125 LC2 ‘98

BEDIENUNGSANLEITUNG
OWNER’S HANDBOOK ART. NR. 320531
MANUEL D’UTILISATION 2/98
 IMPORTANT
WE STRONGLY SUGGEST THAT YOU READ THIS HANDBOOK
CAREFULLY AND COMPLETELY BEFORE YOU TAKE YOUR
FIRST RIDE. IT CONTAINS INFORMATION AND TIPS THAT
WILL ENABLE YOU TO OPERATE AND HANDLE YOUR
MOTORCYCLE PROPERLY.

ENGLISH
PAY ATTENTION ESPECIALLY TO THE FOLLOWING INSTRUCTIONS:
 WARNING 
IGNORING THESE INSTRUCTIONS CAN ENDANGER YOUR BODY
AND YOUR LIFE.

! CAUTION !
IGNORING THESE INSTRUCTIONS COULD CAUSE DAMAGE TO
PARTS OF YOUR MOTORCYCLE OR THAT THE MOTORCYCLE
IS NOT ROAD-SAFE ANYMORE. 1

Please insert the series numbers of your motorcycle in the boxes below

Frame number

Engine number

Stamp of dealer
 Introduction
We would like to congratulate you on your purchase of a KTM motorcycle.

You are now owner of a sporty and modern motorcycle which you are bound to
have a great time with, provided you care for it properly. This manual will furnish
you with important information on how to operate and maintain your new KTM
motorcycle. At the time of printing, the handbook covered the most up-to-date
models in this series. It is, however, possible that we may have made slight modi-
fications in the meantime due to development in our motorcycle design.
ENGLISH

Many motorcyclists have a good working knowledge of motorcycle mechanics; if

this is true in your case, you will be able to use this manual to carry out most of
the maintenance steps yourself. If, on the other hand, you are not very familiar
with motorcycles, it might be better to have a professional KTM dealer perform
those steps marked * described in the chapter entitled “Maintenance Work on
Chassis and Engine” of this manual.

2 Take special care to follow the recommended run in, inspection, and maintenance
intervals. Heeding these guidelines will significantly increase the life of your
motorcycle. Have services carried out by a KTM dealer so that your warranty
claim remains intact.

We wish you a lot of fun when driving !

KTM Austria’s certificate of achievement for its Quality System ISO 9001 is the
beginning of an on-going total re-engineering quality plan for a brighter tomorrow.

KTM SPORTMOTORCYCLE AG
5230 MATTIGHOFEN, AUSTRIA

ALL RIGHTS RESERVED TO MAKE ALTERATIONS TO DESIGN AND MODEL.

 INDEX

Page
LOCATING THE SERIAL NUMBERS ......................................4 Checking the rear brake fluid level .................................17
Frame number..................................................................4 Refilling the rear brake reservoir .....................................17
Engine number, engine type.............................................4 Checking the rear brake pads .........................................17
Dismounting and mounting the front wheel...................18

ENGLISH
OPERATION INSTRUMENTS ...............................................4 Dismounting and mounting the rear wheel ....................18
Clutch lever......................................................................4 Tires, air pressure ...........................................................19
Choke lever......................................................................4 Checking spoke tension..................................................19
Hand brake lever..............................................................5 Main fuse.......................................................................19
Speedometer....................................................................5 Replacing the head light bulb .........................................20
Indicator lamps.................................................................5 Replacing the parking-light bulb.....................................20
Ignition lock .....................................................................5 Battery ...........................................................................20
Combination switch .........................................................6 Charging the battery ......................................................21
Starter tip switch, emergency OFF switch.........................6 Cooling system...............................................................21 3
Filler cap...........................................................................6 Checking the cooling liquid level ....................................22
Fuel..................................................................................7 Adjusting the clutch cable ..............................................22
Fuel tap............................................................................7 Adjusting the choke cable ..............................................22
Oil tank............................................................................7 Adjusting the throttle cable ............................................22
Shift lever.........................................................................8 Adjusting the idle speed .................................................22
Foot brake pedal ..............................................................8 Checking the gear oil level .............................................23
Steering lock ....................................................................8 Changing gear oil...........................................................23
Baggage carrier ................................................................8 Bleeding the oil pump ....................................................23

DRIVING INSTRUCTIONS ....................................................9 TROUBLE SHOOTING........................................................24

PERIODIC MAINTENANCE-SCHEDULE ..............................12 CLEANING..........................................................................26

MAINTENANCE WORK ON CHASSIS AND ENGINE ..........13 CONSERVATION FOR WINTER OPERATION ....................26
Tool kit...........................................................................13
Dismounting and mounting of seat ................................13 STORAGE ...........................................................................26
Check and adjust steering head bearing .........................14 Re-initation after time of storage....................................26
Changing the spring preload of the shock absorber........14
Checking chain tension ..................................................14 TECHNICAL SPECIFICATIONS - CHASSIS...........................27
Readjusting chain tension...............................................15
Chain maintenance ........................................................15 TECHNICAL SPECIFICATIONS - ENGINE ............................28
Chain wear.....................................................................15
General informations about disc brakes ..........................15 WIRING DIAGRAM ..................................................appendix
Hand brake lever, setting of pressure point ....................16
Checking of brake fluid level - front brake......................16
Refilling the front brake reservoir ...................................16
Checking the front brake pads .......................................16
Changing the basic position of the brake pedal ..............17
 LOCATING THE SERIAL NUMBERS
Frame number
The frame number is stamped on the right side of the steering head tube.
Write the number into the box on page 1.

Engine number, engine type

ENGLISH

Engine number and engine type are stamped into the engine housing
underneath the carburetor. Write this number into the box on page 1.

OPERATION INSTRUMENTS
1
Clutch lever
The clutch lever 1 is fitted on the left hand side of the handle bar. When
10 mm engine is cold, there should be a play of 10 mm (0.4 in) (measured at outer
edge).
! CAUTION !
IFTHERE IS NO PLAY ON THE CLUTCH LEVER, THE CLUTCH WILL START TO SLIP. THE
CLUTCH WILL THEN OVERHEAT, DESTROYING THE CLUTCH LININGS.

