STIHL BR 430, BR 350 Instruction Manual

STIHL BR 350, 430

WARNING

Read Instruction Manual thoroughly before use and follow all safety precautions – improper use can cause serious or fatal injury.

ADVERTENCIA

Antes de usar la máquina lea y siga todas las precauciones de seguridad dadas en el manual de instrucciones – el uso incorrecto puede causar lesiones graves o mortales.

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Instruction Manual Manual de instrucciones

Instruction Manual 1 - 36

Manual de instrucciones 37 - 76

Contents

English

Guide to Using this Manual 2 Safety Precautions and Working

Techniques 2 Assembling the Unit 10 Adjusting the Throttle Cable 13 Fitting the Harness 14 Fuel 14 Fueling 15

Original Instruction ManualPrinted on chlorine-free paper

Information Before You Start 16 Starting / Stopping the Engine 17 Operating Instructions 19 Replacing the Air Filter 20 Engine Management 20 Adjusting the Carburetor 21 Spark Plug 22 Engine Running Behavior 23 Rewind Starter 23 Storing the Machine 23 Inspections and Maintenance by

Dealer 24 Maintenance and Care 25 Main Parts 27

Printing inks contain vegetable oils, paper can be recycled.

Specifications 29 Maintenance and Repairs 30 Disposal 31

STIHL Incorporated Federal Emission Control Warranty Statement 31

STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement 33

Trademarks 35

Allow only persons who fully understand this manual to operate your blower.

To receive maximum performance and satisfaction from your STIHL blower, it is important that you read, understand and follow the safety precautions and the operating and maintenance instructions in chapter "Safety Precautions and Working Techniques" before using your blower. For further information you can go to www.stihlusa.com.

Contact your STIHL dealer or the STIHL distributor for your area if you do not understand any of the instructions in this manual.

WARNING

Because a blower is a high-speed tool, some special safety precautions must be observed as with any other power tool to reduce the risk of personal injury. Careless or improper use may cause serious or even fatal injury.

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0458-456-8621-D. VA2.A15.

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BR 350, BR 430

English

Guide to Using this Manual

Pictograms

The meanings of the pictograms attached to or embossed on the machine are explained in this manual.

Depending on the model concerned, the following pictograms may be on your machine.

Fuel tank for gasoline and engine oil mixture

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:

N Loosen the screw (1). N 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.

WARNING

Indicates a hazardous situation which, if not avoided, could result in severe or fatal injury.

NOTICE

Indicates a risk of property damage, including damage to the machine or its individual components.

Engineering Improvements

STIHL’s philosophy is to continually improve all of its products. As a result, engineering changes and improvements are made from time to time. Therefore, some changes, modifications and improvements may not be covered in this manual. If the operating characteristics or the appearance of your machine differs from those described in this manual, please contact your STIHL dealer or the STIHL distributor for your area for assistance.

Safety Precautions and Working Techniques

Because a blower is gasoline-powered and produces a strong air blast, special safety pre cautions must be observed to reduce the risk of personal injury.

It is important that you read, fully understand and observe the following safety precautions and warnings. Read the instruction manual and the safety precautions periodically. Careless or improper use may cause serious or fatal injury.

Have your STIHL dealer show you how to operate your power tool. Observe all applicable local safety regulations, standards and ordinances.

WARNING

Do not lend or rent your power tool without the instruction manual. Be sure that anyone using it understands the information contained in this manual.

WARNING

The use of this machine may be hazardous.

Use your blower only for clearing leaves, grass, paper and dust in yards, gardens, sport stadiums, parks, driveways and parking lots.

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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. the operator

2. the power tool

3. the use of the power tool.

THE OPERATOR

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

BR 350, BR 430

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consult their physician and the pacemaker manufacturer before operating this tool.

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 protec tive glasses with adequate top and side protection complying with ANSI Z87 "+" (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 jack ets, 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 "Main Parts."

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 build up of static electricity.

If your blower is properly assembled and you are still experiencing static shocks, make sure that your footwear has conductive soles and try operating your

BR 350, BR 430

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unit without gloves, which may be interfering with the conduction of the charge.

