STIHL SH 55, SH 85, BG 65, BG 55, BG 85 Owner's Manual

STIHL BG 55, 65, 85, SH 55, 85

WARNING

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

ADVERTENCIA

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 - 35

Manual de instrucciones 36 - 72

Contents

English

Guide to Using this Manual 2 Safety Precautions and Working

Techniques 2 Using the Unit 10 Working Technique 11 Assembling the Blower 11 Assembling the Vacuum Shredder 12 Fuel 14

Original Instruction ManualPrinted on chlorine-free paper

Fueling 15 Starting / Stopping the Engine 16 Cleaning the Air Filter 18 Engine Management 18 Adjusting the Carburetor 19 Catalytic Converter 21 Spark Plug 21 Engine Running Behavior 22 Rewind Starter 22 Storing the Machine 23 Inspections and Maintenance by

Dealer 23 Maintenance and Care 24 Main Parts 25

Printing inks contain vegetable oils, paper can be recycled.

Specifications 28 Special Accessories 29 Maintenance and Repairs 29 Disposal 30 STIHL Incorporated Federal

Emission Control Warranty Statement 30

STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement 32

Trademarks 34

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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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 for assistance.

Safety Precautions and Working Techniques

Because the use of any blower may be danger ous, special safety precautions 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

Use your blower only for clearing leaves, twigs, grass, clippings, paper, debris, and dust in yards, gardens, sport stadiums, parks, paths, streets, driveways and parking lots and for similar tasks.

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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.

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 whitefinger 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.

WARNING

This STIHL blower is not equipped with an anti-vibration ("AV") system. Other STIHL blower models are available with 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.

All factors which contribute to whitefinger 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 whitefinger disease. In order to reduce the risk of whitefinger disease and carpal tunnel syndrome, please note the following:

– Keep your hands warm. – A power tool with loose components

will tend to have higher vibration levels.

– Maintain a firm grip at all times, but

do not squeeze the handles with constant, excessive pressure. Take frequent breaks.

All the above-mentioned precautions do not guarantee that you will not sustain whitefinger 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.

Proper Clothing

WARNING

To reduce the risk of injury, the operator should wear proper protective apparel.

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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 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 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. Do not wear sandals or go barefoot.

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 blower 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 tube and nozzle can cause a static charging of the blower tube. 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 tube 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.

THE USE OF THE POWER TOOL

Transporting the Power Tool

WARNING

When transporting your power tool 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).

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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

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

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, throttle trigger lockout and stop switch. The throttle trigger must move freely. Never attempt to modify the controls or safety devices.

WARNING

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

To reduce the risk of injury, do not operate your blower unless it has a properly mounted blower tube.

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.

WARNING

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.

Starting

WARNING

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

WARNING

Your power tool is a one-person machine. Do not allow other persons in the general work area, even when starting.

For specific starting instructions, see the appropriate section of your manual. Place the power tool on firm ground or

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other solid surface in an open area. Maintain good balance and secure footing.

WARNING

To reduce the risk of injury from loss of control, do not attempt to "drop start" your power tool.

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.

WARNING

Once the engine has started, immediately blip the throttle trigger, which should release the starting throttle and allow the engine to slow down to idle.

During Operation Holding and Controlling the Power Tool The blower is designed for single-

handed operation with either the right or left hand on the control handle.

Special care must be taken in slippery conditions (wet ground, snow) and in difficult, overgrown terrain. Watch for hidden obstacles such as tree stumps, roots 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

To reduce the risk of injury from loss of control, never work on a ladder, in a tree or any other insecure support. Never hold the machine above shoulder height.

Working Conditions Operate and start your power tool only

outdoors in a well ventilated area. Operate it under good visibility and daylight conditions only. Work carefully.

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.

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. 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, understand and follow all warnings and instructions contained in 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

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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 stop switch to 0.

WARNING

In order to reduce the risk of personal or even fatal injury to bystanders from blown objects keep bystanders at least 16 feet (5 m) away when the power tool is running.

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. Do not direct airblast towards pets.

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

Never modify your muffler. Any modification could cause an increase in heat radiation, sparks or sound level, thereby increasing the risk of fire, burn injury or hearing loss. You may also permanently damage the engine. Have your muffler serviced and repaired by your STIHL servicing dealer only.