Choke lever
2 When the choke lever 2 is pulled backwards, a bore is opened in the car-
buretor.which enables the engine to draw in additional fuel. This produces
a „rich“ fuel/air mixture necessary for cold start. When the choke lever is
pushed forward as far as it will go, the bore will be closed again. In this
position the choke cable must have a play of approx.2mm.
! CAUTION !
IFTHERE IS NO PLAY IN THE CHOKE CABLE, THE BORE OF THE COLD STARTER SYSTEM
CANNOT BE COMPLETELY CLOSED. THIS RESULTS IN HIGH FUEL CONSUMPTION, THE
ENGINE RUNS UNEVENLY WITH EXTREME WEAR OF PISTON AND CYLINDER.
 Hand brake lever
The hand brake lever is mounted on the right side of the handlebar.
 WARNING 
IF THE RESISTANCE IN THE HAND BRAKE LEVER OR FOOT BRAKE PEDAL FEELS “SPONGY”
(NOT ENOUGH RESISTANCE), THIS IS AN INDICATION THAT SOMETHING IS WRONG WITH
THE BRAKE SYSTEM. DON’T RIDE YOUR MOTORCYCLE ANYMORE WITHOUT FIRST
HAVING THE BRAKE SYSTEM LOOKED OVER BY A KTM DEALER.

Speedometer

ENGLISH
The mileage indicator A in the speedometer 1 indicates overall mileage.
1 The day mileage indicator B can be set to 0 by means of the setting wheel C.
A Turn the setting wheel forward until only zeros can be seen in the display.
NOTE:
Resetting your daily mileage counter to zero when refilling your tank will
make it easier for you to calculate how far you can go on one fill. This will
help you plan your refueling intervals.

B
C 5

Indicator lamps
The green indicator lamp flashes when the flasher light is working in
the same rhythm as the flasher light.

The green indicator lamp lights up when the gear is switched to idle.

The blue indicator lamp lights up when the high beam is on.

The red cooling liquid temperature warning lamp lights up at a coo-

ling liquid temperature of 110° C.
! CAUTION !
PAY ATTENTION TO THE DIRECTIONS IN THE CHAPTER „COOLING SYSTEM“ ON
PAGE 21.

The red oil level warning lamp 2 lights up when the ignition is swit-
ched on, indicating that the oil level warning system works properly.
– If the two-stroke oil level in the oil tank is sufficiently high, the oil level
warning lamp will go out after approximately two seconds.
2 – If the oil level has decreased to approximately 300 ccm, the oil level
warning lamp will stay on, reminding you that the oil tank must be refil-
led with two-stroke oil within the next 100 kilometers.
! CAUTION !
– CHECK FUNCTION OF OIL LEVEL WARNING LAMP BEFORE EVERY RIDE
– ONCE THERE IS NO TWO-STROKE OIL IN THE OIL TANK, THE ENGINE IS BOUND TO
BREAK DOWN.
– OIL PUMP AND OIL LINES MUST BE BLED WHENEVER THE OIL TANK WAS COMPLETELY
EMPTIED (SEE BLEEDING THE OIL PUMP). OTHERWISE THE OIL PUMP WILL NOT DELI-
VER OIL, THUS CAUSING ENGINE DAMAGE.

Ignition lock
Switch positions of ignition lock:
OFF = Ignition off, light off
PARK = Ignition off, light off
ON = Ignition on: engine is at standstill: parking light on, engine may
be started
engine is running: parking light on, head light on
ON = see above
The ignition key can be withdrawn in positions OFF and PARK.
 4

Combination switch
The rocker switch 1 actuates the high beam and low beam.
1 = High-beam light
= Low-beam light
The flasher switch 2 returns to central position after actuation. Press
flasher switch towards switch housing to switch off the flasher.

The horn is sounded with button 3.

ENGLISH

1 The light signal (high beam) is actuated with button 4.

NOTE: The engine must be running in order to be able to check that all
current consumers are functioning correctly.
2

3
6

Starter tip switch, emergency OFF switch

Use the starter tip switch 5 to operate the electric starter.
5
 WARNING 
CHECK BEFORE STARTING IF THE TRANSMISSION IS SET TO NEUTRAL (INDICATOR LAMP
„N“ MUST BE ON).
! CAUTION !
MAXIMUM PERIOD FOR CONTINUOUS STARTING:
5 SECONDS. WAIT AT LEAST 5
6 SECONDS BEFORE TRYING AGAIN.

The emergency OFF switch 6 is mainly a safety and emergency switch and
should normally be ON.
When this symbol is concealed by the switch, the ignition circuit is
short-circuited. The engine is cranked by the electric starter, howe-
ver, it does not start.

When this symbol is concealed by the switch, the ignition circuit is

operative and the engine should start when cranked.

NOTE:
ignition circuit ignition circuit
No locking of the electric starter via the neutral or emergency OFF func-
short-circuited operative tions is provided.
engine does not start engine can be start

Filler cap
To open filler cap: Turn the filler cap counter-clockwise.
To close filler cap: Screw on the filler cap clockwise. Place the tank venting
hose 7 in position, avoiding any kinks.
7
 Fuel
This motorcycle is equipped with separate lubrication. This means that the
two-stroke oil required for engine lubrication is not admixed to the fuel but
contained in a separate oil tank (see below). An oil pump is used for con-
trolled admixing of two-stroke oil into the fuel in the carburetor.
Besides, the motorcycle is equipped with a catalytic converter. Therefore, it
is absolutely necessary to fill in unleaded fuel.

Fuel:
UNLEADED REGULAR GASOLINE WITH AT LEAST 91 OCTANES (RON)

Fuel expands when its temperature rises. Therefore do not fill the tank to
the top (see fig.).
Fuel tank capacity 8.5 liter

 WARNING 

ENGLISH
GASOLINE IS HIGHLY FLAMMABLE AND POISONOUS. EXTREME CAUTION SHOULD BE
USED WHEN HANDLING GASOLINE. DO NOT REFUEL THE MOTORCYCLE NEAR OPEN FLA-
MES OR BURNING CIGARETTES. ALWAYS SWITCH OFF THE ENGINE BEFORE REFUELLING.
35 mm BE CAREFUL NOT TO SPILL GASOLINE ON THE ENGINE OR EXHAUST PIPE WHILE THE
ENGINE IS HOT. WIPE UP SPILLS PROMPTLY. IF GASOLINE IS SWALLOWED OR SPLASHED
IN THE EYES, SEEK A DOCTOR’S ADVICE IMMEDIATELY.

! CAUTION !
NEVER FILL IN LEADED FUEL. LEADED FUEL WILL DESTROY THE CATALYTIC CONVERTER.

