep the AV system well maintained. A power tool with loose components or with damaged or worn AV elements will tend to have higher vibration levels. Maintain a firm grip at all times, but do not squeeze the handle with constant, excessive pressure. Take frequent breaks.

All the above-mentioned precautions do not guarantee that you will not sustain white finger disease or carpal tunnel syndrome. Therefore, continual and regular users should closely monitor the condition of their hands and fingers. If any of the above symptoms appear, seek medical advice immediately. Warning! The ignition system of the STIHL unit produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce the risk of serious or fatal injury, persons with a pacemaker should consult their physician and the pacemaker manufacturer before operating this tool.
English Proper Clothing Warning! To reduce the risk of injury, the operator should wear proper protective apparel. Warning! To reduce the risk of injury to your eyes never operate your power tool unless wearing goggles or properly fitted protective glasses with adequate top and side protection complying with ANSI Z 87.1 (or your applicable national standard). Power tool noise may damage your hearing. Wear sound barriers (ear plugs or ear mufflers) to protect your hearing. Continual and regular users should have their hearing checked regularly. Be particularly alert and cautious when wearing hearing protection because your ability to hear warnings (shouts, alarms, etc.) is restricted. Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Avoid loose-fitting jackets, scarfs, neckties, jewelry, flared or cuffed pants, unconfined long hair or anything that could become drawn into the air intake. Secure hair so it is above shoulder level. Good footing is very important. Wear sturdy boots with nonslip soles. Steel-toed safety boots are recommended. Warning! To reduce the risk of injury when the inhalation of dust cannot be substantially controlled use an appropriate respirator for the material being blown. For more information see the "Working conditions" section of these Safety Precautions. THE POWER TOOL For illustrations and definitions of the power tool parts see the chapter on "Parts and Controls." Warning! Never modify this power tool in any way. Only attachments supplied by STIHL or expressly approved by STIHL for use with the specific STIHL model are authorized. Although certain unauthorized attachments are useable with STIHL power tools, their use may, in fact, be extremely dangerous. If this tool is subjected to unusually high loads for which it was not designed (e.g. heavy impact or a fall), always check that it is in good condition before continuing work. Check in particular that the fuel system is tight (no leaks) and that the controls and safety devices are working properly. Do not continue operating this machine if it is damaged. In case of doubt, have it checked by your STIHL servicing dealer.
Warning! Small particles (e.g. dust) blown through the blower tubes and nozzle can cause a static charging of the blower tubes. This is especially true in low humidity and high dust conditions. In order to reduce the risk of shock from static charging and subsequent injury from loss of control, your blower has features designed to help reduce the build up of static electricity in the blower tubes and equalize the charge with the engine and/or operator: The control handle is designed to conduct static electricity through the throttle cable to the engine and from the handle through the operator to the ground. STIHL offers an optional kit for use in especially dry and dusty conditions. The kit contains: (1) blower tubes made with graphite to help conduct the charge back to the control handle, and (2) a metal ring with "wire" for insertion in the end tube that helps reduce the buildup of static electricity. If your blower is properly assembled and you are still experiencing static shocks, make sure that your foot ware has conductive soles and try operating your unit without gloves, which may be interfering with the conduction of the charge.

