Stihl BG 50 Instruction Manual

STIHL BG 50

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 - 28

Manual de instrucciones 29 - 60

Contents

English

Guide to Using this Manual 2 Safety Precautions and Working

Techniques 2 Assembling the Blower 10 Fuel 10 Fueling 12 Starting / Stopping the Engine 12 Cleaning the Air Filter 15

Original Instruction ManualPrinted on chlorine-free paper

Engine Management 16 Adjusting the Carburetor 16 Spark Plug 17 Engine Running Behavior 18 Storing the Machine 19 Maintenance and Care 20 Main Parts 21 Specifications 22 Maintenance and Repairs 23 Disposal 23 STIHL Incorporated Federal

Emission Control Warranty Statement 24

STIHL Incorporated California

Printing inks contain vegetable oils, paper can be recycled.

Exhaust and Evaporative Emissions Control Warranty Statement 26

Trademarks 28

Dear Customer, Thank you for choosing a quality

engineered STIHL product. It has been built using modern

production techniques and comprehensive quality assurance. Every effort has been made to ensure your satisfaction and troublefree use of the product.

Please contact your dealer or our sales company if you have any queries concerning this product.

Your

Dr. Nikolas Stihl

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0458-425-8621-C. VA0.J16.

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Guide to Using this Manual

Pictograms

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

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

Fuel tank; fuel mixture of gasoline and engine oil

Operate manual fuel pump

Symbols in text

WARNING

Warning where there is a risk of an accident or personal injury or serious damage to property.

NOTICE

Caution where there is a risk of damaging the machine or its individual components.

Engineering improvements

STIHL's philosophy is to continually improve all of its products. For this reason we may modify the design, engineering and appearance of our products periodically.

Therefore, some changes, modifications and improvements may not be covered in this manual.

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 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. 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 combus tible 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

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.

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.

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0075BA001 KN

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

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

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).

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 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

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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.

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 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.

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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 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 pro cess in the muffler. Due to this process, the muf

fler does not cool down as rapidly as conven

tional mufflers when the engine returns to idle or is shut off. To reduce the risk of fire and burn inju

ries when using a catalytic 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 com bustible materials while it is still hot.

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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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295BA003 KN

295BA005 KN

Assembling the Blower

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.

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.

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.

NOTICE

Fuel with an octane rating below 89 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 damage the engine. For this reason STIHL recommends that you use only quality unleaded gasoline!

NOTICE

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

For further details, see www.STIHLusa.com/ethanol

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

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

If your machine’s idle speed is incorrectly adjusted, have your authorized STIHL servicing dealer check your machine and make the 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 a fuel with a much higher or lower ethanol content.

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

To ensure the maximum performance of your STIHL engine, use a high quality 2cycle engine oil. To help your engine run cleaner and reduce harmful carbon deposits, STIHL recommends using STIHL HP Ultra 2-cycle engine oil or ask your dealer for an equivalent fully synthetic 2-cycle engine oil.

To meet the requirements of EPA and CARB we recommend to use STIHL HP Ultra oil.

STIHL MotoMix

STIHL recommends the use of STIHL MotoMix. STIHL MotoMix has a high octane rating and ensures that you always use the right gasoline/oil mix ratio.

STIHL MotoMix uses STIHL HP Ultra two-stroke engine oil suited for high performance engines.

For further details, see www.STIHLusa.com/ethanol

If not using MotoMix, use only STIHL two-stroke engine oil or equivalent highquality two-stroke engine oils that are designed for use in air cooled two-cycle engines.

The use of non-seasonal gasoline blends may increase the potential for pressure to build in the fuel tank during operation. For example, using a winder blend during the summer will increase pressure in the fuel tank. Always use gasoline blends appropriate to the season, altitude and other environmental factors.

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.

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

If not using MotoMix, only mix sufficient fuel for a few days of 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 mix of oil and gasoline.

Gaso line

US gal. US fl.oz.

12.6 2 1/2 6.4 5 12.8

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

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

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0000-GXX-2855-A0

0075BA003 KN

0075BA002 KN

0000-GXX-0616-A0

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.

Starting / Stopping the Engine

The blower may be equipped with different carburetors.

Version A

N Press the fuel pump bulb at least

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

Version B

N Move the stop switch (1) to the run

position I Setting the choke lever If the engine is cold

Starting the Engine – Version A

N Observe safety precautions.

N Move the choke lever (3) to g N Pull the throttle trigger (2) and hold it

there. N Crank engine until it begins to fire.

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0075BA002 KN

N Move the choke lever (3) to f. N Pull the throttle trigger (2) and hold it

there.

N Continue cranking until the engine

runs.

N Wait 10 seconds, then move the

choke lever (3) to e.

If the engine is warm Also use this setting if the engine has

been running but is still cold.

N Move the choke lever (3) to f. N Pull the throttle trigger (2) and hold it

there.

N Continue cranking until the engine

runs.

N Wait 10 seconds, then move the

choke lever (3) to e.

Cranking

0000-GXX-0617-A0

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.

Starting the Engine – Version B

N Observe safety precautions.

N Press the fuel pump bulb at least

five times – even if the bulb is

already filled with fuel.

N Move the stop switch (1) to the run

position I Setting the choke lever If the engine is cold

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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.

N Move the choke lever (3) to g

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295BA016 KN

N Pull the throttle trigger (2) and hold it

there.

N Crank engine until it begins to fire. N Set the choke lever (3) to e. N Pull the throttle trigger (2) and hold it

there.

N Continue cranking until the engine

runs. If the engine is warm Also use this setting if the engine has

been running but is still cold.

N Set the choke lever (3) to e. N Pull the throttle trigger (2) and hold it

there. N Continue cranking until the engine

runs.

Cranking

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.

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 procedure – see

"If the engine is cold".

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

(choke shutter, stop switch in run position 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 Pull the throttle trigger (2) and hold it

there.

N Now start the engine.

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If fuel tank has been run completely dry and then refueled

N Press the fuel pump bulb at least

five times – even if the bulb is filled

with fuel. N Set the choke lever according to

engine temperature. N Now start the engine.

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.

N Take the filter (3) out of the filter

housing (4).

N Install a new filter. Temporary

measure: wash the filter.

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.

0075BA006 KN

BG 50

English

295BA085 KN

Engine Management Adjusting the Carburetor

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.

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.

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.

BG 50

English

295BA086 KN

295BA083 KN

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)

carefully counterclockwise, no

further than stop, until the engine

runs smoothly and accelerates well.

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.

Spark Plug

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

Install a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded/corroded.

The 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 degrade performance.

Removing the Spark Plug

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

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 50

English

000BA039 KN

0000-GXX-1830-A0

Checking the spark plug

N Clean the spark plug if it is dirty N Check the electrode gap (A) and

readjust if necessary – see

"Specifications" N Use only resistor type spark plugs of

the approved range Correct the problems that have caused

fouling of the spark plug:

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

operating at part throttle.

Engine Running Behavior

If engine running behavior is unsatisfactory even though the air filter is clean and the carburetor is properly adjusted, the cause may be the muffler.

Have the muffler checked for contamination (carbonization) by your servicing dealer.

STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.

WARNING

To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press the spark plug boot (1) snugly onto the spark plug terminal (2).

Do not use a spark plug with a detachable SAE adapter terminal (3). Arcing may occur that could ignite combustible fumes and cause a fire. This can result in serious injuries or damage to property.

N Only use resistor type spark plugs

with solid, non-threaded terminals

Installing the spark plug

N Screw home the spark plug, fit the

boot and press it down firmly.

BG 50

+ 44 hidden pages

Stihl BG 50 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual