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STIHL MM 55
Instruction Manual
Manual de instrucciones
Warning!
Read and follow all safety precautions in Instruction Manual – improper use can cause serious or fatal injury.
Advertencia!
Lea y siga todas las precauciones de seguridad dadas en el manual de instrucciones – el uso incorrecto puede causar lesiones graves o mortales.
Instruction Manual 1 - 28
Manual de instrucciones 29 - 60
Contents
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MultiSystem |
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Guide to Using this Manual |
2 |
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Manual |
Safety Precautions and Working |
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Techniques |
3 |
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Approved MultiTools |
10 |
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Instruction |
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Fuel |
11 |
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Adjusting the bicycle handle |
10 |
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Original |
Fueling |
12 |
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Starting / Stopping the Engine |
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recycled. |
Extra weight |
14 |
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Wheels |
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Operating Instructions |
16 |
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be |
Replacing the Air Filter |
17 |
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can |
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Engine Management |
17 |
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paper |
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Adjusting the Carburetor |
18 |
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oils, |
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Spark Plug |
19 |
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paperfree-chlorineon vegetablecontaininks |
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Engine Running Behavior |
20 |
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Rewind Starter |
20 |
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Storing the Machine |
21 |
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Inspections and Maintenance by |
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Printed Printing |
Dealer |
21 |
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Maintenance and Care |
22 |
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Main Parts |
23 |
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Specifications |
24 |
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Special Accessories |
25 |
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2011 |
Maintenance and Repairs |
25 |
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STIHL Incorporated Federal |
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STIHLANDREAS© AG & Co. KG, 8621-469-0458-B. M9-5.H11.CP. 0040000000537GB |
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Emission Control Warranty |
26 |
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Statement |
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Trademarks |
28 |
English
Allowonlypersonswhofullyunderstand the manuals of the MultiEngine and the MultiTool to operate your power tool.
To receive maximum performance and satisfactionfromyourSTIHLpowertool, it is important that you read, understand and follow the safety precautions and the operating and maintenance instructions in chapter "Safety Precautions and Working Techniques" beforeusingyourpowertool.Forfurther information you can go to www.stihlusa.com.
Contactyour STIHLdealer or theSTIHL distributor for your area if you do not understand any of the instructions in the two manuals.
Warning!
Because this MultiEngine is the engine for a high-speed power tool, some spe- cial safety precautions must be observed to reduce the risk of personal injury. Careless or improper use may cause serious or even fatal injury.
Makesureyourunitisequippedwiththe proper deflector for the type of cutting attachment being used. Always wear proper eye protection.
MM 55, MM 55 C |
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MultiSystem |
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469BA028 |
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In the STIHL MultiSystem, various MultiEngines and MultiTools are combined to form a machine. In this Instruction Manual, the functional unit of MultiEngine and MultiTool is referred to as a machine.
Accordingly, the instruction manuals for the MultiEngine and the MultiTool constitute the entire Instruction Manual for the machine.
Always read both manuals carefully before using your machine for the first time and keep them safe for future reference.
Guide to Using this Manual
Pictograms
All the pictograms attached to or embossed on the machine are shown and explained in this manual.
Symbols in Text
Many operating and safety instructions are supported by illustrations.
The individual steps or procedures describedin themanualmaybemarked in different ways:
N A bullet marks a step or procedure.
A description of a step or procedure that refers directly to an illustration may contain item numbers that appear in the illustration. Example:
N Loosen the screw (1). N Lever (2) ...
In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols and signal words described below:
Danger!
Indicates an imminent risk of severe or fatal injury.
Warning!
Indicatesahazardoussituationwhich,if not avoided, could result in severe or fatal injury.
Caution!
Indicates a risk of property damage, including damage to the machine or its individual components.
Engineering Improvements
STIHL’s philosophy is to continually improve all of its products. As a result, engineeringchangesandimprovements are made from time to time. Therefore, some changes, modifications and improvements may not be covered in this manual. If the operating characteristics or the appearance of your machine differ from those describedinthismanual,pleasecontact your STIHL dealer for assistance.
2 |
MM 55, MM 55 C |
Safety Precautions and
Working Techniques
Because this MultiEngine is the engine for a highspeed power tool, special safety precautions must be observed to reduce the risk of personal injury.