Fuel tap
OFF In this position the fuel tap is closed. No fuel may flow to the carbu-
retor.
ON When using the motorcycle, the twist grip must be set to the ON
position. Now fuel may flow to carburetor. In this position the tank
empties down to the fuel reserve of approx. 3 liters.
RES The reserve tank, approximately 3 liters, cannot be tapped until the
twist grip is turned to the RES position. Fill the tank as soon as possi-
ble and remember to turn the twist grip back to the ON position so
that you will have backup fuel next time, too.
! CAUTION !
THE FUEL TAP SHOULD BE LOCKED WHENEVER THE MOTORCYCLE IS PARKED. IF THE TAP
IS NOT CLOSED THE CARBURETOR MAY OVERFLOW AND FUEL GET INTO THE ENGINE.

NOTE:
That the fuel tank can completely be emptied this motorcycle has two fuel
taps.
Open both fuel taps before each start.
OFF ON RES Close both fuel taps after each riding.

RES RES RES

Oil tank
FUEL

FUEL

FUEL
O FF

O FF

O FF

NO NO NO
The oil tank 1 is mounted on the right side in front of the fuel tank. Here,
the two-stroke oil for separate lubrication of the engine must be filled in.
The oil level can easily be checked through the transparent material of the
oil tank.
Engine oil:
2-stroke engine oil suitable for a mixing ratio of 1:50
and for separate lubrication
KTM recommends SHELL ADVANCE VSX2
To open it: pull vent hose out of the frame and turn closure cap counter-
clockwise.
To close it: apply closure cap and turn it clockwise. Stick vent hose into
1 frame and install it without kinks.
Tank volume: 1.3 liters
! CAUTION !
– ONCE THERE IS NO TWO-STROKE OIL IN THE OIL TANK, THE ENGINE IS BOUND TO
BREAK DOWN.
– THE VENT HOSE MUST ALWAYS BE INSTALLED WITHOUT KINKS.
– OIL PUMP AND OIL LINES MUST BE BLED WHENEVER THE OIL TANK WAS COMPLETELY
EMPTIED (SEE BLEEDING THE OIL PUMP). OTHERWISE THE OIL PUMP WILL NOT DELI-
VER OIL, THUS CAUSING ENGINE DAMAGE.
 Shift lever
The shift lever is mounted on the left side of the engine. The position of
the gears is shown in the illustration. Neutral, or the idle speed, is located
between first and second gear.
2,3,4,5,6

Foot brake pedal

ENGLISH

The foot brake pedal is located in front of the right footrest. The basic posi-
tion can be adjusted to the seat position (see maintenance work).
 WARNING 
IF THE RESISTANCE IN THE HAND BRAKE LEVER OR FOOT BRAKE PEDAL FEELS “SPONGY”
(NOT ENOUGH RESISTANCE), THIS IS AN INDICATION THAT SOMETHING IS WRONG WITH
THE BRAKE SYSTEM. DON’T RIDE YOUR MOTORCYCLE ANYMORE WITHOUT FIRST
HAVING THE BRAKE SYSTEM LOOKED OVER BY A KTM DEALER.

Steering lock
The handlebar can be locked by means of the lock located on the steering
head. Fully turn handlebar to right to lock, insert key, turn to left, press in,
turn to right and withdraw.
! CAUTION !
NEVER LEAVE THE KEY INSERTED IN THE STEERING LOCK. IF YOU TURN THE HANDLE BAR
TO THE LEFT THE KEY COULD GET DAMAGED.

Baggage carrier
The baggage carrier may be loaded with up to 10 kg. The two lateral
brackets serve as handles for the passenger
 DRIVING INSTRUCTIONS

Check the following before each start – Read the entire manual carefully before your first drive.
When you start off, the motorcycle must be in a perfect tech- – Familiarize yourself with the operating elements.
nical condition. For safety reasons, you should make a habit of – Adjust the foot brake pedal to the most comfortable positi-
performing an overall check of your motorcycle before each ons for you.
start. – Get used to handling the motorcycle on an empty car park,
before starting on a longer drive. Also try to drive as slowly
The following checks should be performed: as possible and in standing position, to improve your feeling
1 OIL LEVEL IN OIL TANK for the vehicle.
Once there is no two-stroke oil in the oil tank, the engine is – Hold the handlebar with both hands and leave your feet on
bound to break down. The vent hose of the oil tank must the foot rests while driving.
be installed without kinks. – Remove your foot from the foot brake pedal when you are

