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STIHL KM 90 R
{ Instruction Manual
Contents
KombiSystem Guide to Using this Manual
Safety Precautions and Working Techniques
Adjusting the Throttle Cable 4-MIX Engine Fuel
Starting / Stopping the Engine
Operating Instructions Cleaning the Air Filter
Spark Arresting Screen in Muffler Spark Plug
Replacing the Starter Rope and Rewind Spring
Minimize Wear and Avoid Damage 24
Special Accessories Maintenance and Repairs Disposal
EC Declaration of Conformity Quality Certification
{ KM 90 R English Dear Customer, Thank you for choosing a quality engineered STIHL product.
It has been built using modern production techniques and comprehensive quality assurance. Every effort has been made to ensure your satisfaction and troublefree use of the product.
Please contact your dealer or our sales company if you have any queries concerning this product.
Your Dr. Nikolas Stihl This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process with electronic systems.
1
2 English
KombiSystem Guide to Using this Manual
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In the STIHL KombiSystem a number of different KombiEngines and KombiTools can be combined to produce a power tool. In this instruction manual the functional unit formed by the KombiEngine and KombiTools is referred to as the power tool.
Therefore, the separate instruction manuals for the KombiEngine and KombiTool 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.
Pictograms The meanings of the pictograms attached to the machine are explained in this manual.
Depending on the model concerned, the following pictograms may be attached to your machine.
Fuel tank; fuel mixture of gasoline and engine oil Operate decompression valve Manual fuel pump 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 manual.
Operate manual fuel pump Tube of grease Intake air: Summer operation Intake air: Winter operation Handle heating KM 90 R
Safety Precautions and Working Techniques
Special safety precau when working with a power tool.
tions must be observed Always read and and make sure you under stand both instruction manuals (KombiEngine and KombiTool) before using your power tool for the first time and keep them in a safe place for future reference. Non observance of the safety precautions may result in serious or even fatal injury.
Observe all application local safety regulations, standards and ordinances.
If you have not used this type of power tool before: Have your dealer or other experienced user show you how to operate your power tool or attend a special course in its operation.
Minors should never be allowed to use a power tool.
Keep bystanders, especially children, and animals away from the work area.
When the power tool is not in use, shut it off so that it does not endanger others. Secure it against unauthorized use.
The user is responsible for avoiding injury to third parties or damage to their property.
Lend or rent your power tool only to persons who are familiar with this model and its operation – do not lend of rent your power tool without the KombiEngine and KombiTool instruction manuals.
The use of noise emitting power tools may be restricted to certain times by national or local regulations.
To operate the power tool you must be rested, in good physical condition and mental health.
If you have any condition that might be aggravated by strenuous work, check with your doctor before operating a power tool.
Persons with pacemakers only: The ignition system of your power tool produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. STIHL recommends that persons with pacemakers consult their physician and the pacemaker manufacturer to reduce any health risk.
Do not operate the power tool if you are under the influence of any substance (drugs, alcohol) which might impair vision, dexterity or judgment.
Use your power tool only for the applications described in the instruction manual of the KombiTool you are using.
Do not use your power tool for any other purpose because of the increased risk of accidents.
English Do not operate the KombiEngine without a properly mounted KombiTool since this may result in damage to the machine.
Only use KombiTools and accessories that are explicity approved for this power tool by STIHL or are technically identical. It is important that you read the chapter on "Approved KombiTools". If you have any questions in this respect, consult a servicing dealer. Use only high quality parts and accessories in order to avoid the risk of accidents and damage to the machine.
STIHL recommends the use of original STIHL replacement parts. 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 pressure washer to clean your power tool. The solid jet of water may damage parts of the power tool.
Clothing and Equipment Wear proper protective clothing and equipment.
KM 90 R 3
English Avoid clothing that could get caught on branches or brush or moving parts of the machine. Do not wear a scarf, necktie or jewelry. Tie up and con hair net, cap, hard hat, etc.).
fine long hair (e.g. with a See also notes on "Clothing and Equipment" in the instruction manual of the KombiTool you are using.
Transporting the Power Tool Always turn off the engine.
In vehicles: Properly secure your power tool to prevent turnover, fuel spillage and damage.
See also notes on "Transporting the Machine" in the instruction manual of the KombiTool you are using.
Fueling Gasoline is an extremely flammable fuel. Keep clear of naked flames. Do not spill any fuel – do not smoke.
Always shut off the engine before refueling.
Do not fuel a hot engine – fuel may spill and cause a fire.
Open the fuel cap carefully to allow any pressure build-up in the tank to release slowly and avoid fuel spillage.
Fuel your power tool only in well ventilated areas. If you spill fuel, wipe the machine immediately – if fuel gets on your clothing, change immediately.
Your power tool comes standard with either a screw-type or bayonet-type fuel cap. After fueling, tighten down the screw type fuel cap as securely as possible.
Insert the fuel cap with hinged grip (bayonet-type cap) correctly in the opening, turn it clockwise as far as stop and fold the grip down.
This reduces the risk of unit vibrations causing the fuel cap to loosen or come off and spill quantities of fuel.
To reduce the risk of serious or fatal burn injuries, check for fuel leakage. If fuel leakage is found, do not start or run the engine until leak is fixed.
Before Starting Check that your power tool is properly assembled and in good condition – refer to appropriate chapters in the instruction manuals.
–
Use only an approved combination of cutting attachment, deflector, handle and harness. All parts must be assembled properly and securely.
– –
Slide control / stop switch must move easily to STOP or 0 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.
Never attempt to modify the controls or safety devices in any way.
Keep the handles dry and clean – free from oil and dirt – for safe control of the power tool.
Adjust harness and handle to suit your height and reach.
To reduce the risk of personal injury, do not operate your power tool if it is damaged or not properly assembled.
If you use a shoulder strap or full harness: Practice removing and putting down the machine as you would in an emergency. To avoid damage, do not throw the machine to the ground when practicing.
4 KM 90 R
See also notes on "Before Starting" in the instruction manual of the KombiTool you are using.
Starting the Engine Start the engine at least 3 meters from the fueling spot, outdoors only.
Place the unit on firm ground in an open area. Make sure you have good balance and secure footing. Hold the unit securely. The working tool must be clear of the ground and all other obstructions because it may begin to run when the engine starts.
To reduce the risk of injury, avoid contact with the attachment.
Do not drop start the power tool – start the engine as described in the instruction manual. Note that the attachment continues to run for a short period after you let go of the throttle trigger – flywheel effect.
Check idle speed setting: The attachment must be stationary when the engine is idling with the throttle trigger released.
To reduce the risk of fire, keep hot exhaust gases and hot muffler away from easily combustible materials (e.g. wood chips, bark, dry grass, fuel).
See also notes on "Starting / Stopping the Engine" in the instruction manual of the KombiTool you are using.
Holding and Controlling the Power Tool Always hold the power tool firmly with both hands on the handles.
Make sure you always have good balance and secure footing.
Left hand on loop handle, right hand on control handle, even if you are left handed.
During operation In the event of impending danger or in an emergency, switch off the engine immediately by moving the slide control / stop switch to STOP or 0.
The correct engine idle speed is important to ensure that the attachment stops moving when you let go of the throttle trigger. If the working tool continues to move when the engine is idling, have your dealer check the machine and make proper adjustments or repairs. Check and correct the idle speed setting at regular intervals. STIHL recommends you have this work done by a STIHL servicing dealer.
Be particularly alert and cautious when wearing hearing protection because your ability to hear warnings (shouts, alarms, etc.) is restricted.
To reduce the risk of accidents, take a break in good time to avoid tiredness or exhaustion.
English Work calmly and carefully – in daylight conditions and only when visibility is good. Stay alert so as not to endanger others.
Use your power tool only for those applications described in the KombiTool instruction manual.
Your power tool produces toxic exhaust fumes as soon as the engine is running. These fumes may be colorless and odorless and contain unburned hydrocarbons and benzol. Never run the engine indoors or in poorly ventilated loca tions, 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 confined locations.
To reduce the risk of accidents, stop work immediately in the event of nausea, headache, visual disturbances (e.g. reduced field of vision), problems with hearing, dizziness, deterioration in ability to concentrate. Apart from other possibilities, these symptoms may be caused by an excessively high concentration of exhaust gases in the work area.
Operate your power tool so that it produces a minimum of noise and emissions – do not run the engine unnecessarily, accelerate the engine only when working.
KM 90 R 5
English To reduce the risk of fire, do not smoke while operating or standing near your power tool. Note that combustible fuel vapor may escape from the fuel system.
The dusts, vapor and smoke produced during operation may be dangerous to health. Wear a suitable respirator in very dusty or smoky conditions.
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 the fuel system in particular for leaks and make sure the safety devices are working properly. Do not continue operating your power tool if it is damaged. In case of doubt, have the unit checked by your servicing dealer.
Do not operate your power tool in the starting throttle position – engine speed cannot be controlled in this position.
Before leaving the power tool unattended: Shut off the engine.
To reduce the risk of injury, always shut off the engine before changing the KombiTool or working tool.
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 original STIHL replacement parts. They are specifically designed to match your model and meet your performance requirements.
To reduce the risk of injury, always shut off the engine before carrying out any maintenance or repairs or cleaning the machine. – Exception: Carburetor and idle speed adjustments.
Do not turn the engine over on the starter with the spark plug boot or spark plug removed unless the slide control / stop switch is on STOP or 0 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.
Vibration behavior is influenced by the condition of the AV elements – check the AV elements at regular intervals.
6 KM 90 R
Approved KombiTools
FS-KM FS-KM FSB-KM HT-KM FH-KM BF-KM SP-KM FCB-KM FCS-KM KB-KM BG-KM KW-KM
English The following STIHL KombiTools may be mounted on the KombiEngine: KombiTool FS FS HL KM KM FSB KM KM 135° HL KM 0° FH KM 135° BG KM HT KM BF KM FCB KM FCS KM SP KM KB KM KW-KM Purpose Brushcutter with mowing head Brushcutter with grass cutting blade Brushcutter with mowing head Hedge trimmer, adjustable Hedge trimmer Power scythe Blower Pole pruner Cultivator Power edger Power edger Special harvester Bristle brush PowerSweep The barrier bar supplied with the machine must be mounted to the loop handle – see also "Mounting the Loop Handle".
KM 90 R 7
English
Mounting the Loop Handle
A barrier bar is supplied with the machine. Attach the barrier bar to the loop handle.
4 2 A 8 3 5 2 6 7 1 1
N Insert square nuts (1) in the barrier bar (2) – the holes must line up N N N N N Insert the clamp (3) in the loop handle (4) and position them together on the shaft (5) Position clamp (6) Position barrier bar (2) – note position!
Line up the holes Insert bolts (7) in the holes – and screw them into the barrier bar as far as possible
9 4
N N N Fit the loop handle (4) at a distance of (A) approx. 20 cm (8 in) forward of the control handle (8) Orient the loop handle Tighten the bolts – lock the nuts if necessary The sleeve (9) is present depending on the country and must be located between the loop handle and control handle.
Always leave the barrier bar attached.
8 KM 90 R
Adjusting the Throttle Cable
A properly adjusted throttle cable is the precondition for correct operation in the full throttle, starting throttle and idle positions.
N Adjust the throttle cable only when the unit is completely and properly assembled.
N Use a suitable tool to push the slide to the end of the slot (see illustration).
1
4-MIX Engine
The STIHL 4-MIX engine features mixture lubrication and must be run on a fuel mixture of gasoline and engine oil.
It operates otherwise on the 4-stroke principle.
English
Fuel
The engine requires a mixture of gasoline and engine oil.
WARNING Avoid direct skin contact with and breathing in of gasoline fumes.
STIHL MotoMix STIHL recommends using STIHL MotoMix. This pre-blended fuel is free of benzene and lead, stands out because of a high octane rating, and always provides the proper mixing ratio.
STIHL MotoMix is blended with STIHL HP Ultra two-stroke engine oil for maximum engine life. MotoMix is not available in all markets.
Mixing fuel N
2
Press down the throttle trigger lockout (1) and squeeze the throttle trigger (2) (full throttle) – this sets the throttle cable correctly.
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 poor 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.
KM 90 R 9
English Unleaded gasoline must be used in machines equipped with a catalytic converter.
NOTICE Using multiple tankfuls of leaded gasoline can substantially reduce the effectiveness of the catalytic converter.
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 25% (E25).
Engine oil Use only high-quality two-stroke engine oil – ideally STIHL HP, HP Super or HP Ultra two-stroke engine oil, as they are specially engineered for STIHL engines. HP Ultra ensures maximum performance and engine life.
The engine oils are not available in all markets.
Only STIHL two-cycle engine oil 1:50 may be used to produce the fuel mixture for machines with a catalytic converter.