It is important that you read, fully understand and observe the following safety precautions and warnings. Read the instruction manuals and the safety precautions of your MultiEngine and MultiTool periodically. Careless or improper use may cause serious or fatal injury.
Have your STIHL dealer show you how to operate your power tool. Observe all applicable local safety regulations, standards and ordinances.
Warning!
Do not lend or rent your power tool with- outtheinstructionmanuals.Besurethat anyone using it understands the infor- mation contained in these manuals.
Use your power tool only for the applications described in the instruction manual of the MultiTool you are using.
Warning!
Do not use it for other purposes, since misuse may result in personal injury or property damage, including damage to the machine.
MM 55, MM 55 C
Warning!
Minors should never be allowed to use this power tool. Bystanders, especially children, and animals should not be allowed in the area where it is in use.
Warning!
To reduce the risk of injury to bystand- ers and damage to property, never let yourpowertoolrununattended.Whenit is not in use (e.g. during a work break), shut it off and make sure that unauthor- ized persons do not use it.
Most of these safety precautions and warnings apply to the use of all STIHL power tools. Different models may have different parts and controls. See the appropriate section of your MultiEngine and MultiTool instruction manuals for a description of the controls and the function of the parts of your model.
Safe use of a power tool involves
1.the operator
2.the power tool
3.the use of the power tool
THE OPERATOR
Physical Condition
You must be in good physical condition and mental health and not under the influence of any substance (drugs, alcohol, etc.) which might impair vision, dexterity or judgment. Do not operate this machine when you are fatigued.
English
Warning!
Be alert – if you get tired, take a break. Tiredness may result in loss of control. Working with any power tool can be strenuous. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating this machine.
Warning!
Prolonged use of a power tool (or other machines) exposing the operator to vibrations may produce whitefinger dis- ease (Raynaud's phenomenon) or carpal tunnel syndrome.
These conditions reduce the hand's ability to feel and regulate temperature, produce numbness and burning sensations and may cause nerve and circulation damage and tissue necrosis.
All factors which contribute to whitefinger disease are not known, but cold weather, smoking and diseases or physical conditions that affect blood vessels and blood transport, as well as high vibration levels and long periods of
3
English
exposure to vibration are mentioned as factorsinthedevelopmentofwhitefinger disease. In order to reduce the risk of whitefinger disease and carpal tunnel syndrome, please note the following:
–Wear gloves and keep your hands warm.
–Apowertoolwithloosecomponents will tend to have higher vibration levels.
–Maintain a firm grip at all times, but do not squeeze the handles with constant, excessive pressure. Take frequent breaks.
All the above-mentioned precautions do not guarantee that you will not sustain whitefinger disease or carpal tunnel syndrome. Therefore, continual and regular users should closely monitor the condition of their hands and fingers. If any of the above symptoms appear, seek medical advice immediately.
Warning!
The ignition system of the STIHL unit produces an electromagnetic field of a very low intensity. This field may inter- fere with some pacemakers. To reduce theriskofseriousorfatalinjury,persons with a pacemaker should consult their physician and the pacemaker manufac- turer before operating this tool.
Proper Clothing
Warning!
Toreducetheriskofinjury,theoperator should wear proper protective apparel.
4
Warning!
Never operate your power tool unless wear-
ing goggles or properly fitted protective glasses with adequate top and sideprotectioncomplying
with ANSI Z 87.1 (or your applicable nationalstandard).Toreducetheriskof injury to your face STIHL recommends that you also wear a face shield or face screen over your goggles or protective glasses.
Power tool noise may damage your hearing.Wearsoundbarriers(earplugs or ear mufflers) to protect your hearing. Continual and regular users should have their hearing checked regularly.
Be particularly alert and cautious when wearing hearing protection because your ability to hear warnings (shouts, alarms, etc.) is restricted.
Good footing is very important. Wear sturdy boots with nonslip soles.
For further instructions on proper clothing see the safety precautions in the instruction manual of the MultiTool you are using.
THE POWER TOOL
For illustrations and definitions of the power tool parts see the chapter on "Main Parts."
Warning!