THE USE OF THE POWER TOOL

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 oil-

gasoline 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 seri ous 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 combusti ble 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.

WARNING

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.

Different models may be equipped with different fuel caps.

See also the "Fueling" chapter in your Instruction Manual for additional information.

Bayonet Fuel Filler Cap

Never use a tool to open or close the bayonet fuel filler cap, as this could damage the cap and cause fuel to leak out.

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The bayonet fuel filler cap must be closed with care after refuelling.

Screw Cap

WARNING

Unit vibrations can cause an improperly tightened fuel filler cap to loosen or come off and spill quanti ties of fuel. In order to reduce the risk of fuel spillage and fire, tighten the fuel filler cap by hand as securely as possible.

Before Starting

WARNING

Always check your power tool for proper condition and operation before starting, particularly the throttle trigger, setting lever and momentary stop switch. The throttle trigger must move freely and always spring back to the idle position. Never attempt to modify the controls or safety devices.

WARNING

Check fuel system for leaks, especially the visible parts, e.g., filler cap, hose connections, manual fuel pump (only for power tools equipped with a manual fuel pump). Do not start the engine if there are leaks or damage – risk of fire! Have the machine repaired by a servicing dealer before using it.

WARNING

Never operate your power tool if it is damaged, improperly adjusted or maintained, or not completely or securely assembled.

WARNING

Check that the spark plug boot is

securely mounted on the spark plug – a loose boot may cause arcing that could ignite combustible fumes and cause a fire.

Keep the handles clean and dry at all times; it is particularly important to keep them free of moisture, pitch, oil, fuel mix, grease or resin in order for you to maintain a firm grip and properly control your power tool.

WARNING

To reduce the risk of injury from parts thrown by the fan wheel, check the fan housing for damage (cracks or holes that could allow foreign objects to contact the fan wheel). If any such damage is found, stop using the unit and contact your STIHL dealer for repair.

WARNING

Adjust carrying harness to suit your size before starting work.

In an emergency, you may slip out of the harness and throw off the machine quickly. Try slipping out of the harness a number of times before using the machine in order to become accustomed to it. Do not throw off the machine while practicing as it could damage the machine.

Starting To reduce the risk of fire and burn

injuries, start the engine at least 10 feet (3 m) from the fueling spot, outdoors only.

WARNING

Your power tool is a one-person machine. To reduce the risk of eye or other injury from thrown objects, insure that bystanders are at least 50 feet (15 m) away during use. Stop operation immediately if you are approached.

WARNING

This unit is equipped with an ignition system that is normally in operational readiness. After the setting lever is used to stop the engine, it automatically springs back to the "on" position. If the engine is warm, it may be possible to start it by simply pulling the starter rope, with no further adjustments. To reduce the risk of injury, be particularly alert to keep children away from the unit.

For specific starting instructions, see the appropriate section of your manual. Place the power tool on firm ground or other solid surface in an open area. Maintain good balance and secure footing.

BR 350, BR 430

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0009BA001 KN

WARNING

When you pull the starter grip, do not wrap the starter rope around your hand. Do not let the grip snap back, but guide the starter rope to rewind it properly. Failure to follow this procedure may result in injury to your hand or fingers and may damage the starter mechanism.

Once the engine has started, immediately blip the throttle trigger, which should cause the choke knob to move to the run position and allow the engine to slow down to idle.

During Operation Holding and Controlling the Power Tool

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.

Watch out for small animals when using the blower on open ground, in yards and gardens.

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.

To reduce the risk of stumbling and loss of control, do not walk backward while operating the machine.

WARNING

To reduce the risk of injury from loss of control, never work on a ladder or on any other insecure support.

Working Conditions To minimize blowing time, use a rake

and broom to loosen dirt particles before you start blowing.

Save water by using a blower instead of a water hose for lawn and garden work wherever possible, e.g. for cleaning yards and patios.

Recommended working technique to minimize air pollution:

– If conditions are very dusty, dampen

surfaces slightly before blowing.

– Pull out the nozzle to full length so

that the airstream is at ground level.

– Do not blow particles in the direction

of bystanders, in particular in the direction of children, pets, open windows or freshly washed vehicles. Take special care in such situations.