Mixing ratio for STIHL two-cycle engine oil 1:50; 1:50 = 1 part oil + 50 parts gasoline Examples 10 15 20 25 Quantity of gasoline Liters 1 5 N STIHL two-cycle engine oil 1:50 Liters (ml) 0.02
0.10
0.20
0.30
0.40
0.50
(20) (100) (200) (300) (400) (500) 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 ages – mix only as much as needed for a few weeks. Do not store fuel mixture for longer than three months. The fuel mixture can become unusable faster if exposed to light, sunlight or low or high temperatures.
N Shake the canister containing the fuel mixture thoroughly before refueling WARNING Pressure can build up inside the canister – open carefully.
N 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 regulations and without harming the environment!
10 KM 90 R
Fueling
Preparations Threaded filler cap Opening the cliplock filler cap English Refueling Take care not to spill fuel while fueling and do not overfill the tank. STIHL recommends use of the STIHL filling system (special accessory).
Closing the cliplock filler cap N Before fueling, clean the filler cap and the area around it so that dirt cannot fall into the tank.
N Always position the machine so that the filler cap is facing upwards.
A number of different filler caps are installed as standard at the factory.
N Swing the clip into an upright position N N Position the cap with the clip in an upright position; the markings must line up Turn cap clockwise as far as it will go (approx. 1/4 turn) Cliplock filler cap (bayonet-type) KM 90 R N N Turn the cap counterclockwise (approx. 1/4 turn) Remove the filler cap N Fold the cliplock down so that it is flush with the surface If the cliplock is not flush with the surface and the lug on the clip does not engage entirely in the recess (arrow), the cap is not properly closed and the steps described above must be repeated.
11
English Opening screw-type tank cap
Starting / Stopping the Engine
Controls
7 4
STOP N N 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
2 1 3 5 6
N N Place the cap in the opening.
Turn the cap clockwise as far as stop and tighten it down as firmly as possible by hand.
1 2 3 Throttle trigger lockout Throttle lever Slide control Positions of slide control 4 5 6 STOP-0 – engine off – the ignition is switched off F – normal run position – the engine is running or can start START – the ignition is switched on – the engine can start Symbol on slide control 7 h – stop symbol and arrow. To stop the engine, push the slide control in the direction of the arrow on the stop symbol ( h ) to STOP-0.
Starting N N N N Press down the trigger lockout lever and squeeze the throttle trigger.
and hold them in that position.
Move the slide control to START and hold it there.
Now release the throttle trigger, slide control and trigger lockout in that order. This is the starting throttle position.
9 8
N Set the choke knob (8) 12 KM 90 R
English g e N if the engine is cold for warm start – also use this posi but is still cold.
tion if the engine has been running Press the fuel pump bulb (9) at least five times – even if the bulb is already filled with fuel.
Starting NOTICE Do not stand or kneel on the drive tube.
N N N Place the power tool on the ground so that it rests on the machine support: Check that the working tool is not touching the ground or any other obstacles – see also "Starting / Stopping the Engine" in the KombiTool instruction manual.
Make sure you have a safe and secure footing.
Hold the unit with your left hand and press it down firmly – your thumb should be under the fan housing.
N N Hold the starter grip with your right hand.
Pull the starter grip slowly until you feel it engage and then give it a brisk strong pull.
NOTICE Do not pull out the starter rope all the way – it might otherwise break.
N Do not let the starter grip snap back. Guide it slowly back into the housing so that the starter rope can rewind properly.
N N Continue cranking.
After no more than five pulls, move the choke knob to e .
When the engine begins to fire: N Continue cranking.
As soon as the engine runs N Blip the throttle trigger immediately. The slide control moves to the normal run position F – and the engine settles down to idle speed.
WARNING Make sure the carburetor is correctly adjusted. The working tool must not move when the engine is idling.
Your machine is now ready for operation.
Stopping the engine N Push the slide control in the direction of the arrow on the stop symbol ( h ) to STOP-0.
At very low outside temperatures: As soon as the engine runs: N Blip the throttle trigger to disengage the starting throttle position. The slide control moves to the normal run position ( F ) – and the engine settles down to idle speed.
N N Open the throttle slightly.
Warm up the engine for a short period.