Nevermodifythispowertoolinanyway. Only attachments supplied by STIHL or expressly approved by STIHL for use with the specific STIHL MultiEngine model are authorized. Although certain unauthorized attachments are useable with STIHL power tools, their use may, in fact, be extremely dangerous.
If this tool is subjected to unusually high loads for which it was not designed (e.g. heavy impact or a fall), always check that it is in good condition before continuing work.Checkin particularthat the fuel system is tight (no leaks) and that the controls and safety devices are working properly. Do not continue operating this machine if it is damaged. Incaseofdoubt,haveitcheckedbyyour STIHL servicing dealer.
THE USE OF THE POWER TOOL
Transporting the Power Tool
Warning!
Always switch off the engine and make sure the working tool has stopped beforeputtingapowertooldown.When transporting your power tool in a vehi- cle, properly secure it to prevent turnover, fuel spillage and damage to the power tool.
Fuel
Your STIHL power tool uses an oilgasoline mixture for fuel (see the chapter on "Fuel" of your instruction manual).
MM 55, MM 55 C
Warning!
Gasoline is an extremely flammable fuel. If spilled and ignited by a spark or other ignition source, it can cause fire and seri-
ous burn injury or property damage. Use extreme caution when handling gasoline or fuel mix. Do notsmokeorbringanyfireorflamenear the fuel or the power tool. Note that combustible fuel vapor may escape from the fuel system.
Fueling Instructions
Warning!
Fuel your power tool in well-ventilated areas, outdoors. Always shut off the engine and allow it to cool before refu- eling. Gasoline vapor pressure may build up inside the fuel tank depending onthefuelused,theweatherconditions and the tank venting system.
In order to reduce the risk of burns and other personal injury from escaping gas vapor and fumes, remove the fuel filler capon yourpowertool carefully so asto allow any pressure build-up in the tank torelease slowly. Neverremovethe fuel filler cap while the engine is running.
Selectbare groundforfuelingandmove at least 10 feet (3 m) from the fueling spot before starting the engine. Wipe off any spilled fuel before starting your machine.
Warning!
Check for fuel leakage while refueling and dur- ing operation. If fuel leakage is found, do not start or run the engine untiltheleakisfixedand
any spilled fuel has been wiped away. Take care not to get fuel on your cloth- ing. If this happens, change your clothing immediately.
Different models may be equipped with different fuel caps.
Toolless cap with grip
Warning!
In order to reduce the risk of fuel spill- age and fire from an improperly tightened fuel cap, correctly position and tighten the fuel cap in the fuel tank opening.
001BA220 KN
To do this with this STIHL cap, raise the griponthetopofthecapuntilitisupright at a 90° angle. Insert the cap in the fuel tank opening with the raised positioning marks on the grip of the cap and on the fuel tank opening lining up. Using the grip, press the cap down firmly while turning it clockwise as far as it will go (approx. 1/4 turn).
English
Fold the grip flush with the top of the cap. Grip 
the cap and check for tightness. If the grip does not lie completely flush
with the cap and the detent on the grip does not fit in the correspond- ing recess in the filler opening, or if the cap is loose in the filler opening, the cap is not properly seated and tightened and you must repeat the above steps.
Misaligned, damaged or broken cap
NIfthecapdoesnotdropfullyintothe openingwhenthepositioningmarks line up and/or if the cap does not tighten properly when twisted, the baseofthecapmaybeprematurely rotated (in relation to the top) to the closed position. Such misalignment can result from handling, cleaning or an improper attempt at tightening.
001BA227 KN |
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Base of cap in closed posi- |
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tion (with open space) |
Right: |
Base of cap correctly posi- |
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tioned for installation |
MM 55, MM 55 C |
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001BA226 KN |
NTo return the cap to the open position for installation, turn the cap (with the grip up) until it drops fully intothetankopening.Next,twistthe capcounterclockwiseasfarasitwill go (approx. 1/4 turn) – this will twist the base of the cap into the correct position. Then, twist the cap clockwise, closing it normally.
NIf your cap still does not tighten properly, it may be damaged or broken; immediately stop use of the unit and take it to your authorized STIHL dealer for repair.
Screw Cap
Warning!