– Remove the blow-swept debris in

rubbish bins – do not blow it onto the neighbor's land.

Recommended working technique to minimize noise:

– Operate your power tool at

reasonable times only – not early in the morning, late at night or during midday rest periods when people could be disturbed. Observe local rest periods. Normal recommendation for professional use on weekdays: 9:00hrs to 12:00hrs and 15:00hrs to 17:00hrs. Be considerate of neighbors at weekends.

– Fewer engines mean less noise.

Where possible, do not run more than one power tool at any time.

– Operate blowers at the lowest

engine speed necessary to accomplish the task.

– Check your blower before starting

work. Pay special attention to the muffler, air intakes and air filter.

Operate and start your power tool only outdoors in a well-ventilated area. Operate it under good visibility and daylight conditions only. Work carefully.

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WARNING

As soon as the engine is running, this product gen erates toxic exhaust fumes containing chemi cals, such as unburned hydrocarbons (including benzene) and carbon monoxide, that are known to cause respira tory problems, cancer, birth defects, or other reproductive harm. Some of the gases (e.g. carbon monoxide) may be color less and odorless. To reduce the risk of serious or fatal injury/illness from inhaling toxic fumes, never run the machine indoors or in poorly venti lated locations. If exhaust fumes become concen trated due to insufficient ventilation, clear obstruc tions from work area to permit proper ventilation before proceeding and/or take frequent breaks to allow fumes to dissipate before they become concentrated.

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 illness, 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.

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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 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 in this instruction manual. Please refer to the maintenance chart in this instruction 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 this instruction manual. Have such work performed by your STIHL servicing dealer only.

Do not clean your machine with a pressure washer. The solid jet of water may damage parts of the machine.

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. Your muffler is equipped with a sparkarresting screen to reduce the risk of

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0009BA002 KN

0009BA003 KN

0009BA004 KN

0009BA027 KN

0009BA005 KN

fire; never operate your power tool if the screen is missing, damaged or clogged. Remember that the risk of a brush or forest fire is greater in hot or dry weather.

In California, it is a violation of § 4442 or

§ 4443 of the Public Resources Code to use or operate gasoline-powered tools on forest-covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a complying spark arrester that is maintained in effective working order. The owner/operator of this product is responsible for properly maintaining the spark arrester. Other states or governmental entities/agencies, such as the U.S. Forest Service, may have similar requirements. Contact your local fire agency or forest service for the laws or regulations relating to fire protection requirements.

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.

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

The combination wrench and screwdriver are in the supplied accessory bag.

BR 350 Blower Tube

Fitting the pleated hose on the elbow

N Ease the slip ring (2) apart and push

it over the elbow (1).

N Open the hose clamp (3) and fit it on

the pleated hose (4).

N Close the hose clamp (3) – engage

tab in recess.

N Push the pleated hose (4) over the

slip ring (2) as far as stop.

N Position the hose clamp (3) as

shown in the illustration.

N Tighten down the screw (arrow). Mounting the blower tubes and nozzle

N Assemble the blower tubes (5) and

nozzle (6).

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0009BA006 KN

0009BA007 KN

452BA101 KN

452BA102 KN

452BA096 KN

452BA108 KN

Mounting the control handle

N Pull the ends of the clamp on the

control handle (7) apart and push it over stub of pleated hose (4).

N Attach throttle cable to retainer on

the hose clamp (3).

Adjusting the control handle N Put the machine on your back and

adjust the harness – see "Fitting the Harness".

BR 430 Blower Tube

Mounting the control handle

N Pull the two halves of the clamp

apart.

N Push the control handle (1) onto the

blower tube (2).

Mounting the blower tubes

N Depending on your size and reach:

Push blower tube (1) up to the appropriate mark on the blower tube (2).

N Rotate the blower tube (1) in the

direction of the arrow and engage it in the appropriate slot (3).

Mounting the hose clamps and pleated hose

N Push the blower tube (5) into the

stub of pleated hose (4) as far as the stop.

N Move the control handle (7) along

the tube to the most comfortable position.

N Tighten down the screw in the

control handle (7).