If the engine does not start Choke knob If you did not turn the choke knob to e fire, the combustion chamber is flooded.
quickly enough after the engine began to KM 90 R 13
English N N N Turn the choke knob to e Set the slide control, lockout lever and throttle trigger to the starting throttle position.
Start the engine by pulling the starter rope briskly – 10 to 20 pulls may be necessary. If the engine still does not start N Move the slide control to STOP-0.
N N N N N N N Remove the spark plug – see "Spark Plug".
Dry the spark plug.
Crank the engine several times with the starter to clear the combustion chamber.
Refit the spark plug – see "Spark Plug".
Move the slide control to START.
Set the choke knob to e – even if the engine is cold.
Now start the engine.
Throttle cable adjustment N Check adjustment of throttle cable – see chapter on "Adjusting the Throttle Cable".
Fuel tank run until completely dry N N N After refueling, press the fuel pump bulb at least five times – even if the bulb is filled with fuel.
Set the choke knob according to engine temperature.
Start the engine.
Operating Instructions Cleaning the Air Filter
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 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".
If there is a noticeable loss of engine power
4 2 1
N N N N N N Turn the choke knob to g Take out the screw (1) and remove the filter cover (2). Clean away loose dirt from around the filter.
Grip the filter element (3) at the cutout (arrow) in the filter housing (4) and remove it.
Fit a new filter element. As a temporary measure you can knock it out on the palm of your hand or blow it out with compressed air. Do not wash.
Replace damaged parts.
Installing the filter N N Install the filter element in the filter housing and fit the cover.
Insert the screw and tighten it down firmly.
14 KM 90 R
English
Adjusting the Carburetor
The carburetor comes from the factory with a standard setting.
This setting provides an optimum fuel-air mixture under most operating conditions.
These power tools are equipped with different carburetors: Version A
H L LA –
High speed screw and low speed screw with special head – without slotted head.
On these machine versions it is no longer necessary to adjust the carburetor. These machines have been set at the factory to provide an optimum fuel-air mixture in all locations and operating conditions.
Adjusting Idle Speed Engine stops while idling
H L LA
N N Warm up the engine for about 3 minutes.
Turn the idle speed screw (LA) slowly clockwise until the engine runs smoothly – the cutting attachment must not move.
Cutting attachment runs when engine is idling N Turn the idle speed screw (LA) counterclockwise until the cutting attachment stops running and then turn the screw about another 1/2 to 3/4 turn in the same direction.
WARNING If the working tool or cutting attachment continues to run when the engine is idling, have your machine checked and repaired by your servicing dealer.
Version B
H L LA –
High speed screw and low speed screw with slotted head.
With this carburetor it is only possible to adjust the high speed and low speed screws within fine limits. Standard Setting N Stopping the Engine N N N N Mount the KombiTool complete with working tool or cutting attachment.
Check the air filter and clean or replace as necessary.
Check that the throttle cable is properly adjusted – readjust if necessary – see chapter on "Adjusting the Throttle Cable".
Check the spark arresting screen (not in all versions) and clean or replace as necessary.
KM 90 R 15
English
H L LA
N
– –
N N Carefully turn both adjusting screws counterclockwise as far as stop: The high speed screw (H) is 3/4 turn open. The low speed screw (L) is 3/4 turn open.
Start and warm up the engine.
Adjust idle speed with the idle speed screw (LA) so that the cutting attachment does not move.
Adjusting Idle Speed It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L).
N Warm up the engine for about 3 minutes.
Engine stops while idling N Turn the idle speed screw (LA) slowly clockwise until the engine runs smoothly – the cutting attachment must not move.
Cutting attachment runs when engine is idling N Turn the idle speed screw (LA) counterclockwise until the cutting attachment stops running and then turn the screw about another 1/2 to 3/4 turn in the same direction.
16 WARNING If the working tool or cutting attachment continues to run when the engine is idling, have your machine checked and repaired by your servicing dealer.
Erratic idling behavior, engine stops even though setting of LA screw has been corrected, poor acceleration Idle setting is too lean: N Turn the low speed screw (L) counterclockwise, no further than stop, until the engine runs and accelerates smoothly.
Erratic idling behavior Idle setting is too rich N Turn the low speed screw (L) clockwise, no further than stop, until the engine runs and accelerates smoothly.
Version B: Fine Tuning A slight correction of the setting of the high speed screw (H) may be necessary if engine power is not satisfactory when operating at high altitude, sea level or after changing the working tool.