Unit vibrations can cause an improperly tightened fuel filler cap to loosen or
come off and spill quanti- ties of fuel. In order to reduce the risk of fuel
spillage and fire, tighten the fuel filler cap by hand as securely as possible.
See also the "Fueling" chapter in your Instruction Manual for additional information.
6
Before Starting
Before starting work, open up the bike handle and lock it in position with the rotary knob. See chapter on "Adjusting the Bike Handle."
Warning!
Alwayscheckyourpowertoolforproper condition and operation before starting, particularly the throttle trigger, starting throttle lock, slide control / stop switch, working tool and deflector. The throttle trigger must move freely and always spring back to the idle position. Never attempt to modify the controls or safety devices.
Warning!
Never operate your power tool if it is damaged, improperly adjusted or main- tained, or not completely or securely assembled.
Inspect for loose parts (nuts, screws, etc.) and for cracked, bent, warped or damaged working tools.
Warning!
Check that the spark plug boot is securely mounted on the spark plug – a loose boot may cause arcing that could ignite combustible fumes and cause a fire.
Keep the handles clean and dry at all times; it is particularly important to keep themfreeofmoisture,pitch,oil,fuelmix, grease or resin in order for you to maintain a firm grip and properly control your power tool.
Warning!
To reduce the risk of injury from a MultiToolrotatinginthewrongdirection, check that the position of the gearbox is correct and change it if necessary.
On metal tools (top illustration), position the gearbox so that the shaft is below the drive tube.
Use for:
–BF-MM cultivator blades with pointed tines
–BK-MM cultivator blades with curved tines
–FC-MM edger
–RL-MM aerator
–MF-MM dethatcher
On sweeping tools (bottom illustration), position the gearbox so that the shaft is above the drive tube.
Use for:
–KB-MM bristle brush
–KW-MM STIHL PowerSweep
MM55, MM 55 C
Check the instruction manual for the MultiTool to ensure you are using the appropriate deflector for that MultiTool.
Starting
Start the engine at least 10 feet (3 m) from the fueling spot, outdoors only.
Forspecificstartinginstructions,seethe appropriate section of your MultiEngine and MultiTool manuals.
Place the power tool on firm ground or other solid surface in an open area. Maintain good balance and secure footing.
469BA027 KN
Warning!
Always stand to one side of the unit to avoid the risk of injury from contact with the rotating working tool.
Warning!
To reduce the risk of injury from loss of con- trol, be absolutely sure
that the working tool is clear of you and all other obstructions and
objects, including the ground, because when the engine starts at starting-throt- tle, engine speed will be fast enough for the clutch to engage and move the working tool.
Once the engine has started, immediately blip the throttle trigger, whichshouldreleasethestartingthrottle and allow the engine to slow down to idle.
Warning!
Your power tool is a one-person machine. Do not allow other persons in the general work area, even when starting.
Stop the engine and working tool immediately if you are approached.
5m (16ft)
Toreducetheriskofeyeandotherinjury always wear proper eye protection (see section on "Proper Clothing") and ensure that bystanders are at least 16 feet(5 m)away.Toreducetheriskof damage to property, also maintain this distance from such objects as vehicles
English
orwindows.Anycoworkerswhomustbe in the restricted area should also wear goggles or protective glasses.
Warning!
To reduce the risk of injury from loss of control, do not attempt to "drop start" your power tool.
Warning!
When you pull the starter grip, do not wrap thestarterropearound yourhand. Do not let the grip snap back, but guide the starter rope to rewind it properly.
Failure to follow this procedure may result in injury to your hand or fingers and may damage the starter mechanism.
See also the safety precautions on Starting in the instruction manual of the MultiTool.
Important Adjustments
Warning!
To reduce the risk of personal injury from loss of control or contact with the running working tool, do not use a power tool with incorrect idle adjust- ment. At correct idle speed, the working tool should not move. For directions on how to adjust idle speed, see the appro- priate section of your instruction manual.
If you cannot set the correct idle speed, have your STIHL dealer check your power tool and make proper adjustments and repairs.