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. 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 away from any combustible substances.

WARNING

An improperly mounted or damaged cylinder housing or a damaged/deformed muffler shell may interfere with the cooling process of the muffler. To reduce the risk of fire or burn injury, do not continue work with a damaged or improperly mounted cylinder housing or a damaged/deformed muffler shell.

Your muffler is furnished with a spark arresting screen designed to reduce the risk of fire from the emission of hot particles. Never operate your unit with a missing or damaged spark arresting screen. If your gas/oil mix ratio is correct (i.e., not too rich), this screen will normally stay clean as a result of the heat from the muffler and need no service or maintenance. If you experience loss of performance and you suspect a clogged screen, have your muffler maintained by a STIHL servicing dealer. Some state or federal laws or regulations may require a properly maintained spark arrestor for certain

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295BA053 KN

uses. See the "Maintenance, Repair and Storing" section of these Safety Precautions. Remember that the risk of a brush or forest fire is greater in hot or dry conditions.

WARNING

Some STIHL power tools are equipped with a cata lytic converter, which is designed to reduce the exhaust emissions of the engine by a chemical process in the muffler. Due to this process, the muffler does not cool down as rapidly as con

ventional mufflers when the engine returns to idle or is shut off. To reduce the risk of fire and burn injuries when using a cat alytic converter, always set your power tool down in the upright position and never locate it where the muffler is near dry brush, grass, wood chips or other combustible materi

als while it is still hot. Using the Vacuum Attachment For specific assembling instructions,

see the appropriate section of your instruction manual. Do not use this appliance in vacuum mode without the catcher bag.

The vacuum attachment is designed for two-handed operation. Hold and operate the unit with your right hand on the

control handle and your left hand on the assist handle.

Wear the catcher bag shoulder strap over your left shoulder – not across your chest – so that you can quickly throw off the unit and catcher bag in an

emergency.

WARNING

To reduce the risk of injury, do not operate the machine unless it is fully assembled with a properly mounted suction tube and catcher bag.

WARNING

In order to reduce the risk of injury from contact with rotating parts and damage to the engine, the intake screen must always be closed and the locking tab engaged when the suction tube is not mounted. Stop engine and wait until the fan is stopped before opening the intake screen.

WARNING

To reduce the risk of per sonal injury from fire and explosion, never attempt to vacuum hot or burning substances (e.g. smol

dering ashes, glowing cigarettes) or combusti ble fluids (e.g. gasoline, paint thinners).

WARNING

Vacuuming unsuitable materials may block the fanwheel. Switch off the unit immediately. Then clear the blockage.

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WARNING

Never vacuum solid objects such as nails, steel shavings, tacks, rocks or broken glass. These objects may be struck by the fan wheel and flung away at high speed and may cause injury to the operator or bystander.

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 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!

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Using the Unit

Using the Blower

Your blower is designed for one-handed operation. It must be carried by the control handle in the right hand.

WARNING

Operate the unit only with a properly mounted blower tube.

The round nozzle is particularly suitable for use on uneven surfaces (e.g. fields and lawns).

The fan nozzle (either included with unit or available as special accessory) produces a broad and powerful airstream at ground level. It can be aimed and controlled very accurately. This nozzle is highly effective for blowsweeping sawdust, leaves, grass cuttings, etc. on paved surfaces.

Watch out for small creatures when blow-sweeping in open areas, yards and gardens.

In noise-sensitive areas, operate your unit at the lowest possible engine speed.

If necessary, dampen the surface to be cleaned in order to avoid creating too much dust.

Using the Vacuum Shredder

Your vacuum shredder is designed for two-handed operation. Hold and operate the unit with your right hand on the control handle and your left hand on the assist handle.

Wear the catcher bag shoulder strap over your left shoulder, not across your chest. This enables you to quickly remove the power tool and catcher bag in an emergency.

WARNING

Operate the unit only with a properly mounted suction tube and catcher bag.

NOTICE Vacuuming abrasive material (such as

grit, stone chips, etc.) causes the blower wheel and blower housing to wear at a rapid rate. This results in a considerable loss of suction power. In such a case you should contact your dealer. STIHL recommends a STIHL servicing dealer.

Take particular care when vacuuming wet leaves since they may block the blower wheel and elbow.