Rule of thumb: Turn the high speed screw (H) about one quarter turn for every 1000m (3300 ft) change in altitude.
Conditions for adjustment N N N Carry out the standard setting without disturbing the high speed screw (H).
Warm up the engine for about 3 minutes.
Open the throttle wide.
At high altitude N Turn the high speed screw (H) clockwise (leaner), no further than stop, until there is no further noticeable increase in engine speed.
At sea level N Turn the high speed screw (H) counterclockwise (richer), no further than stop, until there is no noticeable increase in engine speed.
It is possible that maximum engine speed may be reached with the standard setting.
KM 90 R
Spark Arresting Screen in Muffler
In some countries the muffler is equipped with a spark arresting screen.
N N N If the engine is down on power, check the spark arresting screen in the muffler.
Wait for the muffler to cool down.
Move the slide control to STOP 0.
1
N N N N N N Take out the screw (4).
Lift the spark arresting screen (5) and pull it out.
Clean the spark arresting screen. If the screen is damaged or heavily carbonized, fit a new one.
Refit the spark arresting screen.
Insert the screw and tighten it down firmly.
Fit the shroud.
N Take out the screw (1).
English
Spark Plug
N N If the engine is down on power, difficult to start or runs poorly at idle speed, first check the spark plug.
Fit a new spark plug after about 100 operating hours – or sooner if the electrodes are badly eroded. Install only suppressed spark plugs of the type approved by STIHL – see "Specifications".
Removing the spark plug N Move the slide control to STOP-0.
1 3
N
2 2
Take out the screws (2) and remove the shroud (3).
N N Pull off the spark plug boot (1).
Unscrew the spark plug.
KM 90 R 17
English Checking the spark plug Installing the spark plug
Replacing the Starter Rope and Rewind Spring
Replacing the Starter Rope
2 A
N N Clean dirty spark plug.
Check electrode gap (A) and readjust if necessary – see "Specifications".
N Rectify the problems which have caused fouling of the spark plug.
Possible causes are:
– – –
Too much oil in fuel mix.
Dirty air filter.
Unfavorable running conditions.
1 3 1 2 1
N Screw the spark plug (3) into the cylinder and fit the boot (2) (press it down firmly).
1
N N N Push the slide control in direction of arrow h – to STOP-0.
Take out the screws (1).
Remove the starter cover (2) from the housing.
WARNING If the spark plug comes with a detachable adapter nut (1), screw the adapter onto the thread and tighten it down firmly to reduce the risk of arcing and fire.
18 KM 90 R
4 3 5 6 4 3 5
English N N N Ease the spring clip (3) off the starter post.
Remove the rope rotor with washer (4) and pawl (5).
Remove the remaining rope from the rotor and starter grip.
N Tie a simple overhand knot in the new rope and then thread it through the top of the grip and the rope bushing (6).
N N N Thread the rope through the rotor and secure it with a simple overhand knot.
Coat the rope rotor bearing bore with non-resinous oil.
Slip the rotor over the starter post – turn it back and forth to engage the anchor loop of the rewind spring.
N N N N Refit the pawl (5) in the rotor.
Fit the washer (4) on the starter post.
Use a screwdriver or suitable pliers to fit the spring clip (3) on the starter post and over the pawl's peg – the spring clip must point counterclockwise – as shown in the illustration.
Go to "Tensioning the Rewind Spring".
Replacing a broken rewind spring N Remove the rope rotor as described in chapter on "Replacing the starter rope".
KM 90 R 19
English WARNING The bits of spring may still be under tension and could fly apart when you take them out of the housing. To reduce the risk of injury, wear face protection and work gloves.
N N Remove the spring housing and pieces of spring.
Lubricate the new spring with a few drops of non-resinous oil.
N N Reinstall the rope rotor – then go to "Tensioning the Rewind Spring".
If the spring pops out of the spring housing and uncoils: Refit it counterclockwise, starting outside and working inwards.
Tensioning the rewind spring N N N When the starter rope is fully extended it must still be possible to rotate the rotor another half turn. If this is not the case, the spring is overtensioned and could break. Take one turn of the rope off the rotor.
Fit the starter cover on the housing.
Tighten down the screws firmly.
N N Position the new spring housing, bottom plate facing up, against the cutouts (arrows). Push the spring housing into the starter cover.
