STIHL MM 55 C-E Instruction Manual

STIHL MM 55

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 - 31

Manual de instrucciones 32 - 67

Contents

English

MultiSystem 2 Guide to Using this Manual 2 Safety Precautions and Working

Techniques 3 Approved MultiTools 11 Adjusting the bicycle handle 11 Fuel 11 Fueling 12

Original Instruction ManualPrinted on chlorine-free paper

Starting / Stopping the Engine 13 Extra weight 15 Wheels 16 Operating Instructions 17 Replacing the Air Filter 17 Engine Management 18 Adjusting the Carburetor 18 Spark Plug 20 Engine Running Behavior 21 Rewind Starter 22 Storing the Machine 22 Inspections and Maintenance by

Dealer 23 Maintenance and Care 24

Printing inks contain vegetable oils, paper can be recycled.

Main Parts 25 Specifications 26 Special Accessories 27 Maintenance and Repairs 27 Disposal 28 STIHL Incorporated Federal

Emission Control Warranty Statement 28

Trademarks 30

Allow only persons who fully understand the manuals of the MultiEngine and the MultiTool to operate your power tool.

To receive maximum performance and satisfaction from your STIHL power tool, 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 power tool. 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 the two manuals.

WARNING

Because this MultiEngine is the engine for a high-speed power tool, some special safety precautions must be observed to reduce the risk of personal injury. Careless or improper use may cause serious or even fatal injury.

Make sure your unit is equipped with the proper deflector for the type of cutting attachment being used. Always wear proper eye protection.

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MM 55, MM 55 C

English

469BA028 KN

MultiSystem

In the STIHL MultiSystem, various MultiEngines and MultiTools are combined to form a machine. In this Instruction Manual, the functional unit of MultiEngine and MultiTool is referred to as a machine.

Accordingly, the instruction manuals for the MultiEngine and the MultiTool constitute the entire Instruction Manual for the machine.

Always read both manuals carefully before using your machine for the first time and keep them safe for future reference.

Guide to Using this Manual

Pictograms

All the pictograms attached to or embossed on the machine are shown and explained in this manual.

Symbols in Text

Many operating and safety instructions are supported by illustrations.

The individual steps or procedures described in the manual may be marked in different ways:

N A bullet marks a step or procedure. A description of a step or procedure that

refers directly to an illustration may contain item numbers that appear in the illustration. Example:

N Loosen the screw (1). N Lever (2) ...

In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols and signal words described below:

DANGER

Indicates an imminent risk of severe or fatal injury.

WARNING

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

NOTICE

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

Engineering Improvements

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

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Safety Precautions and Working Techniques

Because this MultiEngine is the engine for a highspeed power tool, 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 manuals and the safety precautions of your MultiEngine and MultiTool 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.

Use your power tool only for the applications described in the instruction manual of the MultiTool you are using.

WARNING

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

WARNING

Minors should never be allowed to use this power tool. Bystanders, especially children, and animals should not be allowed in the area where it is in use.

WARNING

To reduce the risk of injury to bystanders and damage to property, never let your power tool run unattended. When it is not in use (e.g. during a work break), shut it off and make sure that unauthorized persons do not use it.

Most of these safety precautions and warnings apply to the use of all STIHL power tools. Different models may have different parts and controls. See the appropriate section of your MultiEngine and MultiTool instruction manuals for a description of the controls and the function of the parts of your model.

Safe use of a power tool 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.

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

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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:

– Wear gloves and 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.

WARNING

Never operate your power tool unless wearing goggles or properly fitted protective glasses with adequate top and side protection complying with ANSI Z 87.1 (or your applicable national standard). To reduce the risk of injury to your face STIHL recommends that you also wear a face shield or face screen over your goggles or protective glasses.

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.

Good footing is very important. Wear sturdy boots with nonslip soles.

For further instructions on proper clothing see the safety precautions in the instruction manual of the MultiTool you are using.

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 MultiEngine 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.