English THE USE OF THE POWER TOOL Warning! Transporting the Power Tool Warning! Always switch off the engine before taking the machine off your back and putting it down. When transporting it in a vehicle, properly secure it to prevent turnover, fuel spillage and damage to the unit. Fuel Your STIHL power tool uses an oilgasoline mixture for fuel (see the chapter on "Fuel of your instruction manual). Warning! Gasoline is an extremely flammable fuel. If spilled and ignited by a spark or other ignition source, it can cause fire and serious burn injury or property damage. Use extreme caution when handling gasoline or fuel mix. Do not smoke or bring any fire or flame near the fuel or the power tool. Note that combustible fuel vapor may escape from the fuel system. Fueling Instructions Warning! To reduce the risk of serious injury from burns, never attempt to refuel the unit until it has been completely removed from the operator. Fuel your power tool in well-ventilated areas, outdoors. Always shut off the engine and allow it to cool before refueling. Gasoline vapor pressure may build up inside the fuel tank depending on the fuel used, the weather conditions and the tank venting system. In order to reduce the risk of burns and other personal injury from escaping gas vapor and fumes, remove the fuel filler cap on your power tool carefully so as to allow any pressure build-up in the tank to release slowly. Never remove the fuel filler cap while the engine is running. Select bare ground for fueling and move at least 10 feet (3 m) from the fueling spot before starting the engine. Wipe off any spilled fuel before starting your machine. Warning! Check for fuel leakage while refueling and during operation. If fuel leakage is found, do not start or run the engine until the leak is fixed and any spilled fuel has been wiped away. Take care not to get fuel on your clothing. If this happens, change your clothing immediately. Warning! In order to reduce the risk of fuel spillage and fire from an improperly tightened fuel cap, correctly position and tighten the fuel cap in the fuel tank opening. N
To do this with this STIHL cap, raise the grip on the top of the cap until it is upright at a 90 angle. Insert the cap in the fuel tank opening with the raised positioning marks on the grip of the cap and on the fuel tank opening lining up (see illustration). Using the grip, press the cap down firmly while turning it clockwise as far as it will go (approx. a quarter turn). Fold the grip flush with the top of the cap. Grip the cap and check for tightness. If the grip does not lie completely flush with the cap and the detent on the grip does not fit in the corresponding recess in the filler opening, or if the cap is loose in the filler opening, the cap is not properly seated and tightened and you must repeat the above steps. Misaligned, damaged or broken cap If the cap does not drop fully into the opening when the positioning marks line up and/or if the cap does not tighten properly when twisted, the base of the cap in relation to the top may be prematurely rotated to the closed position. Such misalignment 5

The blower is designed for singlehanded operation with the right hand on the control handle. It should be carried as a backpack with the straps of the harness over both shoulders. Warning! To reduce the risk of loss of control, never carry the unit with the strap(s) over one shoulder. Wrap your fingers tightly around the handle, keeping the control handle cradled between your thumb and forefinger. Keep your hand in this position to have your machine under control at all times. Warning! Special care must be taken in slippery conditions (wet ground) and in difficult, overgrown terrain. Watch for hidden obstacles such as tree stumps, roots, rocks, holes and ditches to avoid stumbling. For better footing, clear away fallen branches, scrub and cuttings. Be extremely cautious when working on slopes or uneven ground.
Warning! Inhalation of certain dusts, especially organic dusts such as mold or pollen, can cause susceptible persons to have an allergic or asthmatic reaction. Substantial or repeated inhalation of dust and other airborne contaminants, in particular those with a smaller particle size, may cause respiratory or other illnesses. This includes wood dust, especially from hardwoods, but also from some softwoods such as Western Red Cedar. Control dust at the source where possible. Use good work practices, such as operating the unit so that the wind or operating process directs any dust raised by the power tool away from the operator. Follow the recommendations of EPA/OSHA/NIOSH and occupational and trade associations with respect to dust ("particulate matter"). When the inhalation of dust cannot be substantially controlled, i.e., kept at or near the ambient (background) level, the operator and any bystanders should wear a respirator approved by NIOSH/MSHA for the type of dust encountered. Warning! If the substance being blown is a commercial substance, review the material safety data sheet for that substance and / or consult the material manufacturer / supplier. The state of California and some other authorities, for instance, have published lists of substances known to cause cancer, reproductive toxicity, etc.
Warning! Breathing asbestos dust is dangerous and can cause severe or fatal injury, respiratory illness or cancer. The use and disposal of asbestos-containing products have been strictly regulated by OSHA and the Environmental Protection Agency. If you have any reason to believe that you might be blowing or otherwise disturbing asbestos, immediately contact your employer or a local OSHA representative. Warning! Dust with silica in its composition may contain crystalline silica. Silica is a basic component of sand, quartz, brick, clay, granite and numerous other minerals and rocks, including masonry and concrete products. Repeated and / or substantial inhalation of airborne crystalline silica can cause serious or fatal respiratory disease, including silicosis. In addition, the state of California and some other authorities have listed respirable crystalline silica as a substance known to cause cancer. When encountering such materials, always follow the respiratory precautions mentioned above. Operating Instructions Warning! In the event of an emergency, switch off the engine immediately move the setting lever to 0 or STOP.