N N N N Make a loop in the unwound starter rope and use it to turn the rope rotor six full revolutions in the direction of the arrow.
Hold the rotor steady. Pull out and straighten the twisted rope.
Let go of the rotor.
Release the rope slowly so that it winds onto the rotor. The starter grip must locate firmly in the rope bushing. If the grip droops to one side: Add one more turn on the rope rotor to increase spring tension.
20 KM 90 R
Storing the Machine
For periods of 3 months or longer N N N N Drain and clean the fuel tank in a well ventilated area.
Dispose of fuel properly in accordance with local environmental requirements.
Run the engine until the carburetor is dry – this helps prevent the carburetor diaphragms sticking together.
Thoroughly clean the machine – pay special attention to the cylinder fins and air filter.
N N Remove, clean and inspect the working tool.
Store the machine in a dry, high or locked location, out of the reach of children and other unauthorized persons.
KM 90 R English 21
English
Maintenance and Care
The following intervals apply to normal operating conditions only. If your daily work ing time is longer or operating conditions are difficult (very dusty work area, etc.), shorten the specified intervals accordingly.
Complete machine Control handle Air filter Pickup body in fuel tank Fuel tank Carburetor Spark plug Cooling inlets Valve clearance 1) Combustion chamber 1) Spark arresting screen 2) in muffler Visual inspection (condition, leaks) Clean Check operation Clean Replace Have checked by dealer 1) Have replaced by dealerer 1) Clean Check idle adjustment – the working tool must not move Adjusting Idle Speed Readjust electrode gap Replace after every 100 operating hours Visual inspection Clean Check and, if necessary, have adjusted by dealer after first 139 hours of operation Decoke after first 139 hours of opera tion, then every 150 hours of operation Check Clean or replace X X X X X X X X X 22 X X X X X X X X X X X X X X X X X KM 90 R
The following intervals apply to normal operating conditions only. If your daily work ing time is longer or operating conditions are difficult (very dusty work area, etc.), shorten the specified intervals accordingly.
All accessible screws and nuts (not adjust ing screws) Retighten Antivibration elements Check Have replaced by dealer 1) Safety labels 1) 2) not in all versions, market-specific Replace STIHL recommends a STIHL servicing dealer.
X English X X X X X KM 90 R 23
English
Minimize Wear and Avoid Damage
Observing the instructions in this manual helps reduce the risk of unnecessary wear and damage to the power tool.
The power tool must be operated, maintained and stored with the due care and attention described in this owner's manual.
The user is responsible for all damage caused by non-observance of the safety precautions, operating and maintenance instructions in this manual. This includes in particular:
–
Alterations or modifications to the product not approved by STIHL.
– – – –
Using tools or accessories which are neither approved or suitable for the product or are of a poor quality.
Using the product for purposes for which it was not designed.
Using the product for sports or competitive events.
Consequential damage caused by continuing to use the product with defective components.
Maintenance Work All the operations described in the "Maintenance Chart" must be performed on a regular basis. If these maintenance operations cannot be performed by the owner, they should be performed by a servicing dealer.
STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.
If these maintenance operations are not carried out as specified, the user assumes responsibility for any damage that may occur. Among other parts, this includes:
– – –
Damage to the engine due to neglect or deficient maintenance (e.g. air and fuel filters), incorrect carburetor adjustment or inadequate cleaning of cooling air inlets (intake ports, cylinder fins).
Corrosion and other consequential damage resulting from improper storage.
Damage to the machine resulting from the use of poor quality replacement parts.
