STIHL MM 56 Garden Cultivator and Tiller Instruction Manual

STIHL MM 56 Garden Cultivator and Tiller

MultiSystem

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 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 man‐ual.

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 (Multi‐Engine 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 employers’ liability insurance associations, social insurance systems, occupational 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 motorized device – except for apprentices over the age of 16 when working under supervision.
• Children, animals and onlookers must remain at a safe 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 or rent your power tool without the Multi‐Engine 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 a good state of mind.
• 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 very low intensity. This field may interfere with some pacemakers. STIHL recommends that persons with pacemakers consult their physician and the pacemaker manufacturer to minimize any health risk.
• Anyone who has consumed alcohol, medications or drugs that impair 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 – the risk of accident!
• 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 genuine 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 that could become trapped in wood, brush or moving parts of the machine. Do not wear a scarf, necktie or jewelry. Tie up and secure long hair above your shoulders.

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

WARNING

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 pro‐tect 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 may be damaged. Secure the power tool with lashing straps or a net to prevent it turn‐ing 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 to pre‐vent fuel spraying out.
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 assem‐bled 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 attach‐ment and deflector. All parts must be assem‐bled 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”.

The power tool must only be operated when it is in good operating condition – Risk of accident!
See also notes on “Before Starting” in the user manual of the MultiTool you are using.
Check the position of the gearbox for the Multi‐Tool you have mounted and correct it if neces‐sary. This helps reduce the risk of injury from the MultiTool rotating in the wrong direction.
See “Installing the MultiTool” in the User Manual of the MultiTool you are using.

Arrows on the rotor blades show the direction of rotation. The arrows on the rotor blades must point in the same direction as the arrows on the gear.

Ensure that the gear unit and the rotor blades are correctly attached and aligned and avoid contact with the rotor blades – risk of injury!

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 – fly‐wheel 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 a firm 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 emer‐gency, 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 work tool 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 con‐trolled in this position.
• Be particularly alert and cautious when wearing ear protection because your ability to hear warn‐ings (shouts, alarms, etc.) is impaired.
• Take breaks when you start getting tired or feel‐ing 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 starts running, the power tool 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 con‐fined 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 in such a way 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. Com‐bustible fuel vapor may escape from the fuel sys‐tem.
• Dust, fumes and smoke produced while working may be hazardous to health. Wear respiratory protection in case of heavy dust or smoke emis‐sion.

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 deflec‐tor or to one side of the machine dur‐ing 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
• FS‑MM
  • Clearing saw
• MF‑MM
  • Dethatcher
• KW‑MM STIHL
  • PowerSweepTM
• 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

The engine requires a mixture of gasoline and engine oil.

WARNING Avoid direct skin contact with fuel and breathing in of gasoline fumes.

STIHL MotoMix

STIHL recommends using STIHL MotoMix. This pre-blended fuel is free of benzene and lead, is distinguished by a high octane rating, and always provides the proper mixing ratio.
STIHL MotoMix uses STIHL HP Ultra two-stroke engine oil for optimum engine life.
MotoMix is not available in all markets.

Mixing fuel

NOTICE Unsuitable fuels or a mixing ratio that deviates from the specification can lead to severe engine damage. The engine, seals, fuel lines and fuel tank may be damaged if low-quality gasoline or engine oil is used.

Gasoline

• Use only high-quality gasoline with an octane rating of at least 90 ROC – leaded or unleaded.
• Gasoline with an alcohol component exceeding 10% can cause impaired engine performance in engines with manually adjustable carburetors and thus should not be used in these engines.
• Engines with M-Tronic deliver full engine performance using gasoline with an alcohol component of up to 27% (E27).

Engine oil

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

Mixing ratio with STIHL two-stroke engine oil 1:50; 1:50 = 1 part oil + 50 parts gasoline

Examples

• Pour oil into an approved safety fuel canister first, then add gasoline and mix thoroughly

Storing fuel mixture

Store in approved safety fuel canisters only in a dry, cool and secure place protected against light and sunlight.
Fuel mixture deteriorates with age – mix only as much as needed for a few weeks. Do not store fuel mixture for longer than 30 days. The fuel mixture can become unusable more quickly if exposed to light, sunlight or low or high temperatures.
STIHL MotoMix however can be stored for up to 5 years without any problems.

• Shake the canister containing the fuel mixture thoroughly before refueling

WARNING Pressure may have built up in the canister open it carefully.

