Stihl MM 56 User manual

MM 56
2 - 20 Instruction Manual

Contents
1 MultiSystem................................................ 2
2 Guide to Using this Manual.........................2
3 Safety Precautions and Working Techni‐
ques............................................................ 2
4 Approved MultiTools................................... 7
5 Adjusting the bicycle handle....................... 7
6 Fuel............................................................. 7
7 Fueling........................................................ 8
8 Starting / Stopping the Engine.................... 9
9 Extra weight.............................................. 11
10 Wheels...................................................... 12
11 Operating Instructions...............................13
12 Replacing the Air Filter..............................13
13 Adjusting the Carburetor........................... 13
14 Spark Arresting Screen in Muffler............. 14
15 Spark Plug................................................ 14
16 Engine Running Behavior......................... 15
17 Storing the Machine.................................. 15
18 Maintenance and Care..............................16
19 Minimize Wear and Avoid Damage...........16
20 Main Parts.................................................17
21 Specifications............................................18
22 Maintenance and Repairs......................... 19
23 Disposal.................................................... 19
24 EC Declaration of Conformity................... 19
25 UKCA Declaration of Conformity.............. 20
1 MultiSystem
+
+
0000-GXX-5897-A0
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.
2 Guide to Using this Manual
2.1 Pictograms
All the pictograms attached to the machine are
shown and explained in this manual.
2.2 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.
2.3 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.
3 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 associa‐
English
2 0458-489-0121-C
© ANDREAS STIHL AG & Co. KG 2022
0458-489-0121-C. VA0.C22.
Printed on chlorine-free paper Printing inks contain vegetable oils, paper can be recycled.
Original Instruction Manual 0000008008_006_GB

tions, 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 res‐
ted, in good physical health and in a good state
of mind.
If you have any condition that might be aggrava‐
ted by strenuous work, check with your doctor
before operating a machine.
Persons with pacemakers only: The ignition sys‐
tem of your power tool produces an electromag‐
netic field of a very low intensity. This field may
interfere with some pacemakers. STIHL recom‐
mends 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 pur‐
poses – risk of accident!
Do not operate the MultiEngine without a prop‐
erly 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 acci‐
dents 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.
3.1 Clothing and Equipment
Wear proper protective clothing and equipment.
Do not wear clothing which could become trap‐
ped 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 should‐
ers.
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.
3 Safety Precautions and Working Techniques English
0458-489-0121-C 3

3.2 Transporting the machine
0000-GXX-0550-A0
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.
3.3 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!
3.4 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.
English 3 Safety Precautions and Working Techniques
4 0458-489-0121-C

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
gearbox.
Ensure that the gear box and the
rotor blades are correctly attached
and aligned. Avoid contact with the
rotor blades - risk of injury!
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
3.5 Starting the engine
Start the engine at least 3 meters from the refuel‐
ing spot and only outdoors.
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 work‐
ing 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 – 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.
3.6 Holding and Controlling the
Power Tool
Make sure you always have a firm and secure
footing.
469BA045 KN
Always hold the unit firmly with both hands on
the handles.
Right hand on control handle, left hand on grip
on handlebar.
3.7 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
3 Safety Precautions and Working Techniques English
0458-489-0121-C 5

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 con‐
tain unburned hydrocarbons and ben‐
zene. Never run the engine indoors or
in poorly ventilated locations, even if
your model is equipped with a cata‐
lytic 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.
3.8 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 cir‐
culation (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.
3.9 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 per‐
formed 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
English 3 Safety Precautions and Working Techniques
6 0458-489-0121-C

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 adjust‐
ments.
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 inter‐
vals.
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 con‐
dition, 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.
4 Approved MultiTools
The following STIHL MultiTools may be mounted
on the MultiEngine:
469BA025 KN
BF-MM
BK-MM
RL-MM
FC-MM
KB-MMKW-MM
MF-MM
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
5 Adjusting the bicycle han‐
dle
0000-GXX-0549-A1
1
► Loosen the knob (1).
► Swing the bicycle handle with both hands into
the working position (as far as stop).
► Tighten down the knob firmly.
6 Fuel
The engine requires a mixture of gasoline and
engine oil.
4 Approved MultiTools English
0458-489-0121-C 7

