Stihl MM 56 Manual

Introduction

In the STIHL MultiSystem a number of different MultiEngines and MultiTools can be combined to produce a power tool. In this instruction manual the functional unit formed by the MultiEngine and MultiTool is referred to as the power tool.

Therefore, the separate instruction manuals for the MultiEngine and MultiTool should be used together for the power tool.
Always read and and make sure you understand both instruction manuals before using your power tool for the first time and keep them in a safe place for future reference.

Guide to Using this Manual

Pictograms

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

Symbols in text

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

Special safety precautions must be observed when operating a power tool.

Always read and and make sure you understand both user manuals (MultiEngine and MultiTool) before using your power tool for the first time and keep them in a safe place for future reference. Non-compliance with the user manuals may cause serious or even fatal injury.

Observe all applicable local safety regulations, e.g. by trade organizations, social insurance institutions, labor safety authorities etc.
If you have never used a power tool before: Have your dealer or other experienced user show you how to operate your machine – or attend a special course to learn how to operate it.
Minors should never be allowed to use the machine – except for apprentices over the age of 16 when working under supervision.
Children, animals and bystanders must remain at a distance.
When not using the machine, it must be laid down in such a way that it does not endanger anyone. Ensure that the machine cannot be used without authorization.
The user is responsible for accidents or risks involving third parties or their property.

Lend or rent your power tool only to persons who are familiar with this model and its operation – do not lend of rent your power tool without the MultiEngine and MultiTool user manuals.
The use of noise emitting power tools may be restricted to certain times by national or local regulations.
Anyone operating the machine must be well rested, in good physical health and in good mental condition.
If you have any condition that might be aggravated by strenuous work, check with your doctor before operating a machine.

Persons with pacemakers only: The ignition system of your power tool produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. STIHL recommends that persons with pacemakers consult their physician and the pacemaker manufacturer to reduce any health risk.
Anyone who has consumed alcohol or drugs or medicines affecting their ability to react must not operate a power tool.
Use your power tool only for the applications described in the user manual of the MultiTool you are using.
The machine must not be used for any other purposes – risk of accidents!
Do not operate the MultiEngine without a properly mounted MultiTool since this may result in damage to the machine.

Only use MultiTools and accessories that are explicitly approved for this power tool by STIHL or are technically identical. It is important that you read the chapter on "Approved MultiTools". If you have any questions in this respect, consult your dealer. Use only high quality parts and accessories. in order to avoid the risk of accidents and damage to the machine.

STIHL recommends the use of original STIHL tools and accessories. They are specifically designed to match the product and meet your performance requirements.
Never attempt to modify your power tool in any way since this may increase the risk of personal injury. STIHL excludes all liability for personal injury and damage to property caused while using unauthorized attachments.
Do not use a high-pressure washer to clean the power tool. The solid jet of water may damage parts of the unit.

Clothing and equipment

Wear proper protective clothing and equipment.
Do not wear clothing which could become trapped in wood, brush or moving parts of the machine. Do not wear a scarf, necktie or jewelry. Tie up and confine long hair above your shoulders.

Wear steel-toed safety boots with non-slip soles.

To reduce the risk of eye injuries, wear close-fitting safety glasses in accordance with European Standard EN 166. Make sure the safety glasses are a snug fit.

Wear "personal" sound protection, e.g. ear defenders.
Wear face protection and make sure it is a good fit. Face protection alone is not sufficient to protect the eyes.
See also notes on "Clothing and Equipment" in the user manual of the MultiTool you are using.

Transporting the machine

Always stop the engine.
Transport the machine by the handle or loop handle, working tool facing forward.

Never touch hot parts – risk of burns!

The power tool can turn over or move while being transported. Persons may be injured or property damaged. Secure the power tool with lashing straps or a net to prevent it turning over and moving. Allow the power tool to cool down before transporting it by vehicle. Position the power tool so that no fuel can escape.
See also notes on "Transporting the Power Tool" in the user manual of the MultiTool you are using.

Refueling

Gasoline is highly flammable – keep away from fire or flame – do not spill any fuel – no smoking.