THE USE OF THE POWER TOOL

Transporting the Power Tool

WARNING

Always switch off the engine and make sure the working tool has stopped before putting a power tool down. When transporting your power tool in a vehicle, properly secure it to prevent turnover, fuel spillage and damage to the power tool.

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001BA220 KN

Fuel Your STIHL power tool uses an oil-

gasoline mixture for fuel (see the chapter on "Fuel" of your instruction manual).

WARNING

Gasoline is an extremely flammable fuel. If spilled and ignited by a spark or other ignition source, it can cause fire and serious burn injury or property damage. Use extreme caution when handling gasoline or fuel mix. Do not smoke or bring any fire or flame near the fuel or the power tool. Note that combustible fuel vapor may escape from the fuel system.

Fueling Instructions

WARNING

Fuel your power tool in well-ventilated areas, outdoors. Always shut off the engine and allow it to cool before refueling. Gasoline vapor pressure may build up inside the fuel tank depending on the fuel used, the weather conditions and the tank venting system.

In order to reduce the risk of burns and other personal injury from escaping gas vapor and fumes, remove the fuel filler cap on your power tool carefully so as to allow any pressure build-up in the tank to release slowly. Never remove the fuel filler cap while the engine is running.

Select bare ground for fueling and move at least 10 feet (3 m) from the fueling spot before starting the engine. Wipe off any spilled fuel before starting your machine.

WARNING

Check for fuel leakage while refueling and during operation. If fuel leakage is found, do not start or run the engine until the leak is fixed and any spilled fuel has been wiped away. Take care not to get fuel on your clothing. If this happens, change your clothing immediately.

WARNING

In order to reduce the risk of fuel spillage and fire from an improperly tightened fuel cap, correctly position and tighten the fuel cap in the fuel tank opening.

Different models may be equipped with different fuel caps.

Toolless cap with grip

To do this with this STIHL cap, raise the grip on the top of the cap until it is upright at a 90° angle. Insert the cap in the fuel

tank opening with the raised positioning marks on the grip of the cap and on the fuel tank opening lining up. Using the grip, press the cap down firmly while turning it clockwise as far as it will go (approx. 1/4 turn).

Fold the grip flush with the top of the cap. Grip the cap and check for tightness. If the grip does not lie completely flush with the cap and the detent on the grip does not fit in the corresponding recess in the filler opening, or if the cap is loose in the filler opening, the cap is not properly seated and tightened and you must repeat the above steps.

Misaligned, damaged or broken cap N If the cap does not drop fully into the

opening when the positioning marks line up and/or if the cap does not tighten properly when twisted, the base of the cap may be prematurely rotated (in relation to the top) to the closed position. Such misalignment can result from handling, cleaning or an improper attempt at tightening.

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001BA227 KN

001BA226 KN

Left: Base of cap in closed posi-

tion (with open space)

Right: Base of cap correctly posi-

tioned for installation

N To return the cap to the open

position for installation, turn the cap (with the grip up) until it drops fully into the tank opening. Next, twist the cap counterclockwise as far as it will go (approx. 1/4 turn) – this will twist the base of the cap into the correct position. Then, twist the cap clockwise, closing it normally.

N If your cap still does not tighten

properly, it may be damaged or broken; immediately stop use of the unit and take it to your authorized STIHL dealer for repair.

Screw Cap

WARNING

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

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

Before Starting Before starting work, open up the bike

handle and lock it in position with the rotary knob. See chapter on "Adjusting the Bike Handle."

WARNING

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

WARNING

Check fuel system for leaks, especially the visible parts, e.g., filler cap, hose connections, manual fuel pump (only for power tools equipped with a manual fuel pump). Do not start the engine if there

are leaks or damage – risk of fire! Have the machine repaired by a servicing dealer before using it.

WARNING

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

Inspect for loose parts (nuts, screws, etc.) and for cracked, bent, warped or damaged working tools.

WARNING

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

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

WARNING

To reduce the risk of injury from a MultiTool rotating in the wrong direction, check that the position of the gearbox is correct and change it if necessary.