BR 350, BR 430

N Line up the control handle (1) with

the tube's seam – as shown.

N Secure the control handle (1) with

the screw (3) so that it can still be moved on the blower tube (2).

N Push the hose clamp (1) (with

retainer for throttle cable) onto the elbow (3) – the positioning marks must face to the left.

N Push the pleated hose (2) over the

elbow (3).

English

452BA109 KN

452BA103 KN

452BA104 KN

452BA111 KN

452BA112 KN

452BA110 KN

Removing the nozzle

N Push the hose clamp (1) onto the

pleated hose (2).

N Line up the positioning marks on the

hose clamp (1) and elbow (3) – the screw recess facing down.

N Secure the hose clamp (1) with the

screw (4).

N Push the hose clamp (5) (without

retainer for throttle cable) onto the elbow (6) – the positioning marks must face to the right.

N Push the blower tube (6) into the

pleated hose (2).

N Push the hose clamp (5) onto the

pleated hose (2).

N Line up the hose clamp (5) and

blower tube (6) – as shown.

N Secure the hose clamp (5) with the

screw (7).

Mounting the nozzle

N Push the nozzle (1) onto the blower

tube (2) and engage it on the lugs (3).

N Rotate the nozzle (1) in the direction

of the arrow until the lugs (3) are covered.

N Pull the nozzle (1) off the blower

tube (2).

Adjusting the control handle N Put the machine on your back and

adjust the harness – see "Fitting the Harness".

N Move the control handle (1) along

the blower tube (2) to the most comfortable position.

N Secure the control handle (1) with

the screw (3).

BR 350, BR 430

N Engage the throttle cable (4) with

452BA100 KN

0009BA008 KN

sleeve (5) in the retainer (6).

Wear mark on nozzle

N Secure the velcro strip to the blower

tube – pull the flap through the buckle.

N Secure the blower tube to the

handle on the backplate.

English

Adjusting the Throttle Cable

It may be necessary to correct the adjustment of the throttle cable after assembling the machine or after a prolonged period of operation.

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

N Set throttle trigger to the full throttle

position – as far as stop.

N Carefully rotate the screw in the

throttle trigger in the direction of the arrow until you feel initial resistance. Then rotate it another full turn.

The front end of the nozzle wears away due to abrasive ground contact during operation. Replace the nozzle when it has worn as far as the wear mark.

Fitting the transport aid When storing or transporting the

machine:

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373BA003 KN

373BA004 KN

Fitting the Harness

Adjusting the Harness

N Pull the ends of the straps

downwards to tighten the harness.

Loosening the Harness

N Lift the tabs of the sliding adjusters. N Adjust the harness so that the

backplate fits snugly and securely against your back.

Fuel

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 two-stroke air cooled engine oil.

Use mid-grade unleaded gasoline with a minimum octane rating of 89 ((R+M)/2) and no more than 10% ethanol content.

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 high-quality unleaded gasoline!

Gasoline with an ethanol content of more than 10% can cause running problems and major damage in engines and should not be used.

The ethanol content in gasoline affects engine running speed – it may be necessary to readjust the carburetor if you use fuels with various ethanol contents.

WARNING

To reduce the risk of personal injury from loss of control and/or contact with the running cutting tool, do not use your

unit with incorrect idle adjustment. At correct idle speed, the cutting tool should not move.

If your power tool shows an incorrect idle adjustment, have your STIHL dealer check your power tool and make proper adjustments and repairs.

The idle speed and maximum speed of the engine change if you switch from a fuel with a certain ethanol content to another fuel with a much higher or lower ethanol content.

This problem can be avoided by always using fuel with the same ethanol content.

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 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.).

WARNING

Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the container from your vehicle and place the container on the ground before filling. To reduce the risk of sparks from static discharge and resulting fire and/or explosion, do not fill fuel containers that are sitting in or on a vehicle or trailer.

BR 350, BR 430

English

0002BA086 KN

0002BA091 KN

0002BA092 KN

The container should be kept tightly closed in order to limit the amount of moisture that gets into the mixture.

The machine‘s fuel tank should be cleaned as necessary.