Always shut off the engine before refueling.

Do not fuel a hot engine – fuel may spill and cause a fire.

Open the fuel cap carefully to allow any pressure build-up in the tank to release slowly and avoid fuel spillage.
Only refuel the machine in a well ventilated place. If fuel has been spilled, immediately clean the machine – do not allow your clothes to be splashed with fuel. If that happens, change your clothes at once.

After fueling, tighten down the screw-type fuel cap as securely as possible.

This helps reduce the risk of engine vibrations causing an incorrectly tightened fuel cap to loosen or come off and spill fuel.

Check for fuel leakage! Never start the engine if fuel has been spilled or is leaking – Fatal burns may result!

Before starting

Check that your power tool is properly assembled and in good condition – refer to appropriate chapters in the User Manuals:

• Check the fuel system for leaks, especially the visible parts, e. g., fuel cap, hose connections, manual fuel pump (only in machines with a manual fuel pump). In case of leakage and damage, do not start the engine – risk of fire! Have the machine serviced by a dealer before using it
• Use only an approved combination of attachment and deflector. All parts must be assembled properly and securely.
• The stop switch must be easy to push
• Smooth action of throttle trigger lockout and throttle trigger – the throttle trigger must return automatically to the idle position
• Check that the spark plug boot is secure – a loose boot may cause arcing that could ignite combustible fumes and cause a fire.
• Do not make any changes to the controls or the safety devices
• Keep the handles dry and clean – free from oil and dirt – for safe control of the power tool.
• Swing the bike handle to the normal operating position and tighten it down firmly with the rotary knob. See "Adjusting the Bike Handle".

To reduce the risk of personal injury, do not operate your power tool if it is damaged or not properly assembled!
See also notes on "Before Starting" in the user manual of the MultiTool you are using.
Check the position of the gearbox for the MultiTool you have mounted and correct it if necessary. This helps reduce the risk of injury from the MultiTool rotating in the wrong direction.
See "Mounting the MultiTool" in the user manual of the MultiTool you are using.

If you use metal tools, position the gearbox so that the axle is below the drive shaft.

Use this position for:

• BF-MM cultivator
• BK-MM bolo tines
• FC-MM edger
• RL-MM aerator
• MF-MM dethatcher

If you use sweeping attachments, position the gearbox so that the axle is above the drive shaft.

Use this position for:

• KB-MM bristle brush
• KW-MM sweeper drum assembly

Starting the engine

Start the engine at least 3 meters from the fueling spot, outdoors only.
Place the power tool on firm ground in an open area. Make sure you have good balance and secure footing. Hold the power tool securely. The attachment must be clear of the ground and all other obstructions because it may begin to run when the engine starts.
Your power tool is for operation by one person only. To reduce the risk of injury from contact with the rotating tool, do not allow other persons within a radius of 5 meters of your own position – even when starting.

The tool begins to rotate as soon as the engine is started in the "Start" position. Always stand to one side of the machine when starting – never in front of the tools. To reduce the risk of injury, avoid contact with the working tool.

Do not drop-start the power tool – start the engine as described in the User Manual. Note that the attachment continues to run for a short period after you let go of the throttle trigger – flywheel effect.
Check idle speed setting: The attachment must be stationary when the engine is idling with the throttle trigger released.
Keep easily combustible materials (e. g., wood chips, bark, dry grass, fuel) away from hot exhaust gases and hot muffler surfaces – risk of fire!
See also notes on "Starting / Stopping the Engine" in the user manual of the MultiTool you are using.

Holding and Controlling the Power Tool

Make sure you always have good balance and secure footing.
Always hold the unit firmly with both hands on the handles.
Right hand on control handle, left hand on grip on handlebar.

While working

In the event of impending danger or in an emergency, switch off the engine immediately by pressing the stop switch.

To reduce the risk of injury from contact with the tool and ejected objects, do not allow any other persons within a radius of 5 meters of your own position. This distance must also be maintained in relation to objects (vehicles, window panes) – risk of property damage!