MM 55, MM 55 C |
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During Operation
Holding and Controlling the Power Tool
469BA045 KN
Always hold the unit firmly with both hands on the handles while you are working. Wrap your fingers and thumbs around the handles, keeping the handles cradled between your thumb and forefinger. Keep your hands in this position to have your power tool under control at all times.
Warning!
To reduce the risk of injury from loss of control, never work on a ladder or on any other insecure support.
Working Conditions
Operate and start your power tool only outdoors in a well ventilated area. Operate it under good visibility and daylight conditions only. Work carefully.
Warning!
As soon as the engine is running, this product gen- erates toxic exhaust
fumes containing chemi- cals, such as unburned hydrocarbons (including benzene) and carbon monoxide, that
are known to cause respiratory prob- lems, cancer, birth defects, or other reproductive harm. Some of the gases (e.g. carbon monoxide) may be color- less and odorless. To reduce the risk of serious or fatal injury / illness from inhal- ing toxic fumes, never run the machine indoors or in poorly ventilated locations.
Warning!
Inhalation of certain dusts, especially organic dusts such as mold or pollen, can cause susceptible persons to have an allergic or asthmatic reaction. Sub- stantial or repeated inhalation of dust andotherairborne contaminants,inpar- ticular thosewith asmaller particlesize, may cause respiratory or other ill- nesses. Control dust at the source where possible. Use good work prac- tices, such as operating the unit so that the wind or operating process directs any dust raised by the power tool away from the operator. Follow the recom- mendations of EPA / OSHA / NIOSH and occupational and trade associa- tions with respect to dust ("particulate matter"). When the inhalation of dust cannot be substantially controlled, i.e., kept at or near the ambient (back- ground) level, the operator and any bystanders should wear a respirator approvedbyNIOSH/MSHAforthetype of dust encountered.
Operating Instructions
Warning!
Do not operate your power tool using the starting throttle lock, as you do not have control of the engine speed.
In the event of an emergency, switch off theengineimmediately–movethe slide control / stop switch to 0 or STOP.
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MM 55, MM 55 C |
Warning!
The muffler and other parts of the engine (e.g. fins of the cylinder, spark plug) become hot during operation and remain hot for a while after stopping the engine. To reduce risk of burns do not touch the muffler and other parts while they are hot.
Warning!
Toreducetheriskoffireandburninjury, keep the area around the muffler clean. Remove excess lubricant and all debris such as pine needles, branches or leaves. Let the engine cool down sitting in the upright position on concrete, metal, bare ground or solid wood away from any combustible substances.
Warning!
Never modify your muffler. The muffler could be damaged and cause an increase in heat radiation or sparks, thereby increasing the risk of fire and burn injury. You may also permanently damage the engine. Have your muffler serviced and repaired by your STIHL servicing dealer only.
MAINTENANCE, REPAIR AND STORING
Maintenance, replacement, or repair of the emission control devices and systems may be performed by any nonroad engine repair establishment or individual. However, if you make a warranty claim for a component which has not been serviced or maintained
MM 55, MM 55 C
properly or if nonapproved replacement parts were used, STIHL may deny coverage.
Warning!
Use only identical STIHL replacement partsformaintenanceandrepair.Useof non-STIHL parts may cause serious or fatal injury.
Strictly follow the maintenance and repair instructions in the appropriate section of your MultiEngine and MultiTool instruction manuals. Please refer to the maintenance charts respectively the maintenance notes in these manuals.
Warning!
Always stop the engine and make sure that the working tool is stopped before doinganymaintenanceorrepairworkor cleaning the power tool. Do not attempt any maintenance or repair work not described in your MultiEngine and MultiTool instruction manuals. Have such work performed by your STIHL servicing dealer only.
Wear gloves when handling or performing maintenance on any blade.
Warning!
Never repair damaged working tools by welding, straightening or modifying the shape. This may cause parts of the working tool to come off and result in serious or fatal injuries.
English
Warning!
Use the specified spark plug and make sure it and the ignition lead are always clean and in good condition. Always presssparkplugbootsnuglyontospark plugterminalofthepropersize.(Note:If terminal has a detachable SAE adapter nut, it must be attached.) A loose con- nection between spark plug boot and the ignition wire connector in the boot may create arcing that could ignite com- bustible fumes and cause a fire.
Warning!