Fuel mix ages

Only mix sufficient fuel for a few days work, not to exceed 30 days of storage. Store in approved fuel-containers only. When mixing, pour oil into the container first, and then add gasoline. Close the container and shake it vigorously by hand to ensure proper mixing of the oil with the fuel.

Gaso line

Oil (STIHL 50:1 or equiva lent high-quality oils)

US gal. US fl.oz.

12.6 2 1/2 6.4

512.8 Dispose of empty mixing-oil containers

only at authorized disposal locations.

Fueling

Preparations

N Before fueling, clean the fuel filler

cap and the area around it so that dirt cannot fall into the tank.

Thoroughly shake up the mixture in the canister before fueling your machine.

WARNING

In order to reduce the risk of fire and personal injury from escaping gas vapor and fumes, remove the fuel filler cap carefully so as to allow any pressure build-up in the tank to release slowly.

Do not spill any fuel and do not fill the tank up to the brim.

Your power tool comes standard with either a screw-type or bayonet-type fuel cap.

Bayonet fuel cap

Screw-type tank cap

Open the bayonet fuel filler cap

WARNING

Never use a tool to open the bayonet catch. This could damage the cap and cause fuel to leak out.

BR 350, BR 430

English

0002BA014 KN

0002BA015 KN

002BA447 KN

002BA448 KN

0009BA009 KN

N Press the cap down with your hand

as far as possible, turn it counterclockwise (approx. 1/8 turn) and remove it.

Fueling

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

Close the bayonet fuel filler cap

N Fit the cap and turn it until it

engages in the bayonet mount.

N Press the cap down with your hand

as far as possible and turn it clockwise (approx. 1/8 turn) until it engages completely.

Opening the threaded filler cap

N Turn the cap counterclockwise until

it can be removed from the tank opening.

N Remove the filler cap.

Refueling

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

Closing the threaded filler cap

N Position cap. N Turn the cap clockwise as far as it

will go and tighten it as securely as possible by hand.

Information Before You Start

NOTICE

With the engine stopped and before starting, check the air intakes between the backplate and powerhead for blockages and clean if necessary.

Positions of setting lever – BR 350

Run position F Engine runs or is ready to start. Throttle

trigger (2) can be moved to any position. Switch off engine † Ignition is interrupted, engine stops. The

setting lever (1) is not locked in this position. It springs back to the run position F. The ignition is switched on again.

BR 350, BR 430

English

0009BA010 KN

452BA122 KN

0009BA011 KN

0009BA021 KN

Fixed throttle

The throttle trigger (2) can be locked in any position:

To disengage the lock: N Return the setting lever (1) to the

run position F.

Positions of setting lever – BR 430

Lock positions C The throttle trigger (2) 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.

Starting / Stopping the Engine

Starting the Engine

N Observe safety precautions.

NOTICE

Start your unit on a clean, dust-free surface only to ensure that no dust is sucked in.

BR 350

BR 430

Run position F Engine runs or is ready to start. Throttle

trigger (2) can be moved to any position. Switch off engine † Ignition is interrupted, engine stops. The

setting lever (1) is not locked in this position. It springs back to the run position F. The ignition is switched on again.

BR 350, BR 430

N The setting lever must be on F

English

0009BA012 KN

0009BA013 KN

0009BA014 KN

0009BA028 KN

0009BA016 KN

0009BA022 KN

0009BA017 KN

N Press the fuel pump bulb at least

eight times – even if the bulb is filled with fuel.

Cold engine (cold start)

N Push the choke knob in and turn it to

Warm engine (warm start)

N Push the choke knob in and turn it to

Also use this setting if the engine has been running but is still cold.

Cranking

N Place the unit securely on the

ground and make sure that bystanders are well clear of the nozzle outlet.

N Make sure you have a firm footing:

Hold the unit with your left hand on the housing and put one foot against the base plate to prevent it slipping.

N Pull the starter grip slowly with your

right hand until you feel it engage and then give it a brisk strong pull. Do not pull out the starter rope to full length – it might otherwise break.

N Do not let the starter grip snap back.

Guide it slowly back into the housing so that the starter rope can rewind properly.

N Continue cranking until the engine

runs.

As soon as the engine runs

BR 350

BR 430

N Operate the throttle trigger.