The correct engine idle speed is important to ensure that the attachment stops moving when you let go of the throttle trigger. If the working tool continues to move when the engine is idling, have your dealer check the machine and make proper adjustments or repairs. Check and correct the idle speed setting at regular intervals. STIHL recommends you have this work done by a STIHL servicing dealer.
Do not operate your power tool in the starting throttle position – engine speed cannot be controlled in this position.
Be particularly alert and cautious when wearing hearing protection because your ability to hear warnings (shouts, alarms, etc.) is restricted.
Take breaks when you start getting tired or feeling fatigue – risk of accidents!
Work calmly and carefully – in daylight conditions and only when visibility is good. Proceed with caution, do not put others in danger.
Use your power tool only for those applications described in the MultiTool user manual.

As soon as the engine is running, the power machine generates toxic exhaust gas. These gases may be odorless and invisible and may contain unburned hydrocarbons and benzene. Never run the engine indoors or in poorly ventilated locations, even if your model is equipped with a catalytic converter.

To reduce the risk of serious or fatal injury from breathing toxic fumes, ensure proper ventilation when working in trenches, hollows or other confined locations.
Stop work immediately if you start suffering from nausea, headaches, impaired vision (e.g. your field of vision gets smaller), impaired hearing, dizziness, or impaired concentration – these symptoms may possibly be the result of too-high exhaust gas concentration – Risk of accidents!
Operate your power tool so that it produces a minimum of noise and emissions – do not run the engine unnecessarily, accelerate the engine only when working.
To reduce the risk of fire, do not smoke while operating or standing near your power tool. Combustible fuel vapor may escape from the fuel system.
Dust, fumes and smoke produced while working may be hazardous to health! Wear respiratory protection in case of heavy dust or smoke emission.
Never touch hot parts – risk of burns!

Keep your hands and feet well away from the working tool. To reduce the risk of injury, never touch a rotating tool. Always stand behind the deflector or to one side of the machine during operation – never in front of the rotating tools.

If your power 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 – see also "Before Starting". Check in particular that the fuel system has no leaks and the safety equipment is fully operative.
Never use a power tool that is no longer safe to operate. In case of doubt, contact a dealer.
To reduce the risk of injury, shut off the engine before changing the attachment.
After finishing work or before leaving the power tool unattended: Shut off the engine.
See also notes on "During Operation" in the user manual of the MultiTool you are using.

Vibrations

Prolonged use of the power tool may result in vibration-induced circulation problems in the hands (whitefinger disease).
No general recommendation can be given for the length of usage because it depends on several factors.

The period of usage is prolonged by:

• Hand protection (wearing warm gloves)
• Work breaks

The period of usage is shortened by:

• Any personal tendency to suffer from poor circulation (symptoms: frequently cold fingers, tingling sensations).
• Low outside temperatures.
• The force with which the handles are held (a tight grip restricts circulation).

Continual and regular users should monitor closely the condition of their hands and fingers. If any of the above symptoms appear (e.g. tingling sensation in fingers), seek medical advice.

Maintenance and Repairs

Service the machine regularly. Do not attempt any maintenance or repair work not described in the instruction manual. Have all other work performed by a servicing dealer.
STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.
Only use high-quality replacement parts in order to avoid the risk of accidents and damage to the machine. If you have any questions in this respect, consult a servicing dealer.
STIHL recommends the use of genuine STIHL replacement parts. These parts are specifically designed to match your machine model and meet your performance requirements.
To reduce the risk of injury from unintentional engine startup, always shut off the engine and disconnect the spark plug boot before performing any repairs, maintenance or cleaning work. – Exception: Carburetor and idle speed adjustments.
Do not turn the engine over on the starter with the spark plug boot or spark plug removed since there is otherwise a risk of fire from uncontained sparking.
To reduce the risk of fire, do not service or store your machine near open flames.
Check the fuel filler cap for leaks at regular intervals.
Use only a spark plug of the type approved by STIHL and make sure it is in good condition – see "Specifications".
Inspect the ignition lead (insulation in good condition, secure connection).
Check the condition of the muffler.
To reduce the risk of fire and damage to hearing, do not operate your machine if the muffler is damaged or missing.
Do not touch a hot muffler since burn injury will result.