Watch out for small animals when vacuuming and blow-sweeping in open areas, yards and gardens.

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Working Technique Assembling the Blower

To minimize blowing time, use a rake and broom to loosen dirt particles before you start blowing.

Recommended working technique to minimize air pollution:

N If conditions are very dusty, dampen

surfaces slightly before blowing.

N Pull out the nozzle to full length so

that the airstream is at ground level.

N 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.

N Remove the blow-swept debris in

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

Recommended working technique to minimize noise:

N 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.

N Fewer engines mean less noise.

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

N Operate blowers at the lowest

engine speed necessary to accomplish the task.

N Check your blower before starting

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

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.

Mounting the Blower Tube

N Push the blower tube (1) with lug (2)

into the fan housing stub (3) and rotate it in the direction of the arrow to lock in position.

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N Push the nozzle (4) onto the blower

tube (1) as far as lug (5), position (a) (long) or position (b) (short), and rotate the nozzle in the direction of the arrow to it lock in position.

Removing the Blower Tube

N Use a suitable tool to lift the tab (6)

on the fan housing stub (3).

N Rotate the blower tube in the

direction of the arrow and then pull it out.

See "Assembling the Vacuum Shredder" for installation and removal of the vacuum attachment.

Assembling the Vacuum Shredder

The vacuum attachment is available as a special accessory.

Fitting the Elbow

N From inside the catcher bag (2),

push the elbow (1) through the intake opening and pull it outwards until it is firmly seated.

N Attach the carrying strap.

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N Push the elbow (1) with lug (5) into

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the fan housing stub (6) and rotate it in the direction of the arrow to lock in position.

N Tighten down the screw (4) firmly.

English

N Push the elbow (1) into the catcher

bag (2) as far as the mark and secure it with the Velcro strip (3).

N Loosen the screw (4).

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N Push guideways (9) on suction

tube (10) onto lugs (11) on fan housing and

N rotate suction tube in direction of

arrow to lock it in position.

Removing the Elbow

N Use a suitable tool to disengage the

tab (7) on the intake screen (8) and then open the intake screen.

N Loosen the screw (4).

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295BA041 KN

N Use a suitable tool to lift the tab (7) N on the fan housing stub (6). N Rotate the elbow in the direction of

the arrow and then pull it out.

N Tighten down the screw (4) firmly.

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 with a manually adjustable carburetor and should not be used in such engines.

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

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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.

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 3 months 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

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

Always thoroughly shake 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.

WARNING

After fueling, tighten fuel cap as securely as possible by hand.

Change the fuel pick up body every year

Before storing your machine for a long period, drain and clean the fuel tank and run engine until carburetor is dry.

BG 55, BG 65, BG 85, SH 55, SH 85

English

295BA013 KN

295BA031 KN

295BA018 KN

295BA043 KN

Starting / Stopping the Engine

Starting the Engine

N Observe safety precautions.

BG 55, 65, SH 55

N Move the stop switch (1) to the run

position I.

N Squeeze the throttle trigger (2) and

press in the lockout button (3) at the same time.

N Release the throttle trigger. N Release the lockout button – this is

the starting throttle position.

The lockout button can be used to lock the throttle trigger in the full throttle position during operation.

BG 85, SH 85

N Move the stop switch (1) to the run

position I.

N Squeeze the throttle trigger (2) and

mo ve the set ting le ver (4) to midwa y position at the same time.

N Release the throttle trigger – this is

the starting throttle position.

The setting lever enables you to select and hold any throttle position between idle and full throttle. Move the setting lever to the idle position before shutting off the engine.

All models Setting the choke lever

N Press the fuel pump bulb (6) at least

five times – even if the bulb is already filled with fuel.

If the engine is cold

N Set the choke lever (5) to g. If the engine is warm N Set the choke lever (5) to e. Also use this setting if the engine has

been running but is still cold.

BG 55, BG 65, BG 85, SH 55, SH 85

English

295BA016 KN

295BA018 KN

Starting

N Place the unit on the ground so that

it is secure.

N Make sure you have a firm footing:

Hold the unit firmly with your left hand on the housing and press down.

N Hold the starter grip with your right

hand.

N Pull the starter grip slowly until you

feel it engage and then give it a brisk strong pull.