• The fuel tank and the canister in which fuel mixture is stored should be cleaned thoroughly from time to time

Residual fuel and the liquid used for cleaning must be disposed of in accordance with regula‐tions and without harming the environment!

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 stop‐ped 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 the choke knob (5) and turn it to at the same time.

Also use this setting if the engine has been run‐ning 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 the rotating attachment, always stand to one 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.

Version without ErgoStart

• Pull the starter grip slowly until you feel it engage and then give it a brisk strong pull.

Version with ErgoStart

• Pull the starter grip steadily.

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 F. After a cold start, warm up the engine by opening the throttle several times.

WARNING 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 g 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 con‐nected.

• Repeat the starting procedure.
  Engine is flooded

• Move the choke knob to F and continue crank‐ing until the engine runs.

Fuel tank run until completely dry

• After refueling, depress the manual fuel pump bulb at least 5 times – even if the bulb is already filled with fuel.
• Set the choke knob to suit the engine temper‐ature.
• Now start the engine.

Extra weight

An extra weight (special accessory) may be ret‐rofitted 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.

Mounting the extra weight

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 acces‐sory).
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 MultiEn‐gine
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 serv‐icing 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 dur‐ing 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 engine-mounted 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-of-service 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).
• 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 pro‐vide 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 clock‐wise until the engine runs smoothly – the Mul‐tiTool must not run.

MultiTool runs when the engine is idling

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

WARNING 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

WARNING 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 “Specifica‐tions”.

Removing the Spark Plug

• Shut off the engine.
• The spark plug boot (2) is under the cap (1).

WARNING 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 neces‐sary – see “Specifications”.
• Rectify the problems which have caused foul‐ing of the spark plug.

Possible causes are:

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

WARNING 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 (car‐bonization) by your servicing dealer.
STIHL recommends that you have servicing and repair work carried out exclusively by an author‐ized STIHL servicing dealer.

Storing the Machine

For periods of about 30 days or longer

• Drain and clean the fuel tank in a well-ventila‐ted area.
• Dispose of fuel properly in accordance with local environmental requirements.
• If a manual fuel pump is fitted: Press the man‐ual fuel pump at least 5 times.
• Start the engine and run it at idling speed until it stops
• Thoroughly clean the unit, especially the cylin‐der 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

The following intervals apply for normal operating conditions. The specified intervals must be short‐ ened accordingly when working for longer than nor‐ mal or under difficult cutting conditions (extensive dust, etc.).| Before starting work| At the end of work and/or daily| Whenever tank is refilled| Weekly| Monthly| Annually| If faulty| If damaged| As required
---|---|---|---|---|---|---|---|---|---
Complete machine| Visual inspection (condi‐

tion, leaks)

| X| | X| | | | | |
Clean| | X| | | | | | |
Control handle| Function test| X| | X| | | | | |
Air filter| Clean| | | | | | | X| | X
The following intervals apply for normal operating conditions. The specified intervals must be short‐ ened accordingly when working for longer than nor‐ mal or under difficult cutting conditions (extensive dust, etc.).| Before starting work| At the end of work and/or daily| Whenever tank is refilled| Weekly| Monthly| Annually| If faulty| If damaged| As required
---|---|---|---|---|---|---|---|---|---
| replace| | | | | | | | X|
Manual fuel pump (if present)| check| X| | | | | | | |
Have repaired by a spe‐

cialist dealer1)

| | | | | | | | X|
Fuel pickup body in fuel tank| check| | | | | | | X| |
Have replaced by serv‐

icing dealer1)

| | | | | | X| | X| X
Fuel tank| Clean| | | | | | | X| | X
Carburetor| Check idle adjustment, the work tool must not

turn

| X| | X| | | | | |
Readjust idle speed| | | | | | | | | X
Spark plug| Adjust electrode gap| | | | | | | X| |
Replace after every 100

hours of operation

| | | | | | | | |
Intake port for cooling air| Visual inspection| | X| | | | | | |
Clean| | | | | | | | | X
Spark arresting screen in muffler| Check if installed| X| | | | | | | |
Check or replace1)| | | | | | X| | |
All accessible screws, nuts and bolts (not

adjusting screws)

| Tighten| | | | | | | | | X
Safety information label| replace| | | | | | | | X|
1)STIHL recommends STIHL dealers

Minimize Wear and Avoid Damage

Observing the instructions in this manual helps reduce the risk of unnecessary wear and dam‐age 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, oper‐ating and maintenance instructions in this man‐ual. 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 per‐formed 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 author‐ized 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, cyl‐inder 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 nor‐mal 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 lever
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. Carrying handle
15. Deflector
16. Gearbox
17. Axle
18. Hitch pin
19. Fuel tank
20. Tank cap
21. Manual fuel pump
22. Starter grip
23. Muffler with spark arresting screen