Warning! Use the specified spark plug and make sure it and the ignition lead are always clean and in good condition. Always press spark plug boot snugly onto spark plug terminal of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be securely attached.) A loose connection between spark plug terminal and the ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire. Warning! Never test the ignition system with the boot removed from the spark plug or with a removed spark plug, since uncontained sparking may cause a fire. Warning! Do not operate your power tool if the muffler is damaged, missing or modified. An improperly maintained muffler will increase the risk of fire and hearing loss. If your muffler was equipped with a spark-arresting screen to reduce the risk of fire, never operate your power tool if the screen is missing or damaged. Remember that the risk of forest fires is greater in hot or dry weather. Tighten all nuts, bolts and screws except the carburetor adjustment screws after each use. For maintenance items please also refer to the maintenance chart in this instruction manual. Store the power tool in a dry and high or locked location out of reach of children. 9
English Before storing for longer than a few days, always empty the fuel tank. See chapter "Storing the machine" in this instruction manual. Store fuel in an approved and properly labeled safety-type canister only. Take care when handling gasoline! For health and safety reasons, avoid direct contact with the skin and avoid inhaling fuel vapor!

Assembling the Unit

Mounting the Control Handle
Mounting the Blower Tubes BR 500

452BA095 KN

452BA101 KN
Pull the two halves of the clamp apart. Push the control handle (1) onto the blower tube (2). N
Depending on your size and reach: Push blower tube (1) up to the appropriate mark on the blower tube (2). Rotate the blower tube (1) in the direction of the arrow and engage it in the appropriate slot (3).

BR 550, BR 600

Line up the control handle (1) with the tube's seam as shown. Secure the control handle (1) with the screw (3) so that it can still be moved on the blower tube (2). N

452BA096 KN

452BA102 KN
English Mounting the Hose Clamps and Pleated Hose Mounting the nozzle

We recommend STIHL HP Ultra 2-Cycle Engine Oil since it is specially formulated for use in STIHL engines. Do not use BIA or TCW rated (twostroke water cooled) mix oils or other mix oils that state they are for use in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.). Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the canister from your vehicle and place the canister on the ground before filling. Do not fill fuel canisters that are sitting in or on a vehicle. The canister should be kept tightly closed in order to avoid any moisture getting into the mixture. The machines fuel tank and the canister in which fuel mix is stored should be cleaned as necessary. Fuel mix ages Only mix sufficient fuel for a few days work, not to exceed 3 months of storage. Store in approved fuel-canisters only. When mixing, pour oil into the canister first, and then add gasoline. Close the canister and shake it vigorously by hand to ensure proper mixing of the oil with the fuel.
English Gasoline US gal. 1/Oil (STIHL 50:1 or equivalent high-quality oils) US fl.oz 2.6 6.4 12.8

Fueling

Opening
Dispose of empty mixing-oil canisters only at authorized disposal locations. N Raise the grip into an upright position.
Always thoroughly shake the mixture in the canister before fueling your machine. In order to reduce the risk of burns or other personal injury from escaping gas vapor and fumes, remove the fuel filler cap carefully so as to allow any pressure buildup in the tank to release slowly.
Turn the cap counterclockwise (approx. 1/4 turn).

Remove fuel filler cap.

Refueling Take care not to spill fuel while fueling, and do not overfill the tank.

001BA224 KN

001BA219 KN
Before fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank.

001BA218 KN

Preparations
English Closing Checking for proper closure

Winter Operation

With grip in an upright position: N Insert the cap the raised positioning marks on the cap and the fuel tank opening must line up. The cap should drop fully into the opening in this position. Make sure tank is not overfilled.
The lug on the grip must engage entirely in the recess (arrow), and the grip must lie completely flush with the top of the cap.