NOTICE Do not pull out the starter rope all the

way – 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.

As soon as the engine runs

BG 55, 65, SH 55 N Blip the throttle trigger so that the

lockout button pops out – the engine settles down to idle speed.

BG 85, SH 85 N Move the setting level forwards to

end position.

Stopping the Engine

N Move the stop switch to 0.

Other hints on starting

If the engine stops during warm-up or acceleration

N Repeat the starting pocedure – see

"If the engine is cold".

If the engine does not start N Make sure all settings are correct

(choke shutter, throttle trigger in starting throttke position, stop switch to I).

N Repeat the starting procedure.

If the engine still does not start

N Move the stop switch to 0. N Remove the spark plug – see

"Spark Plug".

N Dry the spark plug. N Crank the engine several times with

the starter to clear the combustion chamber.

N Refit the spark plug – see "Spark

Plug".

N Move the stop switch to I. N Set the choke lever to e – even if

the engine is cold.

N Now start the engine.

If fuel tank has been run completely dry and then refueled

N Press the fuel pump bulb (6) at least

five times – even if the bulb is already filled with fuel.

N Set the choke lever according to

engine temperature.

N Start the engine.

BG 55, BG 65, BG 85, SH 55, SH 85

English

295BA019 KN

295BA046 KN

Cleaning the Air Filter

If there is a noticeable loss of engine power

N Move the choke lever to g N Squeeze the tabs (1) together. N Swing the filter cover (2) open and

take it away.

N Clean away loose dirt from around

the filter.

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 Take the filter (3) out of the filter

housing (4).

N Install a new filter. As a temporary

measure you can knock it out on the palm of your hand or blow it out with compressed air – do not wash.

Replace any damaged parts. N Fit the filter (3) in the filter

housing (4).

N Fit the filter cover (2) so that it snaps

into position.

BG 55, BG 65, BG 85, SH 55, SH 85

English

295BA084 KN

295BA085 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 the spark arresting screen

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

Different Standard Settings

Different carburetors are installed at the factory. A different standard setting is necessary for each of these carburetors.

N Determine the required standard

setting as follows: Turn the low speed screw (L) carefully clockwise as far as stop, then turn it counterclockwise.

Is range of adjustment more than 1 turn? N Continue with "Standard setting A" Is range of adjustment less than 1 turn? N Continue with "Standard setting B"

Standard setting A

N Turn high speed screw (H)

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

N Turn the low speed screw (L)

carefully clockwise until it is against its seat, then turn it back 1 full turn

Standard setting A

– High speed screw (H) = 3/4 – Low speed screw (L) = 1

Standard setting B

– High speed screw (H) = 3/4 – Low speed screw (L) = 3/4

BG 55, BG 65, BG 85, SH 55, SH 85

English

295BA085 KN

295BA086 KN

Standard setting B

N Turn high speed screw (H)

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

N Turn the low speed screw (L)

carefully 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)

clockwise until the engine runs smoothly – then back it off a 1/4 turn from that position.

Erratic idling behavior, poor acceleration (despite correction to setting of LA screw).

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

counterclockwise, 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 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.

Erratic idling behavior, engine speed drops when swinging the machine

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

clockwise until the engine runs and accelerates smoothly.

BG 55, BG 65, BG 85, SH 55, SH 85

English

295BA083 KN

000BA039 KN

Catalytic Converter Spark Plug

Power tools with a catalytic converter (depending on model) must be run on a 50 : 1 mixture of unleaded gasoline and STIHL two-stroke engine oil or equivalent two-stroke engine oil – see chapter on "Fuel".

The catayltic converter integrated in the muffler reduces the harmful emissions in the exhaust gas.

The correct carburetor setting (if adjustable) and strict observance of the prescribed mix ratio of gasoline and twostroke engine oil are essential to minimize harmful emissions and ensure a long catalytic converter service life.

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

Checking the Spark Plug

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

readjust if necessary – see "Specifications."

N Use only resistor type spark plugs of

the approved range.

Rectify problems that have caused fouling of spark plug:

– too much oil in fuel mix, – dirty air filter, – unfavorable running conditions, e.g.

operating at part load.

BG 55, BG 65, BG 85, SH 55, SH 85

N Pull off the spark plug boot (1). N Unscrew the spark plug.

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