Stihl Km 91 r User manual

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STIHL KM 91 R Instruction Manual

Notice d’emploi

GInstruction Manual

1 - 23

FNotice d’emploi

24 - 49

Original Instruction ManualPrinted on chlorine-free paper

Printing inks contain vegetable oils, paper can be recycled.

0458-468-8221-A. VA1.A17.

0000007505_002_GB

KM 91 R

English

with electronic systems.

Contents

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

KombiSystem 2

Guide to Using this Manual 2

Safety Precautions and Working

Techniques 3

Approved KombiTools 8

Mounting the Loop Handle 8

Adjusting the Throttle Cable 9

Fuel 9

Fueling 11

Starting / Stopping the Engine 11

Operating Instructions 13

Replacing the Air Filter 14

Engine Management 14

Adjusting the Carburetor 14

Spark Arresting Screen in Muffler 15

Spark Plug 15

Storing the Machine 16

Maintenance and Care 17

Main Parts 19

Specifications 20

Maintenance and Repairs 21

Disposal 21

STIHL Limited Emission Control

Warranty Statement 22

KM 91 R

English

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 KombiTool 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.

Symbols in text

WARNING

Warning where there is a risk of an

accident or personal injury or serious

damage to property.

NOTICE

Caution where there is a risk of

damaging the machine or its individual

components.

Engineering improvements

STIHL's philosophy is to continually

improve all of its products. For this

reason we may modify the design,

engineering and appearance of our

products periodically.

Therefore, some changes, modifications

and improvements may not be covered

in this manual.

KombiSystem Guide to Using this Manual

Fuel tank; fuel mixture of

gasoline and engine oil

Operate decompression

valve

Manual fuel pump

Operate manual fuel

pump

Tube of grease

Intake air: Summer

operation

Intake air: Winter

operation

Handle heating

KM 91 R

English

Observe all applicable 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 it is

operated 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 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.

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 explicitly 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 tools and accessories in order to

avoid the risk of accidents and damage

to the machine.

STIHL recommends the use of genuine

STIHL tools and accessories. They are

specifically designed to match the

product and meet your performance

requirements.

Never attempt to modify your machine 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.

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.

Models with loop handle

Left hand on loop handle, right hand on

control handle, even if you are left-

handed.

During Operation

In the event of imminent danger or in an

emergency, switch off the engine

immediately – operate the stop switch.

The correct engine idle speed is

important to ensure that the attachment

stops moving when you let go of the

throttle trigger. If the attachment

continues to run when the engine is

idling, have your dealer check your

machine and make proper adjustments

or repairs. Check and correct the idle

speed setting regularly. STIHL

recommends an authorized 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.

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 in the areas

specified in the KombiTool instruction

manual.

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.

0000-GXX-0492-A0

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.

KM 91 R

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, consult

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 attachment.

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 from

unintentional engine startup, always

shut off the engine and disconnect the

spark plug boot before performing any

repairs, maintenance or cleaning work. –

Exception: Carburetor and idle speed

adjustments.

Do not turn the engine over on the

starter with the spark plug boot or spark

plug removed since there is otherwise a

risk of fire from uncontained sparking.

To reduce the risk of fire, do not service

or store your machine near open flames.

Check the fuel filler cap for leaks at

regular intervals.

Use only a spark plug of the type

approved by STIHL and make sure it is

in good condition – see "Specifications".

Inspect the ignition lead (insulation in

good condition, secure connection).

Check the condition of the muffler.

To reduce the risk of fire and damage to

hearing, do not operate your machine if

the muffler is damaged or missing. –

Do not touch a hot muffler since burn

injury will result.

Vibration behavior is influenced by the

condition of the AV elements – check the

AV elements at regular intervals.

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

KM 91 R

English

warranty claim for a component which

has not been serviced or maintained

properly or if nonapproved replacement

parts were used, STIHL may deny

coverage.

For any maintenance please refer to the

maintenance chart and to the warranty

statement near the end of the instruction

manual.

KM 91 R

English

The following STIHL KombiTools may

be mounted on the KombiEngine:

A barrier bar is supplied with the

machine. Attach the barrier bar to the

loop handle.