MM 55, MM 55 C

On metal tools (top illustration), position

469BA027 KN

5m (16ft)

the gearbox so that the shaft is below the drive tube.

Use for: – BF-MM cultivator blades with

pointed tines

– BK-MM cultivator blades with

curved tines

– FC-MM edger – RL-MM aerator – MF-MM dethatcher

On sweeping tools (bottom illustration), position the gearbox so that the shaft is above the drive tube.

Use for:

– KB-MM bristle brush – KW-MM STIHL PowerSweep

For tools used to cut grass, trim and prune, remove the gearbox.

Use for: – FS-MM brushcutter Check the instruction manual for the

MultiTool to ensure you are using the appropriate deflector for that MultiTool.

Starting Start the engine at least 10 feet (3 m)

from the fueling spot, outdoors only. For specific starting instructions, see the

appropriate section of your MultiEngine and MultiTool manuals.

Place the power tool on firm ground or other solid surface in an open area. Maintain good balance and secure footing.

English

WARNING

To reduce the risk of injury from loss of control, be absolutely sure that the working tool is clear of you and all other obstructions and objects, including the ground, because when the engine starts at starting-throttle, engine speed will be fast enough for the clutch to engage and move the working tool.

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.

WARNING

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

Stop the engine and working tool immediately if you are approached.

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WARNING

Always stand to one side of the unit to avoid the risk of injury from contact with the rotating working tool.

To reduce the risk of eye and other injury always wear proper eye protection (see section on "Proper Clothing") and ensure that bystanders are at least 16 feet (5 m) away. To reduce the risk of damage to property, also maintain this

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469BA045 KN

distance from such objects as vehicles or windows. Any coworkers who must be in the restricted area should also wear goggles or protective glasses.

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.

See also the safety precautions on Starting in the instruction manual of the MultiTool.

Important Adjustments

WARNING

To reduce the risk of personal injury from loss of control or contact with the running working tool, do not use a power tool with incorrect idle adjustment. At correct idle speed, the working tool should not move. For directions on how to adjust idle speed, see the appropriate section of your instruction manual.

If you cannot set the correct idle speed, have your STIHL dealer check your power tool and make proper adjustments and repairs.

During Operation Holding and Controlling the Power Tool

Always hold the unit firmly with both hands on the handles while you are working. Wrap your fingers and thumbs around the handles, keeping the handles cradled between your thumb and forefinger. Keep your hands in this position to have your power tool under control at all times.

WARNING

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

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 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.

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

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("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.

Operating Instructions

WARNING

Do not operate your power tool using the starting throttle lock, as you do not have control of the engine speed.

In the event of an emergency, switch off the engine immediately – move the slide control / stop switch to 0 or STOP.

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 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.

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.

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WARNING

Use only identical STIHL replacement parts for maintenance and repair. Use of non-STIHL parts may cause serious or fatal injury.

Strictly follow the maintenance and repair instructions in the appropriate section of your MultiEngine and MultiTool instruction manuals. Please refer to the maintenance charts respectively the maintenance notes in these manuals.

WARNING

Always stop the engine and make sure that the working tool is stopped before doing any maintenance or repair work or cleaning the power tool. Do not attempt any maintenance or repair work not described in your MultiEngine and MultiTool instruction manuals. Have such work performed by your STIHL servicing dealer only.

Wear gloves when handling or performing maintenance on any blade.

WARNING

Never repair damaged working tools by welding, straightening or modifying the shape. This may cause parts of the working tool to come off and result in serious or fatal injuries.

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 a detachable SAE adapter nut, it must be attached.) A loose connection between spark plug boot 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 ignition wire 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.

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

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 the instruction manual.

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9911BA000 KN

BF-MM

BK-MM

RL-MM

FC-MM

KB-MMKW-MM

MF-MM

FS-MM

469BA007 KN

Approved MultiTools

The following STIHL MultiTools may be mounted on the MultiEngine:

MultiTool Application BF-MM Pick tines BK-MM Bolo tines RL-MM Aerator FC-MM Edger FS-MM Clearing saw MF-MM Dethatcher KW-MM STIHL

PowerSweep

KB-MM Bristle brush

Adjusting the bicycle handle

N Loosen knob (1) N Fold out bicycle handle in working

position as far as it will go

N Tighten knob

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.