ENGLISH
2 GEAR OIL LEVEL not braking. If the foot brake pedal is not released the brake
Insufficient amounts of oil in the transmission will lead to pads rub continuously and the braking system is overheated.
premature wear and subsequently to transmission failure. – You may only be accompanied by a passenger if your
3 FUEL motorcycle is fitted and registered for such purposes. The
Check that there is sufficient fuel in the tank. passenger must hold tight to the brackets or hold on to the
4 CHAIN driver during the drive, with his feet on the passenger foot
A loose chain can fall off; an extremely worn chain can tear, rests.
and insufficient lubrication can result in unnecessary wear to – Do not make any alterations to the motorcycle and always
the chain and rear sprockets. use ORIGINAL KTM SPARE PARTS. Spare parts from other
5 TIRES manufacturers can impair the safety of the motorcycle.
Check for damaged tires. Tires showing cuts or dents must – Motorcycles are sensitive to alterations in the distribution of
be replaced. The tread depth must comply with the legal weight. If you are taking luggage with you, this should be
regulations. Also check the air pressure. Insufficient tread secured as close as possible to the middle of the vehicle; dis-
9
and incorrect air pressure reduce the driving performance. tribute the weight evenly between the front and rear wheel.
6 BRAKES Never exceed the maximum permissible laden weight and
Check correct functioning of the braking system. Check for the axle weights. The maximum permissible laden weight is
sufficient brake fluid in the reservoir. If the level of brake made up of the following components:
fluid falls below the minimum value, this indicates a leak in – Motorcycle ready for operation and tank full
the braking system or completely worn out brake pads. – Luggage
Arrange for the braking system to be checked by a KTM – Driver and passenger with protective clothing and helmet.
specialist garage, as complete failure of the braking system – Pay attention to running in instructions.
can be expected.
Also check the state of the brake hoses and the thickness of
the brake linings. Brake linings measured at their thinnest
point should not be less than 1 mm since extremely worn
linings can lead to brake failure.
7 CABLES
Check correct setting and easy running of all control cables. Running in
8 COOLING LIQUID Even finely machined surfaces of engine parts have rougher
Check the level of cooling liquid when the engine is cold. surfaces than parts that slide on each other for a long time.
9 ELECTRICAL SYSTEM Therefore, every engine must be run in. For this reason, do not
Check correct functioning and adjustment of headlights, demand maximum performance from the engine for the first
parking light, tail-lights, brake lights, flashers, indicator 1000 kilometers. The vehicle must be run in at low, changing
lamps, horn and emergency OFF switch while the engine is performance level for the first 1000 KM (620 miles). Maximum
running. rotational speeds during the first 1000 kilometers will have a
10 LUGGAGE negative impact on the engine’s life.
If you are taking luggage with you, check that this is secu-
rely fastened.
 WARNING 
– WEAR SUITABLE CLOTHING WHEN DRIVING A MOTORCYCLE. CLEVER
KTM DRIVERS ALWAYS WEAR A HELMET, BOOTS, GLOVES AND A
JACKET, REGARDLESS OF WHETHER DRIVING ALL DAY OR JUST FOR A
SHORT TRIP. THE PROTECTIVE CLOTHING SHOULD BE BRIGHTLY
COLOURED SO THAT OTHER USERS OF THE ROADS CAN SEE YOU AS
EARLY AS POSSIBLE. YOUR PASSENGER OF COURSE WILL ALSO NEED
SUITABLE PROTECTIVE CLOTHING.
– DO NOT DRIVE AFTER HAVING CONSUMED ALCOHOL.
– ONLY USE ACCESSORIES THAT HAVE BEEN RELEASED BY KTM. FOR
EXAMPLE, FRONT PANELLING CAN IMPAIR THE DRIVING PROPERTIES OF
THE MOTORCYCLE. CASES, EXTRA TANKS ETC. CAN ALTER THE WEIGHT
DISTRIBUTION AND THUS ALSO IMPAIR THE VEHICLE’S DRIVING PRO-
PERTIES.
– THE FRONT AND REAR WHEEL ARE ONLY ALLOWED TO BE TIRED WITH
TIRES THAT HAVE THE SAME PROFILE TYPE.
 Starting when the engine is cold
a) Open the fuel tap
b) Turn on the ignition (ignition key position: ON).
c) Switch the gear to NEUTRAL (green lamp „N“ 1 on).
d) Switch on the emergency OFF switch (symbol 2 must be visible).
e) Operate the choke lever 3.
f) Swing up the stand.
g) Operate the starter tip switch 5 without accelerating.
h) If the engine starts, push the choke lever back a little bit, as soon as the
engine runs unevenly.
 WARNING 
DO NOT START THE ENGINE AND ALLOW IT TO IDLE IN A CLOSED AREA. EXHAUST
FUMES ARE POISONOUS AND CAN CAUSE LOSS OF CONSCIOUSNESS AND DEATH.
ALWAYS PROVIDE ADEQUATE VENTILATION WHILE THE ENGINE IS RUNNING.
! CAUTION !
ENGLISH

– MAXIMUM PERIOD FOR CONTINUOUS STARTING: 5 SECONDS. WAIT AT LEAST 5

1 SECONDS BEFORE TRYING AGAIN.
– DON’T RIDE YOUR MOTORCYCLE WITH FULL LOAD AND DON’T REV ENGINE WHEN
COLD. BECAUSE THE PISTON IS WARMING UP FASTER THAN THE WATER COOLED
CYLINDER, IT CAN CAUSE ENGINE DAMAGE. ALWAYS KEEP IN MIND THAT THE ENGINE
SHOULD BE WARMED UP WITH SMALL LOAD AT MEDIUM R.P.M.

IF THE ENGINE IS DOES NOT CRANK WHEN YOU ACTUATE THE STAR-
TER TIP SWITCH:
– Check if the ignition is on
– Check if the parking light and the cockpit lights are on.
– If this is not the case, the battery is discharged
10 – If the lights are on, proceed as described in the „Trouble-shooting“
section or contact a KTM dealer.

IF THE ENGINE CRANKS BUT DOES NOT START, WHEN YOU ACTUATE
THE STARTER TIP SWITCH:
– Check if the fuel tap is open
– Check if the emergency OFF switch is on
2 – Check if the choke lever has been operated
5 – Check if sufficient fuel is in the tank
– If this is not the case, refill the tank
– if sufficient fuel is in the tank, proceed as described in the „Trouble-
shooting“ section or contact a KTM dealer.

NOTE:
– When you turn on the ignition, you will hear a brief whirring sound.
While you hear this sound, a cleaning cycle of the control roller in the
cylinder is executed.
– Check if the oil level warning lamp works properly (see „Control
lamps“).
3

Starting when the engine is warm

a) Open the fuel tap
b) Turn on the ignition (ignition key position: ON).
c) Switch the gear to NEUTRAL (green lamp „N“ 1 on).
d) Switch on the emergency OFF switch (symbol 2 must be visible).
e) Swing up the stand.
f) Turn up the throttle a bit, and actuate starter tip switch 5.

What to do when the engine is „flooded”

The throttle must be fully opened when starting.

Starting off
Pull the clutch lever. Put the engine into first gear, slowly release the clutch
lever and open throttle at the same time.
 WARNING 
4 BEFORE YOU START OFF, CHECK THAT THE STAND 4 HAS BEEN SWUNG RIGHT UP TO THE
TOP. IF THE STAND DRAGS ON THE GROUND, THE MOTORCYCLE CAN GO OUT OF CONTROL.
Shifting/Riding  WARNING 
You are now in first gear, refered to as the drive or uphill gear. IF THE RADIATOR CAP IS REMOVED WHEN THE ENGINE IS HOT, HOT COO-
Depending on the conditions (traffic, road gradient, etc.), you LING LIQUID, THAT IS UNDER PRESSURE, CAN SPRAY OUT AND CAUSE
can shift to a higher gear. Close throttle, at the same time pull SEVERE BURNS. ALLOW YOUR ENGINE TO COOL DOWN AND, IN THE
clutch lever and shift to the next higher gear. Let clutch lever MEANTIME, CHECK THE COOLING SYSTEM FOR LEAKS.
go again and open throttle. If you turned on the choke, make
sure you turn it off again as soon as engine is warm.
When you reach full speed through turning the throttle grip all
the way, turn throttle back to 3/4; the speed hardly decreases Braking
although the engine will use less gas. Never open the throttle
wider than the engine can handle. Excessive turning of the Close throttle and apply the hand and foot brakes at the same
throttle grip will increase full consumption. time. When driving on sandy, wet or slippery ground use
By shifting down, use the brakes if necessary and close throttle mainly the rear wheel brake. Always brake with feeling,
at the same time. Pull clutch lever and shift down to the next blocking wheels can cause you to skid or fall. Also change
gear. Let clutch lever go slowely and open throttle or shift down to lower gears depending on your speed.
down again.  WARNING 

ENGLISH
If the engine is killed f.ex. at a crossing, simply pull the clutch lever WHEN YOU BRAKE, THE BRAKE DISCS, BRAKE PADS, BRAKE CALIPER AND
and start. It is not necessary to switch the gear to NEUTRAL. BRAKE FLUID HEAT UP. THE HOTTER THESE PARTS GET, THE WEAKER THE
 WARNING  BRAKING EFFECT. IN EXTREME CASES, THE ENTIRE BRAKING SYSTEM CAN FAIL.