Parts Subject to Wear and Tear Some parts of the power tool are subject to normal wear and tear even during regular operation in accordance with instructions and, depending on the type and duration of use, have to be replaced in good time. Among other parts, this includes:
–
Clutch
–
Filters (air, fuel)
– –
Rewind starter Spark plug 24 KM 90 R
Main Parts
7 6 9 8 2 3 4 1 # 5 10 11 13 12 15 14 16 17 18
English 1 2 3 4 Fuel filler cap Carburetor adjusting screws Fuel pump Starter grip 5 6 7 Muffler (some versions with spark arresting screen) Coupling sleeve Wing screw 8 9 # Loop handle Barrier bar 10 Carrying ring 11 Slide control 12 Throttle trigger interlock 13 Throttle trigger 14 Spark plug boot 15 Choke knob 16 Air filter cover 17 Fuel tank 18 Machine support Serial number KM 90 R 25
English
Specifications
Engine Single cylinder four-stroke engine with mixture lubrication Displacement: Bore: Stroke: 28.4 cm 38 mm 25 mm 3 Engine power to ISO 8893: Exhaust valve: 0.95 kW (1.3 HP) at 7,000 rpm Idle speed: Cut-off speed (rated): 10,500 rpm Valve clearance Inlet valve: 2,800 rpm 0.10 mm 0.10 mm Ignition System Electronic magneto ignition Spark plug (resistor type): Electrode gap: Bosch USR 7 AC 0.5 mm Fuel System All position diaphragm carburetor with integral fuel pump Fuel tank capacity: 0.53 l Weight dry, without KombiTool KM 90 R: 4.5 kg Noise and Vibration Data For further details on compliance with Vibration Directive 2002/44/EC see www.stihl.com/vib/ KombiTool For version see "Approved KombiTools".
Noise and vibration data measurements include idling and rated maximum speed in the following ratios.
FCS KM, FCB KM, FS KM, FSB-KM, FH KM and HT KM 1:1 HL KM 1:4 BF KM, KB KM, KW KM, BG KM and SP KM 1:6 Sound pressure level L peq to EN ISO 11201, ISO 22868 KM 90 R: 88 dB(A) ... 97 dB(A) Sound power level L weq to ISO 22868, ISO 3744 KM 90 R: 99 dB(A) ... 106 dB(A) Vibration measurement a hv,eq to ISO 8662 Handle, left KM 90 R: 3.1 m/s 2 ... 6.8 m/s 2 Handle, right KM 90 R: 4.1 m/s 2 ... 7.0 m/s 2 The K factor in accordance with Directive 2006/42/EC is 2.5 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/s 2 for the vibration measurement.
REACH REACH is an EC regulation and stands for the Registration, Evaluation, Authorisation and Restriction of Chemical substances.
For information on compliance with the REACH regulation (EC) No. 1907/2006 see www.stihl.com/reach.
26 KM 90 R
Special Accessories
– – –
Safety glasses Shoulder strap Full harness
– – –
Combination wrench Carburetor screwdriver Special resin-free lubricating oil See also notes on special accessories in the KombiTool instruction manual.
Contact your STIHL dealer for more information on these and other special accessories.
Maintenance and Repairs
Users of this machine may only carry out the maintenance and service work described in this user manual. All other repairs must be carried out by a servicing dealer.
STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.
When repairing the machine, only use replacement parts which have been approved by STIHL for this power tool or are technically identical. Only use 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 parts).
K (the symbol may appear alone on small English
Disposal
Observe all country-specific waste disposal rules and regulations.
STIHL products must not be thrown in the garbage can. Take the product, accessories and packaging to an approved disposal site for environment friendly recycling.
Contact your STIHL servicing dealer for the latest information on waste disposal.
KM 90 R 27
English
EC Declaration of Conformity
ANDREAS STIHL AG & Co. KG Badstr. 115 D-71336 Waiblingen confirms that the product described below Category: Make: Model: Serial identification: Displacement: KombiEngine STIHL KM 90 R 4180 28.4 cm 3 conforms to the specifications of Directives 2006/42/EC and 2004/108/EC and has been developed and manufactured in compliance with the following standards:.
EN ISO 12100, EN 55012, EN 61000 6 1 (in conjunction with the following KombiTools: BF KM, BG KM, FCB KM, FCS KM, FH-KM, FS KM, FSB KM, HL KM, HT KM, KB-KM, KW KM and SP-KM).
The KombiEngine described here may be operated only in conjunction with the KombiTools approved by STIHL for use with this KombiEngine.
Technical documents deposited at: ANDREAS STIHL AG & Co. KG Produktzulassung (Product Licensing) The year of manufacture and serial number are applied to the product.
Done at Waiblingen, 01.08.2112
ANDREAS STIHL AG & Co. KG Thomas Elsner Director Group Product Management
Quality Certification
All STIHL products comply with the highest quality standards.
An independent organization has certified that all products manufactured by STIHL meet the strict requirements of the ISO 9001 standard for quality management systems in terms of product development, materials purchasing, production, assembly, documentation and customer service.
28 KM 90 R
0458-465-0121-C
englisch
G
www.stihl.com
*04584650121C*
0458-465-0121-C
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