NInsert square nuts (1) in the barrier

bar (2) – the holes must line up

NInsert the clamp (3) in the loop

handle (4) and position them

together on the shaft (5)

NPosition clamp (6)

NPosition barrier bar (2) – note

position!

NLine up the holes

NInsert bolts (7) in the holes – and

screw them into the barrier bar as

far as possible

Approved KombiTools

KombiTool

1) the barrier bar on the loop handle

supplied with the machine must be

used – see also "Mounting the Loop

Handle"

Application

FS-KM Brushcutter with

mowing head

FS-KM 1) Brushcutter with

grass cutting blade

FSB-KM Brushcutter with

mowing head

HL-KM 145° Long reach hedge

trimmer, adjustable

HL-KM 0° Long reach hedge

trimmer

FH-KM 145° Power scythe

BG-KM Blower

HT-KM Pole pruner

BF-KM Cultivator with pick

tines

FBD-KM Redefining bed

edges

FCB-KM Lawn edging

FCS-KM Lawn edging

KB-KM Bristle brush

KW-KM PowerSweep

Mounting the Loop Handle

002BA098 KN

002BA099 KN

KM 91 R

English

NFit the loop handle (4) at a distance

of (A) approx. 20 cm (8 in) forward

of the control handle (8)

NOrient the loop handle

NTighten 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.

It may be necessary to correct the

adjustment of the throttle cable after

assembling the machine or after a

prolonged period of operation.

Adjust the throttle cable only when the

unit is completely and properly

assembled.

NSet the throttle trigger to the full

throttle position.

NCarefully rotate the screw in the

throttle trigger in the direction of the

arrow until you feel initial resistance.

Then rotate it another half turn in the

same direction.

This engine is certified to operate on

unleaded gasoline and the STIHL two-

stroke engine oil at a mix ratio of 50:1.

Your engine requires a mixture of high-

quality gasoline and two-stroke air

cooled engine oil.

Use mid-grade unleaded gasoline with a

minimum octane rating of 89 ((R+M)/2)

and no more than 10% ethanol content.

Fuel with an octane rating below 89 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.), but magnesium castings and

catalytic converters as well. This could

cause running problems or damage the

engine. For this reason STIHL

recommends that you use only quality

unleaded gasoline!

Gasoline with an ethanol content of

more than 10% can cause running

problems and major damage in engines

and should not be used.

For further details, see

www.STIHLusa.com/ethanol

The ethanol content in gasoline affects

engine speed – it may be necessary to

readjust the carburetor if you use fuels

with various ethanol contents.

002BA353 KN

Adjusting the Throttle Cable

002BA655 KN

Fuel

KM 91 R

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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´s idle speed is

incorrectly adjusted, have your

authorized STIHL servicing dealer

check your machine and make the

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.

To ensure the maximum performance of

your STIHL engine, use a high quality 2-

cycle engine oil, such as STIHL 2-cycle

engine oils. STIHL 2-cycle engine oils

are specially designed for STIHL

engines. To help your engine run

cleaner and reduce harmful carbon

deposits, STIHL recommends using

STIHL HP Ultra 2-cycle engine oil, or

use an equivalent high quality 2-cycle

engine oil.

To meet the requirements of EPA and

CARB we recommend to use STIHL HP

Ultra oil or equivalent.

Do not use BIA or TCW rated (two-

stroke water cooled) mix oils or other

mix oils that state they are for use in both

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

container on the ground before filling. To

reduce the risk of sparks from static

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.

STIHL MotoMix

STIHL recommends the use of STIHL

MotoMix. STIHL MotoMix has a high

octane rating and ensures that you

always use the right gasoline/oil mix

ratio.

STIHL MotoMix uses STIHL HP Ultra

two-stroke engine oil suited for high

performance engines.

For further details, see

www.STIHLusa.com/ethanol

Fuel mix ages

If not using STIHL MotoMix, only mix

sufficient fuel for a few days of work, not

to exceed 30 days of storage. 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 mix of oil and

gasoline.

Dispose of empty mixing-oil containers

only at authorized disposal locations.