– OBSERVE THE TRAFFIC REGULATIONS, DRIVE DEFENSIVELY AND TRYING

TO LOOK AHEAD AS FAR AS POSSIBLE SO THAT ANY HAZARDS CAN BE
RECOGNIZED AS EARLY AS POSSIBLE.
– ADJUST YOUR DRIVING SPEED ACCORDING TO THE CONDITIONS AND Stopping and parking
YOUR DRIVING SKILLS. Apply the brakes fully and put the engine into neutral. To stop
– DRIVE CAREFULLY ON UNKNOWN ROADS the engine, switch off the ignition. Close fuel taps. Park on
– REPLACE THE HELMET VISOR RESPECTIVELY GOGGLE GLASSES IN PLENTY solid ground and lock the vehicle.
OF TIME. WHEN LIGHT SHINES DIRECTLY ON SCRATCHED VISOR OR
GOGGLES, YOU WILL BE PRACTICALLY BLIND.
 WARNING 
– AFTER FALLING WITH THE MOTORCYCLE, CHECK ALL FUNCTIONS – NEVER LEAVE YOUR MOTORCYCLE WITHOUT SUPERVISION AS LONG AS 11
THOROUGHLY BEFORE STARTING UP OPERATIONS AGAIN. THE ENGINE IS RUNNING.
– MOTORCYCLE ENGINES PRODUCE A GREAT AMOUNT OF HEAT WHILE
! CAUTION ! RUNNING. THE ENGINE, THE RADIATORS, EXHAUST SYSTEM, MUFFLER,
– HIGH RPM RATES WHEN THE ENGINE IS COLD HAVE AN ADVERSE BRAKE DISCS, AND SHOCK ABSORBERS CAN BECOME VERY HOT. DO
EFFECT ON THE LIFE OF YOUR ENGINE. WE RECOMMEND YOU RUN NOT TOUCH ANY OF THESE PARTS AFTER OPERATING THE MOTORCY-
THE ENGINE IN A MODERATE RPM RANGE FOR A FEW MILES GIVING IT CLE, AND TAKE CARE TO PARK IT WHERE PEDESTRIANS ARE NOT LIKELY
A CHANCE TO WARM UP. AFTER THAT NO FURTHER PRECAUTIONS IN TO TOUCH IT AND GET BURNED.
THIS RESPECT NEED BE TAKEN. – NEVER PARK YOUR MOTORCYCLE IN PLACES WHERE THERE EXIST FIRE
– NEVER HAVE THE THROTTLE WIDE OPEN WHEN CHANGING DOWN TO A HAZARDS DUE TO DRY GRASS OR OTHER EASILY FLAMMABLE MATERIALS.
LOWER GEAR. THE ENGINE WILL OVERSPEED, DAMAGING THE VALVES.
IN ADDITION, THE REAR WHEEL BLOCKS SO THAT THE MOTORCYCLE ! CAUTION !
CAN EASILY GET OUT OF CONTROL. – ALWAYS USE THE IGNITION LOCK TO TURN OFF THE ENGINE. IF YOU
– IF DURING EXTENDED DOWNHILL RIDES THE ENGINE IS RUNNING USE THE EMERGENCY OFF SWITCH TO TURN OFF THE ENGINE WITH-
ALONG WITHOUT ANY ACTUATION OF THE THROTTLE, YOU HAVE TO OUT SWITCHING OFF THE IGNITION, THE PARKING LIGHT WILL STAY
TURN UP THE THROTTLE A BIT ONCE IN A WHILE TO MAKE SURE THAT ON, THUS DISCHARGING THE BATTERY SO THAT THE ENGINE CAN’T BE
ENOUGH ENGINE OIL IS FED TO THE ENGINE. STARTED WITH THE ELECTRIC STARTER ANY LONGER.
– IF THE RED OIL LEVEL WARNING LAMP LIGHT UP, IT WILL BE NECESSARY – WHEN PARKING YOUR MOTORCYCLE ALWAYS CLOSE FUEL TAP. WITH
TO REFILL THE OIL TANK WITH TWO-STROKE ENGINE OIL DURING THE THE FUEL TAP OPEN, THE CARBURETOR MIGHT OVERFLOW AND FUEL
NEXT 100 KILOMETERS (SEE PAGE 7). COULD FLOW INTO THE ENGINE.
– OIL PUMP AND OIL LINES MUST BE BLED WHENEVER THE OIL TANK – ALWAYS TAKE OUT THE IGNITION KEY WHEN PARKING YOUR
WAS COMPLETELY EMPTIED (SEE BLEEDING THE OIL PUMP). OTHER- MOTORCYCLE SO THAT IT CANNOT BE USED BY UNAUTHORIZED PERSONS.
WISE THE OIL PUMP WILL NOT DELIVER OIL, THUS CAUSING ENGINE – PARK YOUR MOTORCYCLE, SO THAT IT RESTS STABLY ON THE STAND
DAMAGE. (HARD GROUND, LEVEL SURFACE) AND CAN’T TIP OVER.
– IN THE EVENT THAT, WHILE RIDING ON YOUR MOTORCYCLE, YOU
NOTICE ANY UNUSUAL OPERATION-RELATED NOISE, STOP IMMEDIA-
TELY, TURN THE ENGINE OFF, AND CONTACT AN AUTHORIZED KTM
DEALER.