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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

English

232BA046 KN

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 rec ommend STI HL H P Ul tra 2-Cycl e 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.).

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.

Gasoline

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 equivalent high-quality oils)

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

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.

WARNING

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

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START

STOP

002BA036 KN

469BA033 KN

Starting / Stopping the Engine

Controls

1 Throttle trigger lockout 2 Throttle trigger 3 Slide control

Positions of slide control 4START – ignition is switched on –

5 F – normal run position – the engine

6STOP-0 – engine off – the ignition is

the engine can start

is running or can start

switched off

Symbol on slide control 7 h – stop symbol and arrow. To stop

the engine, push the slide control in the direction of the arrow on the stop symbol (h) to STOP-0.

Starting N Swing bike handle into working

position – see "Adjusting the Bike Handle"

N Press down the trigger lockout lever

and squeeze the throttle trigger

N and hold them in that position. N Move the slide control to START

and hold it there.

N Now release the throttle trigger,

slide control and trigger lockout in that order. This is the starting throttle position.

g if the engine is cold e for warm start – also use this posi-

tion if the engine has been running but is still cold.

N Press the manual fuel pump

bulb (9) at least five times – even if the bulb is filled with fuel.

Cranking N Retract the wheels, if fitted.

469BA061 AS

469BA062 AS

N Put the unit on the ground: It must

rest securely on the engine flange and the support on the frame. Check that the MultiTool is not touching the ground or any other

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N Set the choke lever (8) to

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469BA063 AS

469BA034 KN

obstacles – see also "Starting / Stopping the Engine" in the MultiTool instruction manual.

N Make sure you have secure footing

– as shown. To reduce the risk of injury from contact with rotating attachments, always stand to the side of the power tool.

N With your left hand on the carrying

handle, press the unit firmly against the ground.

NOTICE

Do not stand or kneel on the drive tube.

NOTICE

Do not pull out the starter rope all the way – it might otherwise break.

Version with Easy2Start N Pull the starter grip slowly until you

feel it engage and then pull it out slowly and steadily.

NOTICE

Do not pull out the starter rope all the way – it might otherwise break.

Both versions N Do not let the starter grip snap back.

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

N Continue cranking.

When engine begins to fire

WARNING

Make sure the carburetor is correctly adjusted. The working tool must not rotate when the engine is idling.

Stopping the Engine

N Push the slide control in direction of

arrow h – to STOP-0.

If engine does not start

Choke lever If you did not move the choke lever to e

quickly enough after the engine began to fire, the combustion chamber is flooded.

N Set the choke lever to e. N Set the slide control, trigger lockout

lever and throttle trigger to the starting throttle position.

N Start the engine by pulling the

starter rope briskly – 10 to 20 pulls may be necessary.

N Hold the starter grip with your right

hand.

Version without Easy2Start N Pull the starter grip slowly until you

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

N After no more than five pulls, move

the choke lever (8) to e.

N continue cranking.

As soon as the engine runs N Blip the throttle trigger – the engine

settles down to idle speed.

Your machine is now ready for operation.

If the engine still does not start

N Move the slide control to STOP-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 slide control to F.

MM 55, MM 55 C

English

469BA053 KN

469BA054 KN

N Set the choke lever to e – even if

the engine is cold.

N Now start the engine.

Fuel tank run until completely dry N After refueling, press the manual

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

N Set the choke lever to suit the

engine temperature.

N Now start the engine.

Extra weight

To increase the weight on the MultiTool, the MultiEngine can be retrofitted with an additional weight (special accessory).

Always use original STIHL additional weight. Using other weights can lead to damage to the machine and personal injuries.

Attaching additional weight

No wheels are attached to the MultiEngine

Use the combination wrench to loosen and tighten the weights.