Gasoline Oil (STIHL 50:1 or equiva-

lent high-quality oils)

Liters Liters (ml)

1 0.02 (20)

5 0.10 (100)

10 0.20 (200)

20 0.40 (400)

US gal. US fl.oz.

12.6

2 1/2 6.4

512.8

KM 91 R

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Preparations

NBefore fueling, clean the filler cap

and the area around it to ensure that

no dirt falls into the tank.

NPosition the machine so that the

tank cap faces up.

Opening the filler cap

NTurn the cap counterclockwise until

it can be removed from the tank

opening.

NRemove 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 for fuel (special accessory).

NFill up with fuel.

Closing the filler cap

NPlace the cap in the opening.

NTurn the cap clockwise as far as

stop and tighten it down as firmly as

possible by hand.

Controls

1Throttle trigger lockout

2Throttle trigger

3Stop switch with Run and Stop

positions. Depress the stop switch

(…) to switch off the ignition – see

"Function of stop switch and ignition

system".

Function of stop switch and ignition

system

The ignition is switched off and the

engine stopped when the stop switch is

pressed. 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.

Fueling

266BA028 KN

2709BA003 KN

2709BA004 KN

Starting / Stopping the

Engine

0000-GXX-0477-A0

KM 91 R

English

Starting the Engine

NPress the manual fuel pump

bulb (9) at least five times – even if

the bulb is already filled with fuel.

NPress in the choke knob (8) and turn

it to the position that suits the engine

temperature:

The choke knob must engage in

position.

Cranking

NPlace 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.

NMake sure you have a safe and

secure footing.

NHold the unit with your left hand and

press it down firmly – your thumb

should be under the fan housing.

NOTICE

Do not stand or kneel on the drive tube.

NHold the starter grip with your right

hand.

NPull 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.

NDo not let the starter grip snap back.

Guide it slowly back into the housing

so that the starter rope can rewind

properly.

NContinue cranking until the engine

runs.

As soon as the engine runs

NPress down the throttle trigger

lockout and open the throttle – the

choke knob moves to the run

gif the engine is cold

<for warm start – also use this posi-

tion if the engine has been running

but is still cold.

0000-GXX-0478-A0

0000-GXX-1674-A0

0000-GXX-1319-A0

0000-GXX-1318-A0

0000-GXX-1558-A0

KM 91 R

English

position F. After a cold start, warm

up the engine by opening the

throttle several times.

WARNING

There is a risk of injury if the KombiTool

runs when the engine is idling. Adjust

the carburetor so that the KombiTool

does not run when the engine is idling –

see “Adjusting the Carburetor”.

Your machine is now ready for

operation.

Stopping the Engine

NDepress the momentary contact

stop switch – the engine stops –

release the stop switch – it springs

back to the run position.

Other Hints on Starting

Engine stalls in cold start position g or

under acceleration.

NMove the choke knob to < and

continue cranking until the engine

runs.

Engine does not start in warm start

position <

NMove the choke knob to g and

continue cranking until the engine

runs.

If the engine does not start

NCheck that all settings are correct.

NCheck that there is fuel in the tank

and refuel if necessary.

NCheck that the spark plug boot is

properly connected.

NRepeat the starting procedure.

Engine is flooded

NMove the choke knob to F and

continue cranking until the engine

runs.

Fuel tank run until completely dry

NAfter refueling, press the manual

fuel pump bulb at least five times –

even if the bulb is already filled with

fuel.

NSet the choke lever to suit the

engine temperature.

NNow start the engine.

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".

Operating Instructions

KM 91 R

English

Filters have an average life of more than

a year. Do not remove the filter cover or

replace the air filter as long as there is no

noticeable loss of power.

If there is a noticeable loss of engine

power

NTurn the choke knob to g.

NLoosen the screws (1).

NRemove the filter cover (2).

NClean away loose dirt from around

the filter.

NRemove the filter element (3).

NReplace dirty or damaged filter

element (3).

NReplace any damaged parts.

Installing the Filter Element

NInstall the filter element (3) in the

filter housing and fit the cover.

NInsert the screws (1) and tighten

them down firmly.

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.