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
MF-MM	Dethatcher
KW-MM	PowerSweep
KB-MM	Bristle brush

Adjusting the bicycle handle

• Loosen the knob (1).
• Swing the bicycle handle with both hands into the working position (as far as stop).
• Tighten down the knob firmly.

Fuel

Your engine requires a mixture of gasoline and engine oil.

For health reasons, avoid direct skin contact with gasoline and avoid inhaling gasoline vapor.

STIHL MotoMix

STIHL recommends the use of STIHL MotoMix. This ready-to-use fuel mix contains no benzol or lead, has a high octane rating and ensures that you always use the right mix ratio.
STIHL MotoMix uses STIHL HP Ultra two-stroke engine oil for an extra long engine life.
MotoMix is not available in all markets.

Mixing Fuel

NOTICE
Unsuitable fuels or lubricants or mix ratios other than those specified may result in serious damage to the engine. Poor quality gasoline or engine oil may damage the engine, sealing rings, hoses and the fuel tank.

Gasoline
Use only high-quality brand-name gasoline with a minimum octane rating of 90 – leaded or unleaded.
Gasoline with an ethanol content of more than 10% can cause running problems in engines with a manually adjustable carburetor and should not be used in such engines.
Engines equipped with M-Tronic deliver full power when run on gasoline with an ethanol content of up to 25% (E25).

Engine Oil
If you mix the fuel yourself, use only STIHL two-stroke engine oil or another high-performance engine oil in accordance with JASO FB, JASO FC, JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-L-EGD.
STIHL specifies STIHL HP Ultra twostroke engine oil or an equivalent highperformance engine oil in order to maintain emission limits over the machine's service life.

Mix Ratio
STIHL 50:1 two-stroke engine oil: 50 parts gasoline to 1 part oil

Examples
Gasoline	STIHL engine oil 50:1
Liters	Liters	(ml)
1	0.02	(20)
5	0.10	(100)
10	0.20	(200)
15	0.30	(300)
20	0.40	(400)
25	0.50	(500)

• Use a canister approved for storing fuel. Pour oil into canister first, then add gasoline and mix thoroughly.

Storing Fuel

Store fuel only in approved safety-type fuel canisters in a dry, cool and safe location protected from light and the sun.

Fuel mix ages – only mix sufficient fuel for a few weeks work. Do not store fuel mix for longer than 30 days. Exposure to light, the sun, low or high temperatures can quickly make the fuel mix unusable.
STIHL MotoMix may be stored for up to 2 years without any problems.

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

Pressure may build up in the canister – open it carefully.

• Clean the fuel tank and canister from time to time.

Dispose of remaining fuel and cleaning fluid properly in accordance with local regulations and environmental requirements.

Fueling

Preparations

• Before fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank.
• Position the machine so that the filler cap is facing up.

Opening screw-type tank cap

• Turn the cap counterclockwise until it can be removed from the tank opening.
  
• Remove the cap.

Filling up with fuel

Take care not to spill fuel while fueling and do not overfill the tank. STIHL recommends you use the STIHL filler nozzle (special accessory).

Closing screw-type tank cap

• Place the cap in the opening.
• Turn the cap clockwise as far as stop and tighten it down as firmly as possible by hand.
  

Starting / Stopping the Engine

Controls

1. Throttle trigger lockout
2. Throttle trigger
3. Stop switch with Run and Stop positions. Depress the stop switch ( ) to switch off the ignition – see "Function of Stop Switch and Ignition System".

Function of Stop Switch and Ignition System
The ignition is switched off and the engine stopped when the stop switch is depressed. The stop switch returns automatically to the Run position when it is released: The ignition is switched on again after the engine stops – the engine is then ready to start.

Starting the Engine

• Swing bicycle handle into working position – see "Adjusting the Bicycle Handle"
• Depress the manual fuel pump bulb (4) at least five times – even if the bulb is filled with fuel.
  