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 (Multi-Tool): 200 rpm

Ignition System

Electronic magneto ignition

• Spark plug (resistor type):
  • NGK CMR 6 H, BOSCH USR 4 AC
• 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 attachment 7.9 kg

Sound and Vibration Levels
For further details on compliance with Vibration
Directive 2002/44/EC, see www.stihl.com/vib

MultiEngine with MultiTool
Version of MultiTools – see “Approved Multi‐ Tools”.

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

Sound pressure level Lpeq in accordance with EN 709
87 dB(A)
Sound power level Lw in accordance with EN 709
96 dB(A)

FC‑MM
Noise and vibration data is measured at idling and rated maximum engine speed in a ratio of 1:1.

Sound pressure level Lpeq in accordance with ISO 11789 : 91 dB(A)

Sound power level Lw in accordance with ISO 11789: 100 dB(A)

FS‑MM
Noise and vibration data is measured at idling and rated maximum engine speed in a ratio of 1:6.

Sound pressure level Lpeq in accordance with DIN EN 14910: 93 dB(A)

Sound power level Lw in accordance with DIN EN 14910: 102 dB(A)

KB‑KM, KW‑KM
Noise and vibration data is measured at idling and rated maximum engine speed in a ratio of 1:6.
Sound pressure level Lpeq in accordance with ISO 11201: 94 dB(A)
Sound power level Lw in accordance withEN ISO 3744: 102 dB(A)

Vibration level ahv,eq in accordance with ISO 20643

MF‑MM and RL‑MM
Noise and vibration data is measured at idling and rated maximum engine speed in a ratio of 1:6.

Sound pressure level Lpeq in accordance with EN 13684
MF‑MM: 94 dB(A)
RL‑MM 93 dB(A)

Sound power level Lw in accordance with 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.

REACH

REACH is an EC regulation and stands for the Registration, Evaluation, Authorization and Restriction of Chemical substances.
For information on compliance with the REACH regulation (EC) No. 1907/2006 see www.stihl.com/reach

Exhaust Emissions
The CO2 value measured in the EU type approval procedure is specified at www.stihl.com/co2 in the product-specific technical data.

The measured CO2 value was determined on a representative engine in accordance with a standardized test procedure under laboratory conditions and does not represent either an explicit or implied guarantee of the performance of a specific engine.
The applicable exhaust emission requirements are fulfilled by the intended usage and maintenance described in this User Manual. The oper‐ating license shall be void if the engine is modi‐fied in any way.

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 that have been approved by STIHL for this power tool or are technically identical. Only use high- quality 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 K (the symbol may appear alone on small parts).

Disposal

Contact the local authorities or your STIHL serv‐icing dealer for information on disposal.
Improper disposal can be harmful to health and pollute the environment.

• Take STIHL products including packaging to a suitable collection point for recycling in accord‐ance with local regulations.
• Do not dispose with domestic waste.

EC Declaration of Conformity

ANDREAS STIHL AG & Co. KG Badstr. 115
D‑71336 Waiblingen Germany declare under our sole responsibility that

Designation: MultiEngine
Make: STIHL
Series: MM 56
Serial identification number: 4604
Displacement: 27.2cm3

conforms to the relevant provisions of Directives 2011/65/EU, 2006/42/EC and 2014/30/EU and has been developed and manufactured in com‐pliance with the following standards in the ver‐sions valid on the date of production:

EN ISO 12100, EN 55012, EN 61000‑6‑1 (in conjunction with the specified MultiTools BF‑MM, BK‑MM, RL‑MM, FC‑MM, MF‑MM, KB‑MM, KW‑MM)
The MultiEngine described here may be oper‐ated only in conjunction with the MultiTools approved by STIHL for use with this MultiEngine.
Technical documents deposited at:

ANDREAS STIHL AG & Co. KG Produktzulassung
The year of manufacture and serial number are applied to the product.
Done at Waiblingen, 15.07.2021 ANDREAS STIHL AG & Co. KG pp

Dr. Jürgen Hoffmann
Director Product Certification & Regulatory Affairs

References

• Country Routing Page: Welcome to STIHL | STIHL
• Information on Physical Agents Directive Vibration | STIHL | STIHL
• Country Routing Page: Welcome to STIHL | STIHL

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