STIHL BG 55, 65, 85, SH 55, 85 - Handheld Blower Manual

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

• 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:
• Loosen the screw (1).
• Lever (2)...
  In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols and signal words described below:

Indicates an imminent risk of severe or fatal injury.

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 the use of any blower may be dangerous, 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.

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.

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.
Do not use it for other purposes, since misuse may result in personal injury or property damage, including damage to the machine.

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.

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.

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.

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.

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.

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

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

	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.

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.

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

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).

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

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.

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.

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

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.

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.

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.

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.

Starting

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

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.

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

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 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.

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.
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.

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 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.

As soon as the engine is running, this product generates toxic exhaust fumes containing chemicals, such as unburned hydrocarbons (including benzene) and carbon monoxide, that are known to cause respiratory problems, cancer, birth defects, or other reproductive harm. Some of the gases (e.g. carbon monoxide) may be colorless and odorless. To reduce the risk of serious or fatal injury / illness from inhaling toxic fumes, never run the machine indoors or in poorly ventilated locations.

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.

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.

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.

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

In the event of an emergency, switch off the engine immediately – move the stop switch to 0.

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.

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.

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.

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.

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.

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.

Some STIHL power tools are equipped with a catalytic 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 conventional mufflers when the engine returns to idle or is shut off. To reduce the risk of fire and burn injuries 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 combustible materials 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.

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.

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.

To reduce the risk of personal injury from fire and explosion, never attempt to vacuum hot or burning substances (e.g. smoldering ashes, glowing cigarettes) or combustible fluids (e.g. gasoline, paint thinners).

Vacuuming unsuitable materials may block the fanwheel. Switch off the unit immediately. Then clear the blockage.
Take particular care when vacuuming wet leaves since they may block the blower wheel and elbow.

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.

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

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.

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.

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.

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.

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.

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!

• 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

• Use a suitable tool to lift the tab (6) on the fan housing stub (3).
• 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

• From inside the catcher bag (2), push the elbow (1) through the intake opening and pull it outwards until it is firmly seated.
  
• Attach the carrying strap.

• Push the elbow (1) into the catcher bag (2) as far as the mark and secure it with the Velcro strip (3).
  

• Loosen the screw (4).
  

• Push the elbow (1) with lug (5) into the fan housing stub (6) and rotate it in the direction of the arrow to lock in position.
  
• Tighten down the screw (4) firmly.
• Use a suitable tool to disengage the tab (7) on the intake screen (8) and then open the intake screen.
  

• Push guideways (9) on suction tube (10) onto lugs (11) on fan housing and
  
• rotate suction tube in direction of arrow to lock it in position.

Removing the Elbow

• Loosen the screw (4).
  

• Use a suitable tool to lift the tab (7)
• on the fan housing stub (6).
• Rotate the elbow in the direction of the arrow and then pull it out.
• 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 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.

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.).

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
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.

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.

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.

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.

Starting / Stopping the Engine

Starting the Engine

• N Observe safety precautions.
• BG 55, 65, SH 55
• Move the stop switch (1) to the run position I.
• Squeeze the throttle trigger (2) and press in the lockout button (3) at the same time.
• Release the throttle trigger.
• 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

• Move the stop switch (1) to the run position I.
• Squeeze the throttle trigger (2) and move the setting lever (4) to midway position at the same time.
• 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

• Press the manual fuel pump bulb (6) at least five times – even if the bulb is filled with fuel.
  

If the engine is cold

• Set the choke lever (5) to .
• Pull the starter rope five times.
• Set the choke lever (5) to .
• Continue cranking until the engine runs.

If the engine is warm

• Set the choke lever (5) to .
  Also use this setting if the engine has been running but is still cold.

Cranking

• Place the unit on the ground so that it is secure.
• Make sure you have a firm footing: Hold the unit firmly with your left hand on the housing and press down.
• Hold the starter grip with your right hand.
• 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.

• 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 Engine Runs
BG 55, 65, SH 55

• Blip the throttle trigger so that the lockout button pops out – the engine settles down to idle speed.

BG 85, SH 85

• Move the setting level forwards to end position.

Stopping the Engine

• Move the stop switch to 0.

Other Hints on Starting
If the engine stops during warm-up or acceleration

• Repeat the starting procedure – see "If the engine is cold".

If the engine does not start

• Make sure all settings are correct (choke shutter, throttle trigger in starting throttle position, stop switch to I).
• Repeat the starting procedure.

If the engine still does not start

• Move the stop switch to 0.
• Remove the spark plug – see "Spark Plug".

• Dry the spark plug.
• Crank the engine several times with the starter to clear the combustion chamber.
• Refit the spark plug – see "Spark Plug".
• Move the stop switch to I.
• Set the choke lever to – even if the engine is cold.
• Now start the engine.

If fuel tank has been run completely dry and then refueled

• Press the manual fuel pump bulb (6) at least five times – even if the bulb is filled with fuel.
  
• Set the choke lever according to engine temperature.
• Start the engine.

Cleaning the Air Filter

If there is a noticeable loss of engine power

• Move the choke lever to
• Squeeze the tabs (1) together.
• Swing the filter cover (2) open and take it away.
• Clean away loose dirt from around the filter.
• Take the filter (3) out of the filter housing (4).
  
• 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.

• Fit the filter (3) in the filter housing (4).
• Fit the filter cover (2) so that it snaps into position.

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.

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

• Shut off the engine.
• Check the air filter and clean or replace if necessary.
• Check the spark arresting screen (not in all models, country-specific) in the muffler and clean or replace if necessary.

Standard Setting

• Turn high speed screw (H) counterclockwise as far as stop (no more than 3/4 turn).
• Turn the low speed screw (L) clockwise as far as stop, then turn it back 3/4 turn.