Cold engine (cold start)

• Depress the choke knob (5) and turn it to at the same time.
  

Warm engine (warm start)

• Depress in the choke knob (5) and turn it to at the same time.
  

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

Cranking

• Retract the wheels, if fitted.
• 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 obstacles – see also "Starting / Stopping the Engine" in the MultiTool instruction manual.
  
• 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.
• With your left hand on the carrying handle, press the unit firmly against the ground.

NOTICE
Do not stand or kneel on the shaft.

• 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.
• Continue cranking until the engine runs.

As soon as the engine runs

• Press down the throttle trigger lockout and open the throttle – the choke knob moves to the run position I. After a cold start, warm up the engine by opening the throttle several times.
  

Make sure the carburetor is correctly adjusted. The MultiTool must not rotate when the engine is idling.
Your machine is now ready for operation.

Stopping the Engine

• Depress the momentary contact stop switch – the engine stops – release the stop switch – it springs back to the run position.

Other Hints on Starting

Engine stalls in cold start position or under acceleration.

• Move the choke knob to and continue cranking until the engine runs.

Engine does not start in warm start position

• Move the choke knob to and continue cranking until the engine runs.

If the engine does not start

• Check that all settings are correct.
• Check that there is fuel in the tank and refuel if necessary.
• Check that the spark plug boot is properly connected.
• Repeat the starting procedure.

Engine is flooded

• Move the choke knob to I and continue cranking until the engine runs.

Fuel tank run until completely dry

• After refueling, depress the manual fuel pump bulb at least five times – even if the bulb is already filled with fuel.
• Set the choke knob to suit the engine temperature.
• Now start the engine.

Mounting the extra weight

An extra weight (special accessory) may be retrofitted on the MultiEngine to increase the weight on the MultiTool.
Use only original STIHL weights. The use of other weights parts may result in damage to the machine or personal injury.

MultiEngine without wheels
Use the combination wrench to unscrew and retighten the weights.
Unscrew weights on the side without square end – as follows:

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

• Take out the hex head screw (3) and remove the outer weight (4).
• Loosen the inner weight (5) and remove it from the bolt.

• Push the extra weight (1) with bolt through the bore (6) in the flange, turning it until the square end (2) engages the recess in the flange.
• Screw the inner weight (5) onto the bolt and tighten it down firmly.
• Screw the outer weight (4) with the hex head screw (3) into the thread of the inner weight and tighten it down firmly.

One of two weights may be mounted on each side of the extra weight as required.

Weight on each side	Total extra weight
1	2 kg
2	4 kg

NOTICE
The maximum allowable extra weight is 4 kg. Never use a heavier extra weight as this may damage the machine.

MultiEngine with wheels
If the MultiEngine is already equipped with wheels (special accessory), see chapter on "Wheels", additional parts are required to mount the extra weights.
In such a case have the extra weight mounted by your servicing dealer.
STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.

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.

• Insert the two sleeves (1) in the frame
• Push the frame onto the flange
• Insert the bolt (2) with the washer (3) through the hole (4) in the flange
• Fit the washer (3) and tighten it down with the nut (5)
• 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
• 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 work, fold in the wheels.

• Loosen knob (8)
• Engage knob in the desired working position and tighten it

Operating Instructions

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".

Replacing the Air Filter

If There is a Noticeable Loss of Engine Power

• Move the choke lever (1) to .
• Loosen the screws (2). N Remove the filter cover (3).
• Clean away loose dirt from around the filter.
• Remove the filter element (4).
• Replace dirty or damaged filter element (4).

Replacing the filter element

• Install the filter element (4) in the filter housing (5) and fit the cover.
• Insert the screws (2) and tighten them down firmly.

Adjusting the Carburetor

The carburetor has been set at the factory to provide an optimum fuel-air mixture under most operating conditions.

Adjusting Idle Speed
Engine stops while idling

• Warm up the engine for about 3 minutes.
• Turn the idle speed screw (LA) slowly clockwise until the engine runs smoothly – the MultiTool must not run.