Detach the weights on the side without the square – to do this:

N Push additional weight (1) with bolt

through the hole (6) in the flange; in the process, rotate it until the square (2) engages in the opening in the flange

N Turn the inner weight (5) onto the

bolt and tighten

N Fasten outer weight (4) with the

hexagon head bolt (3) in the thread of the inner weight and tighten

One or two weights can be mounted on each side of the additional weight as needed.

Weights on each side

1 4.4 lbs. (2 kg) 2 8.8 lbs. (4 kg)

Additional weight, total

MM 55, MM 55 C

NOTICE

The weights (1) on the side with the square (2) remain mounted on the bolt.

N Unscrew the hexagon head bolt (3)

and remove the outer weight (4)

N Detach the inner weight (5) and

remove it from the bolt

The maximum additional weight is

8.8 lbs. (4 kg). Never use higher additional weight. This can cause damage to the machine.

Wheels are attached to the MultiEngine If wheels (special accessory) – see

"Wheels" – are already attached to the MultiEngine, then additional parts are required in order to install the additional weight.

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469BA035 KN

In this case, have the additional weight installed by a servicing dealer.

STIHL recommends that maintenance and repair work be carried out only by authorized STIHL dealers.

Wheels

For convenient transport, the MultiEngine can be retrofitted with a set of wheels (special accessory).

Always use original STIHL wheels. Using other wheels can lead to damage to the machine and personal injuries.

Installing wheels

No additional weight is attached to the MultiEngine

To simplify installation, turn the machine so that it rests on the handles.

N Insert the bolt (2) with the

washer (3) through the hole (4) in the flange

N Fit the washer (3) and tighten it

down with the nut (5)

N Fasten the notched plate (6) to the

frame with the screws (7) in the threaded holes – in the process, push the notched plate toward the handle

N The wheels must fold down

automatically in working position; if necessary, loosen the nut (5) by a quarter turn

Additional weight is attached to the MultiEngine

If additional weight (special accessory) – see "Additional weight" – is already attached to the MultiEngine, then additional parts are required in order to install wheels.

In this case, have the wheels installed by a servicing dealer.

STIHL recommends that maintenance and repair work be carried out only by authorized STIHL dealers.

Folding the wheels in and out

The wheels can be locked in various positions.

If the wheels are not needed during

N Insert the two sleeves (1) in the

frame

N Push the frame onto the flange

work, fold in the wheels.

MM 55, MM 55 C

469BA036 KN

Operating Instructions Replacing the Air Filter

469BA037 KN

English

N Loosen knob (8) N Engage knob in the desired working

position and tighten it

During break-in period

A factory-new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessary high loads during the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the engine are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings.

During Operation

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

After Finishing Work

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

If there is a noticeable loss of engine power

N Set choke lever to g N Remove screw (1) N Remove filter cover (2) N Remove coarse dirt from inside the

filter cover and around the filter

MM 55, MM 55 C

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469BA038 KN

Engine Management Adjusting the Carburetor

N Remove the air filter (3) N Check the air filter – replace if

necessary

NOTICE

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

housing (4)

N Refit the filter cover and screw it

down

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 Mount the MultiTool. 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.

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

MM 55, MM 55 C

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469BA057 KN

469BA058 KN

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 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

MM 55, MM 55 C

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

3 minutes.

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469BA059 KN

232BA081 KN

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

clockwise until the engine runs smoothly – the cutting/working attachment must not rotate.

Cutting/working attachment runs when engine is idling

N Turn the idle speed screw (LA)

counterclockwise until the cutting/working attachment stops moving and then turn the screw another 1/2 to 1 full turn in the same direction.

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.

Erratic idling behavior Idle setting is too rich N 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 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.

Spark Plug

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

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

Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation.

Remove the spark plug

N Move the slide control to STOP-0

N Unplug spark plug boot (1) N Unscrew spark plug

WARNING

If the cutting/working attachment continues to run when the engine is idling, have your machine checked and repaired by your servicing dealer.

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.

MM 55, MM 55 C

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