452BA119 KN

At temperatures below 50F (+10C):

452BA117 KN

While pressing the cap down firmly, twist it clockwise as far as it will go (approx. 1/4 turn).
If the cap can be moved, it is not properly installed. If the cap does not tighten properly, the cap parts may be misaligned with each other, or the cap may be damaged or broken. See the "Fueling Instructions" section of the Safety Precautions for how to correct a misaligned cap and additional information. Never use your machine with a misaligned, damaged or broken cap.
Remove the filter cover (1) and air filter element (2).

452BA085 KN

452BA118 KN

Loosen the screw (3).

Fold down the grip. BR 500, BR 550, BR 600

452BA084 KN

Grip the cap and check for tightness.

452BA120 KN

Information Before You Start

452BA086 KN

Starting / Stopping the Engine

Starting the engine

452BA020 KN
Observe safety precautions. Start your unit on a clean, dustfree surface only to ensure that no dust is sucked in.
Swing the shutter (4) to the winter position (r). Tighten down the screw (3) firmly. Refit the filter cover and air filter element. Do not operate your machine at temperatures below 14F (-10C) exposure to low temperatures may damage machine components. 1 2
Setting lever Throttle trigger
The three positions of the setting lever Engine stop 0 ignition interrupted, engine stops. The setting lever does not remain in ths position, it springs back. Normal run position F engine runs or is ready to start. Throttle trigger can be operated normally. Lock position C the throttle trigger can be locked in three positions: 1/3 throttle, 2/3 throttle and full throttle. To disengage the lock, move the setting lever (1) back to the normal run position F.

452BA105 KN

Erratic idling behavior
These machines have been set at the factory to provide an optimum fuel-air mixture in all locations and operating conditions. Adjusting idle speed Engine stops while idling: N Turn the idle speed screw (LA) slowly clockwise until the engine runs smoothly. N N N N
Idle setting is too rich N Turn the low speed screw (L) clockwise, no further than stop, until the engine runs and accelerates smoothly.
Carefully turn both adjusting screws counterclockwise as far as stop: The high speed screw (H) is 3/4 turn open. The low speed screw (H) is 3/4 turn open. Start and warm up the engine.
It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L). Fine Tuning for Operation in Mountains or at Sea Level A slight correction of the setting may be necessary if engine power is not satisfactory when operating at high altitude or at sea level. N N Check the standard setting. Warm up the engine.
Machines with adjustable carburetor The carburetor comes from the factory with a standard setting. This setting provides an optimum fuel-air mixture under most operating conditions.
English At high altitude N Turn high speed screw (H) clockwise (leaner) no further than stop. If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating. At sea level N Turn high speed screw (H) counterclockwise (richer) no further than stop.

Spark Plug

If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug.

Checking the Spark Plug

Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation. Removing the Spark Plug
N N Clean dirty spark plug. Check electrode gap (A) and readjust if necessary see "Specifications".
Use only resistor type spark plugs of the approved range.
Rectify problems which have caused fouling of spark plug: Too much oil in fuel mix. Dirty air filter. Unfavorable running conditions, e.g. operating at part load.
N N Pull off the spark plug boot (1). Unscrew the spark plug (2).

452BA092 KN

000BA039 KN
Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded.
English Installing the spark plug
Spark Arresting Screen in Muffler
In some countries the muffler is equipped with a spark arresting screen. N If the engine is down on power, check the spark arresting screen in the muffler. Wait for the muffler to cool down.

002BA363 KN

002BA178 KN
N N Loosen the screws (1). Remove the scoop (2).
Warning! To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot (1) snugly onto spark plug terminal (2) of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be attached.) A loose connection between spark plug boot and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire. N

Replacing a broken rewind spring The bits of spring may still be under tension and could fly apart when you take them out of the starter cover wear face protection and work gloves. N Remove the rope rotor.
Tensioning the rewind spring
Make a loop in the unwound starter rope and use it to turn the rope rotor six full revolutions in the direction of the arrow. Hold the rotor steady. Pull out and straighten the twisted rope. N N Use a screwdriver to carefully remove the spring housing (1) and the parts of the broken spring. Lubricate the new spring with a few drops of non-resinous oil.