WARNING
Avoid direct skin contact with fuel and breathing
in of gasoline fumes.
6.1 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.
6.2 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.
6.2.1 Gasoline
Use only high-quality gasoline with an octane rat‐
ing 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 per‐
formance using gasoline with an alcohol compo‐
nent of up to 27% (E27).
6.2.2 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.
6.2.3 Mixing ratio
with STIHL two-stroke engine oil 1:50; 1:50 =
1 part oil + 50 parts gasoline
6.2.4 Examples
Quantity of gaso‐
line
STIHL two-stroke
engine oil 1:50
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)
► Pour oil into an approved safety fuel canister
first, then add gasoline and mix thoroughly
6.3 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 tempera‐
tures.
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!
7 Fueling
7.1 Preparations
547BA045 KN
English 7 Fueling
8 0458-489-0121-C

► 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.
7.2 Opening screw-type tank cap
002BA447 KN
► Turn the cap counterclockwise until it can be
removed from the tank opening.
► Remove the cap.
7.3 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).
7.4 Closing screw-type tank cap
002BA448 KN
► Place the cap in the opening.
► Turn the cap clockwise as far as stop and
tighten it down as firmly as possible by hand.
8 Starting / Stopping the
Engine
8.1 Controls
1
0000-GXX-0538-A0
2
3
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".
8.1.1 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.
8.2 Starting the Engine
► Swing bicycle handle into working position –
see "Adjusting the Bicycle Handle"
8 Starting / Stopping the Engine English
0458-489-0121-C 9

0000-GXX-0540-A0
4
► Depress the manual fuel pump bulb (4) at
least five times – even if the bulb is filled with
fuel.
8.2.1 Cold engine (cold start)
0000-GXX-0539-A0
5
►Depress the choke knob (5) and turn it to g
at the same time.
8.2.2 Warm engine (warm start)
0000-GXX-0541-A0
5
►Depress in 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.
8.2.3 Cranking
► Retract the wheels, if fitted.
0000-GXX-0545-A0
► 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 con‐
tact 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.
0000-GXX-0546-A0
► 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.
English 8 Starting / Stopping the Engine
10 0458-489-0121-C

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.
8.2.4 As soon as the engine runs
0000-GXX-0542-A0
► 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.
8.3 Stopping the Engine
► Depress the momentary contact stop switch –
the engine stops – release the stop switch – it
springs back to the run position.
8.4 Other Hints on Starting
Engine stalls in cold start position g 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 five times – even if the bulb is
already filled with fuel.
► Set the choke knob to suit the engine temper‐
ature.
► Now start the engine.
9 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.
9.1 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:
469BA053 KN
123
4
5
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.
9 Extra weight English
0458-489-0121-C 11

6
469BA054 KN
12
3
4
5
► 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 author‐
ized STIHL servicing dealer.
10 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.
10.1 Installing wheels
No additional weight is attached to the MultiEn‐
gine
To simplify installation, turn the machine so that
it rests on the handles.
3
6
469BA035 KN
241
7
7
5
31
► 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.
English 10 Wheels
12 0458-489-0121-C

10.2 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.
8
469BA036 KN
► Loosen knob (8)
► Engage knob in the desired working position
and tighten it
11 Operating Instructions
11.1 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.
11.2 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.
11.3 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".
12 Replacing the Air Filter
12.1 If There is a Noticeable Loss of
Engine Power
0000-GXX-0543-A0
1
2
3
4
5
►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).
12.2 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.
13 Adjusting the Carburetor
0000-GXX-0544-A0
The carburetor has been set at the factory to pro‐
vide an optimum fuel-air mixture under most
operating conditions.
11 Operating Instructions English
0458-489-0121-C 13