Adjusting Idle Speed

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

Engine stops while idling

• 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

• Turn the low speed screw (L) carefully counterclockwise, no further than stop, until the engine runs smoothly and accelerates well.

Erratic idling behavior, engine speed drops when swinging the machine
Idle setting is too rich

• Turn the low speed screw (L) slowly clockwise 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:

• Carry out the standard setting.
• Warm up the engine.
• 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.

Catalytic Converter

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.

Checking the Spark Plug

• Clean dirty spark plug.
• Check electrode gap (A) and readjust if necessary – see "Specifications."
• Use only resistor type spark plugs of the approved range.

Rectify problems 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.

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

• Screw home the spark plug, fit the boot and press it down firmly.

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.

Rewind Starter

To help prolong the wear life of the starter rope, observe the following points:

• Pull the starter rope only in the direction specified.
• Do not pull the rope over the edge of the guide bushing.
• Do not pull out the rope more than specified.
• Do not allow the starter grip to snap back, guide it back into the housing slowly – see chapter on "Starting / Stopping the Engine."

Have a damaged starter rope replaced by your dealer before it breaks completely. STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.

Storing the Machine

For periods of 3 months or longer

• Drain and clean the fuel tank in a well ventilated area.
• Dispose of fuel properly in accordance with local environmental requirements.
• Run the engine until the carburetor is dry – this helps prevent the carburetor diaphragms sticking together.
• Thoroughly clean the machine – pay special attention to the cylinder fins and air filter.
• Store the machine in a dry, high or locked location, – out of the reach of children and other unauthorized persons.

Inspections and Maintenance by Dealer

Spark arresting screen in muffler

• If the engine is down on power, check the spark arresting screen in the muffler.

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

Maintenance and Care

The following intervals apply to normal operating conditions only. If your daily work - ing time is longer or operating conditions are difficult (very dusty work area, etc.), shorten the specified intervals accordingly.		before starting work	after finishing work or daily	after each refueling stop	weekly	monthly	every 12 months	if problem	if damaged	as required
Complete machine	Visual inspection (condition, wear, leaks)
	Clean
Control handle	Check operation
Air filter	Clean
	Replace
Manual fuel pump (if fitted)	Check
	Have repaired by servicing dealer 1)
Filter in fuel tank	Check
	Replace filter
Fuel tank	Clean
Carburetor	Check idle setting
	Readjust idle
Spark plug	Readjust electrode gap
	Replace after 100 operating hours
Spark arrestor in muffler Cooling inlets	Check
	Have replaced by dealer1)
	Clean
All accessible screws and nuts (not adjust - ing screws)	Retighten
Safety labels	Replace

¹⁾STIHL recommends a STIHL servicing dealer.

Main Parts

Definitions

1. Tab Designed to secure the blower tube to the machine.
2. Setting Lever
   Holds the throttle trigger in position.
3. Spark Plug Boot
   Connects the spark plug to the ignition lead.

4. Muffler
   Reduces engine exhaust noises and diverts exhaust gases away from operator.
5. Starter
   Grip The grip of the pull starter, for starting the engine.
6. Carburetor Adjusting
   Screws For tuning the carburetor.
7. Choke Lever
   Eases engine starting by enriching mixture.
8. Manual Fuel
   Pump Provides additional fuel feed for a cold start.
9. Filter Housing
   Covers and protects the air filter element.
10. Fuel Filler Cap
    For closing the fuel tank.
11. Fuel Tank
    For fuel and oil mixture.
12. Assist Handle
    Additional handle for use with the suction tube as a vacuum and held by the left hand.
13. Control Handle
    The handle of the blower held by the right hand.
14. Switch
    To switch the machine in position ON and OFF.
15. Throttle
    Trigger Controls the speed of the engine.

16. Intake Screen
    Fits over intake opening and reduces the risk of direct contact with the fan wheel, which is located under the screen.
17. Blower
    Tube Directs the airstream.
18. Round Nozzle
    To be mounted on the blower tube to direct the airstream.
19. Fan Nozzle
    Alternative nozzle for the blower tube to accelerate the airstream.

20. Suction Tube *
21. Elbow *
22. Catcher Bag *

* Depending on Model – Special Accessory

Definitions

20. Suction Tube
    To direct vacuumed debris into catcher bag.
21. Elbow
    Directs airstream and debris into the catcher bag.
22. Catcher Bag
    Mounts to elbow to collect the vacuumed debris.

Specifications

EPA / CEPA
The Emission Compliance Period referred to on the Emissions Compliance Label indicates the number of operating hours for which the engine has been shown to meet Federal emission requirements.
Category

1. 300 hours
2. 125 hours
3. 50 hours

CARB
The Emission Compliance Period used on the CARB-Air Index Label indicates the terms:
Extended = 300 hours
Intermediate = 125 hours
Moderate = 50 hours

Engine
Single cylinder two-stroke engine

Ignition System
Electronic magneto ignition
Spark plug (resistor type): NGK BPMR 7 A, Bosch WSR 6 F
Electrode gap: 0.02 in (0.5 mm)

Fuel System
All position diaphragm carburetor with integral fuel pump
Fuel tank capacity: 13.5 fl.oz (0.4 l)

Maximum air flow rate

Air velocity with nozzle

Weight

Maintenance and Repairs

Users of this unit should carry out only the maintenance operations described in this manual. STIHL recommends that other repair work be performed only by authorized STIHL servicing dealers.
Warranty claims following repairs can be accepted only if the repair has been performed by an authorized STIHL servicing dealer using genuine STIHL replacement parts.
Genuine STIHL parts can be identified by the STIHL part number, the logo and, in some cases, by the STIHL parts symbol . The symbol may appear alone on small parts.