Storing the Machine

For periods of 3 months or longer N N Drain and clean the fuel tank in a well ventilated area. Dispose of fuel properly in accordance with local environmental requirements. Run the engine until the carburetor is dry this helps prevent the carburetor diaphragms sticking together. Thoroughly clean the machine pay special attention to the cylinder fins and air filter. Do not store your machine at temperatures below 14F (-10C) exposure to low temperatures may damage machine components. Store the machine in a dry, high or locked location, out of the reach of children and other unauthorized persons.
Inspections and Maintenance by Dealer
Fuel pickup body in tank N Have the pickup body in the fuel tank replaced every year.
STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.

Maintenance and Care

after finishing work or daily The following intervals apply to normal operating conditions only. If your daily working time is longer or operating conditions are difficult (very dusty work area, etc.), shorten the specified intervals accordingly. before starting work
after each refueling stop

every 12 months

if damaged
Complete machine Control handle Air filter
Visual inspection (condition, leaks) Clean Check operation Clean Replace Have checked by dealer1) Have filter replaced by dealer1) Clean Check idle adjustment Readjust idle Readjust electrode gap Replace after every 100 operating hours Visual inspection Clean Check and adjust if necessary after 139 hours of operation Decoke after first 139 hours of operating, then every 150 hours Check Clean or replace

X X X X X X X

Filter in fuel tank Fuel tank Carburetor

Spark plug

Cooling inlets Valve clearance Combustion chamber Sparl arresting screen2) in muffler

X X X X X X X X X X

All accessible screws and nuts (not adjustRetighten ing screws) Antivibration elements Check Have replaced by dealer1)

if required

if problem

monthly

weekly
Blower air intake screen Throttle cable Safety labels
Check Clean Adjust Replace

X X X X

STIHL recommends a STIHL servicing dealer. not in all versions, market-specific

Main Parts

# Straight Nozzle Blower Tube (BR 550 / 600) Blower Tube (BR 500) Blower Tube (BR 500 / 550 / 600) Control Handle Throttle Trigger Setting Lever Pleated Hose Harness Backplate Intake Screen Air Filter Cover Fuel Filler Cap Spark Plug Boot Muffler (with Spark Arresting Screen) Carburetor Adjusting Screws Choke Knob Fuel Pump Starter Grip Fuel Tank Serial Number

452BA099 KN

English Definitions 1. 2. 3. 4. 5. Straight Nozzle Aims and widens the airstream. Blower Tube (BR 550 / 600) Directs the airstream. Blower Tube (BR 500) Directs the airstream. Blower Tube (BR 500 / 550 / 600) Directs the airstream. Control Handle Handle on the flexible hose to hold and direct the tube in the required direction. Designed to help protect against static electricity. Throttle Trigger Controls the speed of the engine. Setting Lever For run and stop. Sets the throttle to various positions or stops the engine. Pleated Hose For blowing in the desired direction. Harness For carrying the unit. 14. Spark Plug Boot Connects the spark plug with the ignition lead. 15. Muffler (with Spark Arresting Screen) Muffler reduces exhaust noises and diverts exhaust gases away from operator. Spark arresting screen is designed to reduce the risk of fire. 16. Carburetor Adjusting Screws For tuning the carburetor. 17. Choke Knob Eases engine starting by enriching mixture. 18. Fuel Pump Provides additional fuel feed for a cold start. 19. Starter Grip The grip of the pull starter, for starting the engine. 20. Fuel Tank For fuel and oil mixture.