Never test the ignition system with the ignition wire boot removed from the spark plug or with a removed spark plug, since uncontained sparking may cause a fire.
Warning!
Do not operate your power tool if the muffler is damaged, missing or modi- fied. An improperly maintained muffler will increase the risk of fire and hearing loss.Ifyourmufflerwasequippedwitha spark-arresting screen to reduce the risk of fire, never operate your power toolifthescreenismissingordamaged. Remember that the risk of forest fires is greater in hot or dry weather.
Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use.
Do not clean your machine with a pressure washer. The solid jet of water may damage parts of the machine.
Store the power tool in a dry and high or locked location out of reach of children.
9
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Before storing for longer than a few days, always empty the fuel tank. See chapter "Storing the Machine" in the instruction manual.
Approved MultiTools |
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Adjusting the bicycle handle |
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The following STIHL MultiTools may be attached to the MultiEngine:
BF-MM |
RL-MM |
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BK-MM |
FC-MM |
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MF-MM |
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KN |
KW-MM |
KB-MM |
469BA025 |
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MultiTool |
Intended use |
BF-MM |
Soil cultivator |
BK-MM |
Bolo tines |
RL-MM |
Lawn aerator |
FC-MM |
Lawn edger |
MF-MM |
Dethatcher |
KW-MM |
STIHL |
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PowerSweepTM |
KB-MM |
Bristle brush |
469BA007 KN |
N Loosen knob (1)
NFold out bicycle handle in working position as far as it will go
N Tighten knob
10 |
MM 55, MM 55 C |
Fuel
This engine is certified to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of highquality gasoline and two-stroke air cooled engine oil.
Usemid-gradeunleadedgasolinewitha minimum octane rating of 89 (R+M/2) and no more than 10% ethanol content.
Fuel with a lower octane rating may increase engine temperatures. This, in turn, increases the risk of piston seizure and damage to the engine.
The chemical composition of the fuel is also important. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines,etc.),butmagnesiumcastingsand catalytic converters as well. This could cause running problems or even damage the engine. For this reason STIHL recommends that you use only high-quality unleaded gasoline!
Gasoline with an ethanol content of more than 10% can cause running problems and major damage in engines with a manually adjustable carburetor and should not be used in such engines.
The ethanol content in gasoline affects engine running speed – it may be necessary to readjust the carburetor if you use fuels with various ethanol contents.
Warning!
To reduce the risk of personal injury from loss of control and / or contact with the running cutting tool, do not use your unit with incorrect idle adjustment. At correct idle speed, the cutting tool should not move.
If your power tool shows an incorrect idleadjustment,haveyourSTIHLdealer check your power tool and make proper adjustments and repairs.
The idle speed and maximum speed of the engine change if you switch from a fuel with a certain ethanol content to another fuel with a much higher or lower ethanol content.
This problem can be avoided by always using fuel with the same ethanol content.
Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that are designed for use only in air cooled two-cycle engines.
WerecommendSTIHLHPUltra2-Cycle Engine Oil since it is specially formulated for use in STIHL engines.
Do not use BIA or TCW rated (twostroke water cooled) mix oils or other mixoilsthatstatetheyareforuseinboth water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.).
Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the container from your vehicle and place the containeronthegroundbeforefilling.To reduce the risk of sparks from static
English
discharge and resulting fire and/or explosion, do not fill fuel containers that are sitting in or on a vehicle or trailer.
The container should be kept tightly closed in order to limit the amount of moisture that gets into the mixture.
The machine‘s fuel tank should be cleaned as necessary.
Fuel mix ages
Only mix sufficient fuel for a few days work,nottoexceed3monthsofstorage. Store in approved fuel-containers only. When mixing, pour oil into the container first, and then add gasoline. Close the container and shake it vigorously by hand to ensure proper mixing of the oil with the fuel.
Gaso- |
Oil (STIHL 50:1 or equiva- |
line |
lent high-quality oils) |
US gal. US fl.oz.
12.6
2 1/2 |
6.4 |
512.8
Dispose of empty mixing-oil containers only at authorized disposal locations.
MM 55, MM 55 C |
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Fueling
232BA046 KN
Before fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank.
Always thoroughly shake the mixture in the canister before fueling your machine.