MultiTool runs when the engine is idling

• Turn the idle speed screw (LA) counterclockwise until the MultiTool stops moving and then turn the screw about another 1/2 to 3/4 turn in the same direction.

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

Spark Arresting Screen in Muffler

To reduce the risk of fire caused by hot particles escaping from the machine, never operate the machine without a spark arresting screen, or with the spark arresting screen damaged. Do not modify the muffler or spark arresting screen.

NOTICE
According to the law or regulations in some countries or federal states, certain operations may only be carried out if a properly serviced spark arresting screen is provided.

• If the engine is down on power, check the spark arresting screen in the muffler.
• Wait for the muffler to cool down
• Use the combination wrench to unscrew the connector
  
• Clean the spark arresting screen. If the screen is damaged or heavily carbonized, fit a new one
• Insert the connector and tighten it down firmly with the combination wrench

Spark Plug

• If the engine is down on power, difficult to start or runs poorly at idle speed, first check the spark plug.
• Fit a new spark plug after about 100 operating hours – or sooner if the electrodes are badly eroded. Install only suppressed spark plugs of the type approved by STIHL – see "Specifications".

Removing the Spark Plug

• Shut off the engine.

The spark plug boot (2) is under the cap (1).

The cap (1) protects the spark plug boot from damage. Do not operate the machine without a cap – replace a damaged cap.

• Remove the cap (1).
• Pull off the spark plug boot (2).
• Allow the spark plug (3) to cool down.
• Unscrew the spark plug (3).

Checking the Spark Plug

• Clean dirty spark plug.
• Check electrode gap (A) and readjust if necessary – see "Specifications".
• Rectify the problems which have caused fouling of the spark plug.

Possible causes are:

• Too much oil in fuel mix.
• Dirty air filter.
• Unfavorable running conditions.

Arcing may occur if the adapter nut (1) is loose or missing. Working in an easily combustible or explosive atmosphere may cause a fire or an explosion. This can result result in serious injuries or damage to property.

• Use resistor type spark plugs with a properly tightened adapter nut.

Installing the spark plug

• Screw the spark plug into the cylinder.
• Press the boot firmly onto the spark plug.
• Push the cap (1) on to the spark plug boot as far as stop.
  

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.

Storing the Machine

For periods of about 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.
• Remove, clean and inspect the attachment.
• Store the machine in a dry and secure location Keep out of the reach of children and other unauthorized persons.

Fold the handle down and hang up the machine by the handle support.

Maintenance and Care

¹⁾ STIHL recommends STIHL dealers

Minimize Wear and Avoid Damage

Observing the instructions in this manual helps reduce the risk of unnecessary wear and damage to the power tool.
The power tool must be operated, maintained and stored with the due care and attention described in this owner's manual.
The user is responsible for all damage caused by non-observance of the safety precautions, operating and maintenance instructions in this manual. This includes in particular:

• Alterations or modifications to the product not approved by STIHL.
• Using tools or accessories which are neither approved or suitable for the product or are of a poor quality.
• Using the product for purposes for which it was not designed.
• Using the product for sports or competitive events.
• Consequential damage caused by continuing to use the product with defective components.

Maintenance Work

All the operations described in the "Maintenance Chart" must be performed on a regular basis. If these maintenance operations cannot be performed by the owner, they should be performed by a servicing dealer.
STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.
If these maintenance operations are not carried out as specified, the user assumes responsibility for any damage that may occur. Among other parts, this includes:

• Damage to the engine due to neglect or deficient maintenance (e.g. air and fuel filters), incorrect carburetor adjustment or inadequate cleaning of cooling air inlets (intake ports, cylinder fins).
• Corrosion and other consequential damage resulting from improper storage.
• Damage to the machine resulting from the use of poor quality replacement parts.