NOTE TO THE COOLING SYSTEM

If due to slow traffic in cities or waiting at a traffic light, for
example, little or no relative wind is blowing through the radia-
tors, it may happen that the cooling water temperature rises
and the red cooling liquid temperature warning lamp lights up
(appr. 110° C, 238° F). In this case, you should try to drive on
briskly, if possible, for generally the lamp will stop being lit
soon if enough relative wind gets into the radiators. However,
you should check the cooling liquid level later on after the
engine has cooled down again.
! CAUTION !
HOWEVER, IF THE RED COOLING-LIQUID TEMPERATURE WARNING LAMP
LIGHTS UP WHILE YOU ARE DRIVING ALONG BRISKLY, THIS WILL INDICATE
A DEFECT IN THE COOLING SYSTEM. IN THIS CASE, STOP IMMEDIATELY,
SINCE OTHERWISE YOU MAY DAMAGE YOUR ENGINE. LET YOUR ENGINE
COOL DOWN, CHECK THE COOLING SYSTEM FOR LEAKS, AND CHECK THE
COOLANT LEVEL. CAUTION - SCALDING HAZARD! DO NOT DRIVE
ON, UNTIL THERE IS SUFFICIENT LIQUID IN THE COOLING SYSTEM.
 KTM KTM
PERIODIC MAINTENANCE SCHEDULE 125 LC2 rider dealer

2nd service at 4000 km

(12500 miles) or after

LC2, Sting 11.97

1000 km (600 miles)

1st service, after
before each start

after 20000 km
(2500 miles) or
after 4000 km
after washing

(2500 miles)

once a year

2 years
Ceck oil level in oil tank    
Check gear oil level    
Change gear oil  
Check exhaust control function  
ENGLISH

Check spark plug, replace it if necessary, adjust electrode distance  

Check intake manifold for leaks and cracks 
Drain and clean carburetor float chamber   
Check idle setting and emission values when engine is warm   
Check vent hoses of oil tank and transmission for kink-free installation   
Clean air filter and air filter box, check carburetor connection boot   
Check sprockets, chain guides and chain    
Clean and lubricate chain   
12 Check chain tension    
Check cooling liquid level    
Check quality of antifreezer  
Check cooling system for leaks - visual checking    
Change cooling liquid 
Check exhaust system for leakage   
Check silent blocks of exhaust brackets  
Check brake fluid level in reservoirs    
Change brake fluid 
Check brake pad thickness   
Check brake discs  
Check condition and correct installation of brake hoses    
Check freeplay and easy operation of hand brake lever and foot brake pedal    
Check telescopic fork for function and tightness    
Service telescopic fork completely 
Check steering head bearing clearance   
Clean and grease steering head bearings and it sealing elements 
Check shock absorber for function and tightness    
Disassemble the Pro Lever suspension system linking and lubricate 
Servicing swingarm pivots 
Check spoke tension and rim join    
Check wheel bearings for clearance   
Check tire condition and air pressure    
Check cables for damage and smooth operation   
Oil and adjust cables   
Check the electrical system    
Check battery rack and connections  
Check adjustment of head light  
Spray ignition lock, emergency OFF switch and light switch with contact spray   
Oil center stand or side stand and check function    
Check all screws, nuts and hose clamps for tight fit    
Grease or oil all pivot points and sliding components    
 MAINTENANCE WORK ON CHASSIS AND ENGINE

 WARNING 
ALL MAINTENANCE AND ADJUSTEMENT OPERATIONS THAT ARE MARKED WITH A * REQUIRE SPECIALIST KNO-
WLEDGE. FOR YOUR OWN SAFETY, LET THESE TASKS BE CARRIED OUT BY A KTM-DEALER

! CAUTION !
– WHEN CLEANING THE MOTORCYCLE, DO NOT USE A HIGH PRESSURE CLEANING UNIT IF POSSIBLE, OTHERWISE WATER WILL PENETRATE THE BEARINGS,
CARBURETOR, ELECTRIC CONNECTORS ETC.
– LET YOUR MOTORCYCLE COOL DOWN BEFORE BEGINNING ANY MAINTENANCE WORK IN ORDER TO AVOID GETTING BURNED.
– DISPOSE OF OIL, GREASE, FILTERS, FUELS, CLEANING AGENTS ETC. ACCORDING TO YOUR LOCAL REGULATIONS.
– UNDER NO CIRCUMSTANCES MAY USED OIL BE DISPOSED OF IN THE SEWAGE SYSTEM OR IN THE OPEN COUNTRYSIDE. 1 LITER USED OIL CONTAMINATES

ENGLISH
1.000.000 LITERS WATER.

13

Tool kit
The tool kit 1 is located in the tool box under the left side cover.

Dismounting and mounting of seat

Remove left and right screws 2. Lift rear portion of seat, pull it backwards,
and disengage it at the oval head screw 3.

Mounting the seat:

– Hook the seat onto the oval head screw 3.
– Slide it forward to let the retaining plate 4 engage in the seat.
3 – Slide retaining shackles of seat under the side covers and mount screws
4
 Check and adjust steering head bearing*
Check steering head bearing for play periodically. To check this support the
2 motorcycle so that the front wheel is off the ground. Now try to move the
fork forward and backward - no play should be discernable For readjust-
ment, release the 5 clamp screws 1 of the top triple clamp and turn the
top screw 2 with the wrench 3 from the tool set until no play is left at all.
Don’t tighten the steering stem bolt all the way, otherwise the bearings will
be damaged. With a plastic hammer, lightly tap on the top triple clamp to
release tension. Re-tight the five clamp screws to 15 Nm (11 ft.lb).
 WARNING 
IF THE STEERING HEAD BEARING IS NOT ADJUSTED TO BE FREE OF PLAY, THE MOTORCYCLE
1 WILL SHOW AN UNSTEADY DRIVING PERFORMANCE AND CAN GET OUT OF CONTROL.

! CAUTION !
IF YOU DRIVE WITH PLAY IN THE STEERING HEAD BEARING FOR LONGER PERIODS, FIRSTLY
THE BEARINGS AND THEN THE BEARING SEATS IN THE FRAME WILL BE DESTROYED.
ENGLISH

3
The steering head bearings should be regreased after 2 years at the latest.

14

Changing the spring preload of the shock absorber

KTM sets the shock absorber for driver only, weighing approximately 75 kg
4 (165 lb). If you want to take a passenger with you, of if you weigh consi-
derably more or less than 75 kg (165 lb), you should change the spring
preload accordingly. This is easily done.
NOTE:
– Before changing the spring preload note down the basic setting, e.g.
how many coils are visible above the adjusting ring.
5 – One rotation of the adjusting ring 5 changes the spring preload by
approximately 1.5 mm.
Use the hook wrenches included in the vehicle tool kit to loosen the coun-
ter ring 4. Change spring preload as desired by means of the adjusting
ring 5, and retighten counter ring.