N Choke knob automatically returns to

the run position e when the throttle trigger is operated.

At very low outside temperatures N Open throttle slightly – warm up the

engine for a short period.

BR 350, BR 430

English

0009BA018 KN

0009BA023 KN

Stopping the Engine

BR 350

BR 430

N Move the setting lever in the

direction of † – the engine stops – the setting lever springs back to the on position.

If the engine does not start

N Check that all settings are correct. N Check that there is fuel in the tank

and refuel if necessary.

N Check that the spark plug boot is

properly connected.

N Repeat the starting procedure. Fuel tank run until completely dry N After refueling, press the manual

fuel pump bulb at least five times – even if the bulb is filled with fuel.

N Set the choke knob according to

engine temperature.

N Start the engine.

Operating Instructions

During Operation

After a long period of full throttle operation, allow the engine to run for a short while at idle speed so that engine heat can be dissipated by the flow of cooling air. This helps protect enginemounted components (ignition, carburetor) from thermal overload.

After Finishing Work

Storing for a short period: Wait for the engine to cool down. Keep the machine in a dry place, well away from sources of ignition, until you need it again. For longer out-of-service periods – see "Storing the Machine".

Other Hints on Starting

Engine stalls in cold start position c or under acceleration

N Move the choke knob to o and

continue cranking until the engine runs.

Engine does not start in warm start position o

N Move the choke knob to c and

continue cranking until the engine runs.

BR 350, BR 430

English

0002BA088 KN

0002BA089 KN

Replacing the Air Filter

Dirty air filters reduce engine power, increase fuel consumption and make starting more difficult.

If there is a noticeable loss of engine power

Engine Management

Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburation, ignition, timing and valve or port timing) without the addition of any major hardware.

N Remove the filter element (3). N Replace dirty or damaged filters. N Fit the new filter in the filter housing. N Fit the filter cover. N Fit the screws and tighten them

down firmly.

N Turn the choke knob to c . N Loosen the screws (1). N Remove the filter cover (2).

BR 350, BR 430

English

0002BA082 KN

0002BA083 KN

Adjusting the Carburetor

General Information

The carburetor comes from the factory with a standard setting.

This setting provides an optimum fuel-air mixture under most operating conditions.

Preparations

N Shut off the engine. N Check the air filter and clean or

replace if necessary.

N Check that the throttle cable is

properly adjusted – readjust if necessary – see chapter on "Adjusting the Throttle Cable".

N Check the spark arresting screen

(not in all models, country-specific) in the muffler and clean or replace if necessary.

BR 350, BR 430

Standard Setting

N Turn high speed screw (H)

counterclockwise as far as stop (no more than 3/4 turn).

N Turn the low speed screw (L)

clockwise as far as stop, then turn it back 3/4 turn.

Adjusting Idle Speed

N Carry out the standard setting. N Start and warm up the engine.

Engine stops while idling N Turn the idle speed screw (LA)

slowly clockwise until the engine runs smoothly.

Erratic idling behavior, engine stops even though setting of LA screw has been corrected, poor acceleration

Idle setting is too lean N Turn the low speed screw (L)

counterclockwise, no further than stop, until the engine runs and accelerates smoothly.

Erratic idling behavior Idle setting is too rich N Turn the low speed screw (L)

clockwise, no further than stop, until the engine runs and accelerates smoothly.

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 at High Altitude

A slight correction of the setting may be necessary if the engine does not run satisfactorily:

N Carry out the standard setting. N Warm up the engine. N Turn high speed screw (H) slightly

clockwise (leaner) – no further than stop.

NOTICE

After returning from high altitude, reset the carburetor to the standard setting.

If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating.

English

0002BA049 KN

000BA039 KN

002BA363 KN

Spark Plug

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

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 Pull off the spark plug boot (1)

vertically.

N Unscrew the spark plug (2).

Checking the Spark Plug

N Clean dirty spark plug. N Check electrode gap (A) and

readjust if necessary – see chapter "Specifications."

N 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.

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 securely 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.

Installing the spark plug

N Screw home the spark plug, fit the

boot and press it down firmly.

BR 350, BR 430

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