Parts Subject to Wear and Tear

Some parts of the power tool are subject to normal wear and tear even during regular operation in accordance with instructions and, depending on the type and duration of use, have to be replaced in good time. Among other parts, this includes:

• Clutch
• Filters (air, fuel)
• Rewind starter
• Spark plug

Main Parts

1. Choke knob
2. Carburetor adjusting screw
3. Spark plug boot
4. Cap
5. Air filter cover
6. Stop switch
7. Throttle trigger lockout
8. Control handle
9. Throttle trigger
10. Left handle
11. Handlebar
12. Knob
13. Loop handle
14. Throttle cable retainer
15. Carrying handle
16. Deflector
17. Gearbox
18. Axle
19. Hitch pin
20. Fuel tank
21. Tank cap
22. Manual fuel pump
23. Starter grip
24. Muffler with spark arresting screen

# Serial Number

Specifications

Engine
Single cylinder two-stroke engine
Displacement:	27.2 cc
Bore:	34 mm
Stroke:	30 mm
Engine power to ISO 8893:	0.85 kW (1.2 bhp) at 7,500 rpm
Idle speed:	2,800 rpm
Cut-off speed:	8,900 rpm
Max. output shaft speed (working tool):	200 rpm
Ignition System
Electronic magneto ignition
Spark plug (resistor type):	NGK CMR 6 H, BOSCH USR 4A C
Electrode gap:	0.5 mm
Fuel System
All position diaphragm carburetor with integral fuel pump
Fuel tank capacity:	330 cc (0.33 l)
Weight
Dry, without MultiTool attachment 8.3 kg

Noise and Vibration Data
MultiEngine with MultiTool
Version of MultiTools – see "Approved MultiTools".

BF-MM and BK-MM
Noise and vibration data are measured at idling and nominal operating speed in a ratio of 1:6.

Sound pressure level L_peq to EN 709
87 dB(A)

Sound power level L_w to EN 709
96 dB(A)

Vibration level ahv, eq to EN 709
	Handle, left	Handle, right
BF-MM:	3.8 m/s2	4.4 m/s2
BK-MM:	3.7 m/s2	4.0 m/s2

FC-MM
Noise and vibration data is measured at idling and nominal operating speed in a ratio of 1:1.

Sound pressure level L_p to ISO 11789
91 dB(A)

Sound power level L_w to ISO 11789
100 dB(A)

Vibration level ahv, eq to EN 11789
	Handle, left	Handle, right
FC-MM	4.1 m/s2	5.1 m/s2

KB-KM, KW-KM
Noise and vibration data is measured at idling and nominal operating speed in a ratio of 1:1.

Sound pressure level L_p to ISO 11201
94 dB(A)

Sound power level L_w to EN ISO 118061
102 dB(A)

Vibration level ahv, eq to ISO 20643
	Handle, left	Handle, right
KB-MM:	4.0 m/s2	4.1 m/s2
KW-MM:	4.0 m/s2	4.1 m/s2

MF-MM and RL-MM
Noise and vibration data is measured at idling and nominal operating speed in a ratio of 1:1.

Sound pressure level Lpeq to EN 13684
MF-MM:	94 dB(A)
RL-MM:	93 dB(A)
Sound power level Lw to EN 13684
MF-MM:	101 dB(A)
RL-MM:	102 dB(A)
Vibration level ahv, eq to EN 13864
	Handle, left	Handle, right
MF-MM:	4.1 m/s2	4.5 m/s2
RL-MM:	4.1 m/s2	4.5 m/s2

The K-factor in accordance with Directive 2006/42/EC is 2.0 dB(A) for the sound pressure level and sound power level; the K-factor in accordance with Directive 2006/42/EC is 2.0 m/s² for the vibration level.

Maintenance and Repairs

Users of this machine may only carry out the maintenance and service work described in this user manual. All other repairs must be carried out by a servicing dealer.
STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.
When repairing the machine, only use replacement parts which have been approved by STIHL for this power tool or are technically identical. Only use highquality replacement parts in order to avoid the risk of accidents and damage to the machine.
STIHL recommends the use of original STIHL replacement parts.
Original STIHL parts can be identified by the STIHL part number, the logo and the STIHL parts symbol (the symbol may appear alone on small parts).

Documents / Resources

Download manual

Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.

Download Stihl MM 56 Manual