Specifications

EPA / CEPA The Emission Compliance Period referred to on the Emissions Compliance Label indicates the number of operating hours for which the engine has been shown to meet Federal emission requirements. Category A = 300 hours B = 125 hours C = 50 hours CARB The Emission Compliance Period used on the CARB-Air Index Label indicates the terms: Extended = 300 hours Intermediate = 125 hours Moderate = 50 hours Engine STIHL 4-MIX Engine Displacement: Bore: Stroke: Idle speed: 3.95 cu. in. (64.8 cm)3 2.55 in. (50 mm) 1.3 in. (33 mm) 2,500 rpm

10. Backplate Helps protect the back of the user. 11. Intake Screen Helps prevent leaves entering intake. 12. Air Filter Cover Covers and protects the air filter element. 13. Fuel Filler Cap For closing the fuel tank. 30
English Ignition System Electronic magneto ignition (breakerless) Spark plug (resistor NGK CMR 6 H, type): BOSCH USR 4AC Electrode gap: 0.028 in. (0.7 mm) Fuel System All position diaphragm carburetor with integral fuel pump Fuel tank capacity: 47.3 fl.oz (1.4 l) Blower Data Maximum air flow rate BR 500: 812 cf/min (1380 m3/h) BR 550: 877 cf/min (1490 m3/h) BR 600: 1012 cf/min (1720 m3/h) Maximum air flow rate with nozzle BR 500: 477 cf/min (810 m3/h) BR 550: 530 cf/min (900 m3/h) BR 600: 712 cf/min (1012 m3/h) Air Velocity with Nozzle BR 500: BR 550: BR 600: 181 mph (81 m/s) 199 mph (89 m/s) 201 mph (90 m/s) Weight dry BR 500: BR 550: BR 600:

Special Accessories

22.3 lbs (10.1 kg) 21.8 lbs (9.9 kg) 21.6 lbs (9.8 kg) Contact your STIHL dealer for information regarding special accessories that may be available for your product.

Maintenance and Repairs

Users of this unit should carry out only the maintenance operations described in this manual. Other repair work may be performed only by authorized STIHL service shops. Warranty claims following repairs can be accepted only if the repair has been performed by an authorized STIHL servicing dealer using original STIHL replacement parts. Original STIHL parts can be identified by the STIHL part number, the { logo and, in some cases, by the STIHL parts symbol K. The symbol may appear alone on small parts.
STIHL Incorporated Federal Emission Control Warranty Statement
Not for California Your Warranty Rights and Obligations The U.S. Environmental Protection Agency (EPA) and STIHL Incorporated are pleased to explain the Emission Control System Warranty on your equipment type engine. In the U.S. new 1997 and later model year small off-road equipment engines must be designed, built and equipped, at the time of sale, to meet the U.S. EPA regulations for small non road engines. The equipment engine must be free from defects in materials and workmanship which cause it to fail to conform with U.S. EPA standards for the first two years of engine use from the date of sale to the ultimate purchaser. STIHL Incorporated must warrant the emission control system on your small off-road engine for the period of time listed below provided there has been no abuse, neglect or improper maintenance of your small off-road equipment engine. Your emission control system includes parts such as the carburetor and the ignition system. Also included may be hoses, and connectors and other emission-related assemblies. Where a warrantable condition exists, STIHL Incorporated will repair your small off-road equipment engine at no