In order to reduce the risk of burns or other personal injury from escaping gas vapor and fumes, remove the fuel filler capcarefullysoastoallowanypressure build-up in the tank to release slowly.
Afterfueling,tightenfuelcapassecurely as possible by hand.
Starting / Stopping the
Engine
Operating elements
6 5 4
START 
3 
7
2
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002BA036 |
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1 Throttle trigger lockout
2 Throttle trigger
3Slide control
Slide control positions
4START – Start – the ignition is switched on – the engine can be started
5Operating position F– Run – engine is running or can start
6STOP-0 – engine off – ignition is switched off
Symbol on slide control
7h– Stop sign and arrow – to switch offtheengine,pushtheslidecontrol in the direction of the arrow (h) to STOP-0
Starting
NFold out bicycle handle in working position–see"Adjustingthe bicycle handle"
NPressthethrottletriggerlockoutand throttle trigger in succession
N Hold both triggers down
NMove the slide control to START and hold it in position too
NRelease the throttle trigger, slide controlandthrottletriggerlockoutin succession = starting throttle position
9
469BA033 KN
N Set the choke lever (8)
12 |
MM 55, MM 55 C |
g if the engine is cold
eIf the engine is warm – even if the engine has already run but is still cold
NPressthefuelpumpbulb (9)atleast 5 times - even when bulb is filled with fuel
Starting
N Fold in wheels, if present
469BA005 KN |
469BA004 KN
NLay the unit on the ground in a secure position: It must rest on the flangeoftheengineandthesupport ontheframe.Theworkingtoolmust not touch the ground or any other
MM 55, MM 55 C
objects – see also "Starting/stoppingtheengine"inthe MultTool Instruction Manual
NAssume a steady stance – as shown; always stand at the side of the machine – risk of injury by rotating working tool!
NWith the left hand, press the machine firmly against the ground – hand on loop handle
Do not stand or kneel on the shaft!
469BA006 KN |
NGrab the starter grip with your right hand
Version without Easy2Start
NPull the starter grip slowly until you feel it engage and then give it a brisk, strong pull
English
Do not pull out the starter rope completely – risk of breakage!
Version with Easy2Start
NPull the starter grip slowly until you feel it engage and then give it a slow, even pull
Do not pull out the starter rope completely – risk of breakage!
Both versions
NDo not let the starter grip snap back
– guide it slowly back into the housing so that the starter rope can rewind properly
N continue cranking
Whentheenginehasturnedoverforthe first time
469BA034 KN
Nat the latest after the fifth time the starter rope is pulled, move the choke lever (8) to e
N continue cranking
Once the engine is running
NBlip the throttle trigger so that the engine settles down to idle speed
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The machine is now ready for use.
If the carburetor has been set correctly, the working tool should not rotate when the engine is idling!
Switching off the engine
NPush the slide control in the directionofthe arrow(h) toSTOP-0
If the engine does not start
Choke lever
Ifthe chokeleverwasnotreturnedtoe in time after the engine turned over for the first time, then the engine has flooded.
N Set choke lever to e
NMove the throttle trigger, slide controlandthrottletriggerlockoutto the starting throttle position
NStart the engine – to do this, pull starter rope briskly – 10 or 20 pulls may be needed
If the engine still does not start
N Move the slide control to STOP-0
NRemove the spark plug – see "Spark plug"
N Dry spark plug
NCrankthe engineseveraltimeswith thestarter–toclearthecombustion chamber
NReplacethesparkplug–see"Spark plug"
N Move the slide control to F
NSet the choke lever to e– even if the engine is cold
N Restart the engine
Fuel tank run until dry
NAfter refueling, press the fuel pump bulb at least five times – even if it is full of fuel.
NSet the choke lever in accordance with the engine temperature
N Restart the engine
Extra weight
To increase the weight on the MultiTool, the MultiEngine can be retrofitted with an additional weight (special accessory).
Always use original STIHL additional weight. Using other weights can lead to damage to the machine and personal injuries.
Attaching additional weight
No wheels are attached to the MultiEngine
Use the combination wrench to loosen and tighten the weights.
Detach the weights on the side without the square – to do this:
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The weights (1) on the side with the square (2) remain mounted on the bolt.