The carburetor has been set at the

factory to provide an optimum fuel-air

mixture under most operating

conditions.

Adjusting Idle Speed

Engine stops while idling

NWarm up the engine for about

3 minutes.

NTurn the idle speed screw (LA)

slowly clockwise until the engine

runs smoothly – the attachment

must not run.

Attachment runs when engine is idling

NTurn the idle speed screw (LA)

slowly 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 attachment continues to run when

the engine is idling, have your machine

checked and repaired by your servicing

dealer.

Replacing the Air Filter

0000-GXX-0482-A0

Engine Management Adjusting the Carburetor

0000-GXX-0495-A0

KM 91 R

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NIf the engine is down on power,

check the spark arresting screen in

the muffler.

NWait for the muffler to cool down.

NTake out the screw (4).

NLift the spark arresting screen (5)

and pull it out.

NClean the spark arresting

screen (5). If the screen is damaged

or heavily carbonized, install a new

one.

NRefit the spark arresting screen (5).

NInsert the screw (4) and tighten it

down firmly.

NIf the engine is down on power,

difficult to start or runs poorly at idle

speed, first check the spark plug.

NFit 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

NRemove the cover (1).

NPull off the spark plug boot (2).

NUnscrew the spark plug (3).

Checking the Spark Plug

NClean dirty spark plug.

NCheck electrode gap (A) and

readjust if necessary – see

"Specifications".

NRectify 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.

WARNING

Arcing may occur if the adapter nut (1) is

loose or missing. Working in an easily

combustible or explosive atmosphere

may cause a fire or an explosion. This

can result result in serious injuries or

damage to property.

Spark Arresting Screen in

Muffler

0000-GXX-0486-A0

Spark Plug

0000-GXX 0537-A0

000BA039 KN

000BA045 KN

KM 91 R

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NUse resistor type spark plugs with a

properly tightened adapter nut.

Installing the Spark Plug

NScrew the spark plug (3) into the

cylinder.

NTighten down the spark plug (3) with

the combination wrench.

NPress the boot (2) firmly onto the

spark plug.

NFit the cover (1) and screw it down

firmly.

For periods of 3 months or longer

NDrain and clean the fuel tank in a

well ventilated area.

NDispose of fuel properly in

accordance with local

environmental requirements.

NRun the engine until the carburetor

is dry – this helps prevent the

carburetor diaphragms sticking

together.

NThoroughly clean the machine – pay

special attention to the air filter.

NRemove, clean and check the

attachment. Coat metal parts with

corrosion inhibiting oil.

NStore the machine in a dry and

secure location Keep out of the

reach of children and other

unauthorized persons.

Storing the Machine

KM 91 R

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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.

before starting work

after finishing work or daily

after each refueling stop

weekly

monthly

every 12 months

if problem

if damaged

as required

Complete machine

Visual inspection (condition, leaks) XX

Clean XX

Replace any damaged parts X

Control handle Check operation XX

Air filter Visual inspection XX

Replace1) X

Manual fuel pump (if fitted) Check X

Have repaired by servicing dealer2) X

Pickup body in fuel tank Have checked by servicing dealer2) X

Have replaced by servicing dealer2) XXX

Fuel tank Clean XX

Carburetor

Check idle adjustment – the working/cut-

ting attachment must not run XX

Adjust idle speed X

Spark plug Adjust electrode gap X

Replace after every 100 operating hours

Cooling inlet Visual inspection X

Clean X

Cylinder fins Have cleaned by servicing dealer2) X

Valve clearance

If power is low or cranking effort very

high, have valve clearance checked

and, if necessary, adjusted by servicing

dealer2)

Spark arresting screen in muffler Check XX

Clean or replace XX

KM 91 R

English

All accessible screws and nuts (not adjust-

ing screws) Retighten X

Anti-vibration elements Check XXX

Have replaced by servicing dealer2) X

Safety labels Replace X

1) Only if there is a noticeable loss of engine power

2) STIHL recommends an authorized STIHL servicing dealer.

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.

before starting work

after finishing work or daily

after each refueling stop

weekly

monthly

every 12 months

if problem

if damaged

as required

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