English you have any questions regarding your warranty rights and responsibilities, please contact a STIHL customer service representative at 1-800-4678445 or you can write to STIHL Inc., 536 Viking Drive, P.O. Box 2015, Virginia Beach, VA 23450-2015. Coverage by STIHL Incorporated STIHL Incorporated warrants to the ultimate purchaser and each subsequent purchaser that your small off-road equipment engine is designed, built and equipped, at the time of sale, to meet all applicable emission regulations. STIHL Incorporated also warrants to the initial purchaser and each subsequent purchaser that your engine is free from defects in materials and workmanship which cause the engine to fail to conform to applicable emission regulations for a period of two years. Defects Warranty Period The warranty periods will begin on the date the utility equipment engine is purchased by the initial purchaser. If any emission-related part on your engine is defective, the part will be replaced by STIHL Incorporated at no cost to the owner. Add-on or modified parts that are not exempted by CARB may not be used. The use of any non exempted add-on or modified parts will be grounds for disallowing a warranty claim. STIHL Incorporated will not be liable to warrant failures of warranted parts caused by the use of a non exempted add-on or modified part. BR 500, BR 550, BR 600 3. The warranty on emissions-related parts will be interpreted as follows: 1. Any warranted part that is not scheduled for replacement as required maintenance in the written instructions required in the Emission Warranty Parts List (see below) must be warranted for the warranty period defined in Subsection COVERAGE BY STIHL INCORPORATED, see above. If any such part fails during the period of warranty coverage, it must be repaired or replaced by the manufacturer according to Subsection (4) below. Any such part repaired or replaced under the warranty must be warranted for the remaining warranty period. Any warranted part that is scheduled only for regular inspection in the written instructions required by the Emission Warranty Parts List (see below) must be warranted for the warranty period defined in Subsection COVERAGE BY STIHL INCORPORATED, see above. A statement in such written instructions to the effect of "repair or replace as necessary" will not reduce the period of warranty coverage. Any such part repaired or replaced under warranty must be warranted for the remaining warranty period. Any warranted part that is scheduled for replacement as required maintenance in the written instructions required by the Emission Warranty Parts List (see below) must be warranted for the period of time prior to the first scheduled replacement point for that part. If the part fails prior to the first scheduled replacement, the part must be repaired or replaced by the engine manufacturer according to Subsection (4) below. Any such part repaired or replaced under warranty must be warranted for the remainder of the period prior to the first scheduled replacement point for the part. 4. Repair or replacement of any warranted part under the warranty must be performed at a warranty station at no charge to the owner. Notwithstanding the provisions of Subsection (4) above, warranty services or repairs will be provided at all manufacturer distribution centers that are authorized to service the subject engines. The owner must not be charged for diagnostic labor that leads to the determination that a warranted part is in fact defective, provided that such diagnostic work is performed at a warranty station.

Warranty Work STIHL Incorporated shall remedy warranty defects at any authorized STIHL servicing dealer or warranty station. Any such work shall be free of charge to the owner if it is determined that a warranted part is defective. Any manufacturer approved or equivalent replacement part may be used for any warranty maintenance or repairs on emission-related parts and must be provided without charge to the owner. STIHL Incorporated is liable for
English damages to other engine components caused by the failure of a warranted part still under warranty. Emission Warranty Parts List Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition Module), Spark Plug, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line, Fuel Line Fittings, Clamps, Fasteners Where to make a Claim for Warranty Service Bring the STIHL product to any authorized STIHL servicing dealer and present the signed STIHL product registration card, or the print-out of the electronic product registration. Limitations The repair or replacement of any warranted part otherwise eligible for warranty coverage may be excluded from such warranty coverage if STIHL Incorporated demonstrates that the STIHL product has been abused, neglected, or improperly maintained, and that such abuse, neglect, or improper maintenance was the direct cause of the need for repair or replacement of the part. That notwithstanding, any adjustment of a component that has a factory installed, and properly operating, adjustment limiting device is still eligible for warranty coverage.

Trademarks

STIHL Registered Trademarks STIHL { K The color combination orange-grey (U.S. Registrations #2,821,860; #3,010,057, #3,010,058, #3,400,477; and #3,400,476)
BioPlus Easy2Start EasySpool ElastoStart Ematic / Stihl-E-Matic FixCut HT Plus IntelliCarb Master Control Lever Micro Pro Mark Quad Power Quiet Line
4-MIX AUTOCUT EASYSTART FARM BOSS OILOMATIC STIHL Cutquik STIHL DUROMATIC STIHL Quickstop STIHL ROLLOMATIC STIHL WOOD BOSS TIMBERSPORTS YARD BOSS Some of STIHLs Common Law Trademarks
STIHL M-Tronic STIHL Compact STIHL HomeScaper Series STIHL Interchangeable Attachment Series STIHL Magnum / Stihl-Magnum STIHL MiniBoss STIHL MotoPlus 4 STIHL Multi-Cut HomeScaper Series STIHL OUTFITTERS STIHL PICCO STIHL PolyCut STIHL PowerSweep STIHL Precision Series STIHL Protech STIHL RAPID STIHL SuperCut