NUnscrew the hexagon head bolt (3) and remove the outer weight (4)
NDetach the inner weight (5) and remove it from the bolt
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MM 55, MM 55 C |
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NPush additional weight (1) with bolt through the hole (6) in the flange; in the process, rotate it until the square (2) engages in the opening in the flange
NTurn the inner weight (5) onto the bolt and tighten
NFasten outer weight (4) with the hexagon head bolt (3) in the thread of the inner weight and tighten
One or two weights can be mounted on each side of the additional weight as needed.
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The maximum additional weight is 8.8 lbs. (4 kg). Never use higher additional weight. This can cause damage to the machine.
Wheels are attached to the MultiEngine
If wheels (special accessory) – see "Wheels" – are already attached to the MultiEngine, then additional parts are required in order to install the additional weight.
In this case, have the additional weight installed by a servicing dealer.
STIHL recommends that maintenance and repair work be carried out only by authorized STIHL dealers.
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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
Tosimplifyinstallation,turnthemachine so that it rests on the handles.
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469BA035 KN |
NInsert the two sleeves (1) in the frame
N Push the frame onto the flange
MM 55, MM 55 C |
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NInsert the bolt (2) with the washer (3) through the hole (4) in the flange
NFit the washer (3) and tighten it down with the nut (5)
NFasten 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
NThe 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
Ifadditionalweight(specialaccessory)– see "Additional weight" – is already attached to the MultiEngine, then additional parts are required in order to install wheels.
Inthiscase,havethewheelsinstalledby 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.
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469BA036 KN |
N Loosen knob (8)
NEngageknobinthedesiredworking 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 enginetocooldown.Emptythefueltank 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".
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MM 55, MM 55 C |
Replacing the Air Filter
If there is a noticeable loss of engine power
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469BA037 |
N Set choke lever to g
N Remove screw (1)
N Remove filter cover (2)
NRemove coarse dirt from inside the filter cover and around the filter
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469BA038 KN |
N Remove the air filter (3)
NCheck the air filter – replace if necessary
Replace any damaged parts.
NInsert air filter (3) in the filter housing (4)
NRefit the filter cover and screw it down
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Engine Management
Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburation, ignition, timing and valve or port timing) without the addition of any major hardware.
MM 55, MM 55 C |
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Adjusting the Carburetor
The carburetor comes from the factory with a standard setting.
The carburetor has been adjusted for optimum performance and fuel efficiency in all operating states.
The high speed adjusting screw on this carburetor can only be set within narrow limits!
Standard position
N Switch off the engine
N Mount MultiTool
NCheck the air filter – replace if necessary
NHave the spark arrestor (present only in some countries) checked – see "Inspection and maintenance by the servicing dealer"
NTurn the high speed screw (H) counterclockwise as far as possible
– max. 3/4 turn
NCarefully turn the low speed adjustingscrew (L)clockwiseuntilit is firmly seated, then open it 1 turn counterclockwise
NStarttheengine and letitwarmup if necessary
NUsingtheidlespeedscrew (LA),set the idle speed so that the working tool does not move
Fine adjustment
A marginal adjustment of the setting of the high speed adjusting screw (H) may be necessary if the engine does not run satisfactorily in mountain country or at sea level.
Approx. value
Turn the high speed screw (H) approx. 1/4 turn per 1000 m (3300 ft) difference in elevation.
Adjustment conditions
N Adjust to standard setting
NLet the engine warm up for approx. 3 min at full throttle
In the mountains
NTurn the high speed screw (H) clockwise (leaner) – until there is no longer a noticeable increase in speed – max. as far as possible
At sea level
NTurn the high speed screw (H) counterclockwise (richer) – until there is no longer a noticeable increase in speed – max. as far as possible
It is possible that the maximum speed is already obtained at the standard setting.
Setting the idle speed
Whenever the low speed screw (L) has been adjusted, it is usually also necessary to adjust the idle speed adjusting screw (LA).
NLet the engine warm up for approx. 3 min
Engine stops when idling
NSlowly turn idle speed screw (LA) clockwise until the engine runs smoothly–theworkingtoolmustnot move
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MM 55, MM 55 C |
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