Checking chain tension

– To check the chain tension, turn off the motorcycle.
– Press chain upward at the end of the chain sliding component. The
distance between chain and swing arm should be approx. 10 mm. In the
course of this procedure, the upper chain portion A must be tensioned
(see drawing).
– If necessary, readjust chain tension.
 WARNING 
– IF CHAIN TENSION IS TOO GREAT, PARTS WITHIN THE SECONDARY POWER TRANSMIS-
SION (CHAIN, CHAIN SPROCKETS, TRANSMISSION AND REAR WHEEL BEARINGS) WILL BE
SUBJECTED TO UNNECESSARY STRESS, RESULTING IN PREMATURE WEAR AND EVEN CHAIN
BREAKAGE.
– TOO MUCH SLACK IN THE CHAIN, ON THE OTHER HAND, CAN RESULT IN THE CHAIN
JUMPING OFF THE CHAIN WHEELS. IF THIS HAPPENS, THE CHAIN COULD ALSO BLOCK
THE REAR WHEEL OR DAMAGE THE ENGINE.
10 m
m – IN EITHER CASE THE OPERATOR IS LIKELY TO LOSE CONTROL OF THE MOTORCYCLE.
 Readjust chain tension
– Loosen collar nut 1, loosen counter nuts 2, and turn right and left
2 adjusting screws 3 equally far. Tighten counter nuts.
4 – Before tightening the collar nut, verify that the chain tensioners 4 are
sitting close to the adjusting screws and that the rear wheel has been
aligned with the front wheel.
– Tighten collar nut 1 with 80 Nm (60 ft.lb).

3 1

Chain maintenance

ENGLISH
O-ring chains require only modest maintenance. The best way is to use lots
of water, but never use brushes or solvents. After letting the chain dry, you
can use a special O-ring chain spray (Shell Advance Bio Chain).
 WARNING 
NO LUBRICATION IS ALLOWED TO REACH THE REAR TIRE OR THE BRAKE DISKS, EITHER-
WISE THE ROAD ADHERENCE AND THE REAR WHEEL BRAKING EFFECTS WOULD BE STRON-

✓
GLY REDUCED AND THE MOTORCYCLE COULD EASILY GET OUT OF CONTROL.

! CAUTION !
WHEN MOUNTING THE CHAIN JOINT, THE CLOSED SIDE OF THE SAFETY DEVICE MUST
POINT IN RUNNING DIRECTION.
Also check sprockets and chain guides for wear, and replace if necessary. 15

15 KG

Chain wear
In order to check the chain wear, regard the following instructions:
Shift the gear into idling and pull the upper chain strand with approx. 10-
15 kilogramm (33 lb) upwards (see figure). Now one can measure a space
of 18 chain reels at the lower chain strand. The chain should be replaced at
the latest when a space of 272 mm (10,70 in) is measured. Chains do not
always wear off evenly, therefore repeat the measurement at different pla-
ces on the chain.
NOTE:
If you mount a new chain, the sprockets should also be replaced. New
chains wear faster if used on old used sprockets.

max. 272 mm
General informations about KTM disc brakes
BRAKE CALIPERS:
1 2 3 16 17 18 The brake calipers of this series “float“. This means that the brake calipers
are not solidly attached to the caliper support. Thus, the brake pads are
always in optimum contact with the brake disc.

BRAKE FLUID RESERVOIRS:

The brake fluid reservoirs on the front and rear wheel brakes have been
designed in such a way that even if the brake pads are worn it is not neces-
sary to top up the brake fluid. If the brake fluid level drops below the mini-
mum either the brake system has a leak or the brake pads are completely
worn down.
DOT DOT

✕
In this case, consult an authorized KTM dealer immediately.
5.1 5

✓
BRAKE FLUID:
KTM fills the brake systems with „Shell Advance Brake DOT 5.1“ brake
fluid, one of the best brake fluids that is currently available. We recom-
mend that you continue to use it. DOT 5.1 brake fluid is based on glycol
ether and of an amber color. If you do not have any DOT 5.1 for refilling,
you may use DOT 4 brake fluid. However, you should replace it as soon as
possible by DOT 5.1.
 Hand brake lever, setting of pressure point
The pressure point is the point of resistance felt on the hand brake lever
when the brake pads contact the brake disc. The hand brake lever move-
ment from start to pressure point can be adjusted by adjustment screw 1.
This way the play can be adjusted to fit any hand size.
If you turn the adjusting screw clockwise - pressure point moves away
from throttle grip
If you turn it counterclockwise - pressure point moves toward throttle grip

Checking of brake fluid level - front brake

ENGLISH

The brake fluid reservoir is linked with the hand brake cylinder at the hand-
lebar and the reservoir is provided with an inspection glass. With the reser-
voir in a horizontal position, the brake fluid level should not go below
middle of the glass.
 WARNING 
IFTHE BRAKE FLUID LEVEL DROPS BELOW THE MINIMUM EITHER THE BRAKE SYSTEM HAS
A LEAK OR THE BRAKE PADS ARE COMPLETELY WORN DOWN. IN THIS CASE, CONSULT
AN AUTHORIZED KTM DEALER IMMEDIATELY.

16

3 Refilling the front brake reservoir*

2 Loosen screws 2 and remove lid 3 and membrane 4.
Place hand brake cylinder in a horizontal position and fill the brake fluid
reservoir to 5 mm (0.2 in) below the rim with brake fluid DOT 5.1 (Shell
Advance Brake DOT 5.1). Replace membrane and lid, tighten screws. Rinse
off spilled or overflowing brake fluid with water.
 WARNING 
– NEVER USE DOT 5 BRAKE FLUID! IT IS BASED ON SILICONE OIL AND OF A PURPLE
4 COLOR. SEALS AND BRAKE HOSES MUST BE ESPECIALLY ADAPTED TO IT.
– STORE BRAKE FLUID OUT OF REACH OF CHILDREN.
– BRAKE FLUID CAN CAUSE SKIN IRRITATION. AVOID CONTACT WITH SKIN AND EYES. IF
YOU GET BRAKE FLUID IN YOUR EYES, RINSE WITH PLENTY OF WATER AND CONSULT
A DOCTOR.