13.1 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.
14 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
1
0000-GXX-0145-A0
► 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
15 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".
15.1 Removing the Spark Plug
► Shut off the engine.
3
1
4907BA014 KN
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).
15.2 Checking the Spark Plug
000BA039 KN
A
► Clean dirty spark plug.
English 14 Spark Arresting Screen in Muffler
14 0458-489-0121-C

► 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.
1
000BA045 KN
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 inju‐
ries or damage to property.
► Use resistor type spark plugs with a properly
tightened adapter nut.
15.3 Installing the spark plug
► Screw the spark plug into the cylinder.
► Press the boot firmly onto the spark plug.
4907BA016 KN
1
► Push the cap (1) on to the spark plug boot as
far as stop.
16 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.
17 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
0000-GXX-0551-A0
Fold the handle down and hang up the machine
by the handle support.
16 Engine Running Behavior English
0458-489-0121-C 15

18 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
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
19 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:
English 18 Maintenance and Care
16 0458-489-0121-C

–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.
19.1 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 defi‐
cient 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.
19.2 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
20 Main Parts
8
7
6
9
12
22
3
10
21
18
17
0000-GXX-0547-A0
11
13
14
15
16
#
19
2
1
15
20
23
24
4
14
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
20 Main Parts English
0458-489-0121-C 17

24 Muffler with spark arresting screen
# Serial Number
21 Specifications
21.1 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
21.2 Ignition System
Electronic magneto ignition
Spark plug
(resistor type):
NGK CMR 6 H
,
BOSCH USR
4AC
Electrode gap: 0.5 mm
21.3 Fuel System
All position diaphragm carburetor with integral
fuel pump
Fuel tank capacity: 330 cc (0.33 l)
21.4 Weight
Dry, without MultiTool attach‐
ment
8.3 kg
21.5 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".
21.6 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)
Vibration level ahv,eq to EN 709
Handle, left Handle,
right
BF‑MM: 3.8 m/s24.4 m/s2
BK‑MM: 3.7 m/s24.0 m/s2
21.7 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)
Vibration level ahv,eq to EN 11789
Handle, left Handle,
right
FC‑MM: 4.1 m/s25.1 m/s2
21.8 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 with
EN ISO 3744
102 dB(A)
Vibration level ahv,eq in accordance with
ISO 20643
Handle, left Handle,
right
KB‑MM: 4.0 m/s24.1 m/s2
KW‑MM: 4.0 m/s24.1 m/s2
21.9 MF‑MM and RL‑MM
Noise and vibration data is measured at idling
and rated maximum engine speed in a ratio of
1:6.
English 21 Specifications
18 0458-489-0121-C

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/s24.5 m/s2
RL‑MM: 4.1 m/s24.5 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.
21.10 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
21.11 Exhaust Emissions
The CO2 value measured in the EU type appro‐
val 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 mainte‐
nance described in this User Manual. The oper‐
ating license shall be void if the engine is modi‐
fied in any way.
22 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 author‐
ized 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 replace‐
ment parts which 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).
23 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.
000BA073 KN
► Take STIHL products including packaging to a
suitable collection point for recycling in accord‐
ance with local regulations.
► Do not dispose with domestic waste.
24 EC Declaration of Con‐
formity
ANDREAS STIHL AG & Co. KG
Badstr. 115
D‑71336 Waiblingen
Germany
declare under our sole responsibility that
Designation: MultiEngine
22 Maintenance and Repairs English
0458-489-0121-C 19

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
25 UKCA Declaration of Con‐
formity
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
complies with the relevant provisions of the UK
regulations The Restriction of the Use of Certain
Hazardous Substances in Electrical and Elec‐
tronic Equipment Regulations 2012, Supply of
Machinery (Safety) Regulations 2008, and Elec‐
tromagnetic Compatibility Regulations 2016 and
has been developed and manufactured in
accordance with the versions of the following
standards valid on the date of manufacture:
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
The year of manufacture and serial number are
indicated on the product.
Done at Waiblingen, 15.07.2021
ANDREAS STIHL AG & Co. KG
pp
Dr. Jürgen Hoffmann
Director Product Certification & Regulatory
Affairs
English 25 UKCA Declaration of Conformity
20 0458-489-0121-C