! CAUTION !
– DON’T LET BRAKE FLUID GET IN CONTACT WITH PAINT, IT IS AN EFFECTIVE PAINT REMOVER.
– USE ONLY CLEAN BRAKE FLUID TAKEN FROM A TIGHTLY SEALED CONTAINER.
5 mm

min. Checking the front brake pads

The brake pads can be inspected from below. The linings must be at least 1 mm
1 mm (0.04 in) thick.
 WARNING 
AT THEIR MOST WORN POINT BRAKE PAD LININGS SHOULD NOT BE THINNER THAN 1
MM, OTHERWISE THEY COULD LEAD TO BRAKE FAILURE. FOR YOUR OWN SAFETY DON’T
PUT OFF HAVING YOUR BRAKE PADS CHANGED.

! CAUTION !
IFTHE BRAKE PADS ARE REPLACED TOO LATE SO THAT THE LINING IS PARTLY OR ENTI-
RELY WORN AWAY, THE STEEL COMPONENTS OF THE BRAKE PAD WILL RUB AGAINST THE
BRAKE DISC, IMPAIRING THE BRAKING EFFECT AND DESTROYING THE BRAKE DISC.
 Changing the basic position of the foot brake pedal*
The basic position of the foot brake pedal can be altered by turning the
stop screw 1. The free play at the foot brake pedal must then be adjusted
by means of the push rod 2.
Measured on the outside, the foot brake pedal must have 3-5 mm
2 (0.12–0.20 in) of free play, before the push rod can move the piston in the
brake cylinder (to be recognised from the resistance on the foot brake
pedal).
! CAUTION !
IF THIS FREE PLAY IS NOT PRESENT, THEN PRESSURE CAN BUILD UP IN THE BRAKE SYSTEM
WHEN DRIVING, CAUSING CONSTANT FRICTION OF THE BRAKE PADS.THE BRAKING
3-5 mm SYSTEM OVERHEATS AND CAN FAIL COMPLETELY IN EXTREME CASES.
1

Checking rear brake fluid level

ENGLISH
The reservoir for the rear disc brake is located on the left-hand side of the
vehicle next to the carburetor connecting boot. The brake fluid level may not
drop below the „MlN” marking when the vehicle is in an upright position.
 WARNING 
IFTHE BRAKE FLUID LEVEL DROPS BELOW THE MINIMUM EITHER THE BRAKE SYSTEM HAS
A LEAK OR THE BRAKE PADS ARE COMPLETELY WORN DOWN. IN THIS CASE, CONSULT
AN AUTHORIZED KTM DEALER IMMEDIATELY.

17

Refilling the rear brake reservoir*

When the brake fluid level has dropped to the MIN mark, you need to refill
the brake fluid reservoir. This is done by first unscrewing the cap 3 and
rubber boot 4. Add brake fluid DOT 5.1 (Shell Advance Brake DOT 5.1)
until it reaches the MAX mark, then screw rubber boot and cap back on.
Rinse off spilled or overflowing brake fluid with water.
 WARNING 
– NEVER USE DOT 5 BRAKE FLUID! IT IS BASED ON SILICONE OIL AND OF A PURPLE
COLOR. SEALS AND BRAKE HOSES MUST BE ESPECIALLY ADAPTED TO IT.
– STORE BRAKE FLUID OUT OF REACH OF CHILDREN.
– BRAKE FLUID CAN CAUSE SKIN IRRITATION. AVOID CONTACT WITH SKIN AND EYES. IF
YOU GET BRAKE FLUID IN YOUR EYES, RINSE WITH PLENTY OF WATER AND CONSULT
A DOCTOR

! CAUTION !
– DON’T LET BRAKE FLUID GET IN CONTACT WITH PAINT, IT IS AN EFFECTIVE PAINT REMOVER.
– USE ONLY CLEAN BRAKE FLUID TAKEN FROM A TIGHTLY SEALED CONTAINER.

Checking the rear brake pads

min. The brake pads can be inspected from the rear. The thickness of the linings
1 mm may not be less than 1 mm (0.04 in).
 WARNING 
AT THEIR MOST WORN POINT BRAKE PAD LININGS SHOULD NOT BE THINNER THAN 1
MM, OTHERWISE THEY COULD LEAD TO BRAKE FAILURE. FOR YOUR OWN SAFETY DON’T
PUT OFF HAVING YOUR BRAKE PADS CHANGED.

! CAUTION !
IFTHE BRAKE PADS ARE REPLACED TOO LATE SO THAT THE LINING IS PARTLY OR ENTI-
RELY WORN AWAY, THE STEEL COMPONENTS OF THE BRAKE PAD WILL RUB AGAINST THE
BRAKE DISC, IMPARING THE BRAKING EFFECT AND DESTROYING THE BRAKE DISC.
 Dismounting and mounting the front wheel*
– Jack the motorcycle up by the frame so that the front wheel no longer
2 2 touches the ground.
– Loosen the collar screw 1
– Loosen the 4 hexagon nuts 2 on the fork leg axle passage.
– Hold the front wheel, pull out the wheel spindle 3.
– Remove front wheel carefully from the fork and take speedometer drive
4 off the hub.
! CAUTION !
DO NOT OPERATE THE HAND BRAKE UNLESS THE FRONT WHEEL HAS BEEN MOUNTED.

1 3 4

– Prior to mounting the front wheel, clean and grease shaft seal ring 5
5
ENGLISH

and running surface 6 at the speedometer drive.

– To mount the front wheel, lift it into the fork. Insert speedometer drive
into the hub. Make sure that the driving tabs 7 engage with the slots
of the drive.
– Position front wheel and speedometer drive, and mount wheel spindle.

6
18

– Mount collar screw 1, turn speedometer drive in a way that the spee-
dometer cable A will curve upwards in a slight bow (see figure), and
tighten collar screw with 40 Nm (30 ft.lb.).
– Take the motorcycle off the stand operate the front wheel brake and
bounce the fork hard a few times to align the fork tubes.
– Then tighten hexagon nuts 2 with a torque of 5 Nm (4 ft.lbs)
 WARNING 
– IF YOU DON’T HAPPEN TO HAVE A TORQUE WRENCH AT HAND, MAKE SURE YOU
HAVE THE TIGHTENING TORQUE CORRECTED BY A KTM DEALER AS SOON AS POSSI-
BLE. A LOOSE WHEEL SPINDLE MAY LEAD TO AN UNSTABLE DRIVING BEHAVIOR OF
A YOUR MOTORCYCLE.
– AFTER MOUNTING THE FRONT WHEEL, KEEP OPERATING THE HAND BRAKE UNTIL THE
PRESSURE POINT RETURNS.
– IT IS VERY IMPORTANT TO KEEP THE BRAKE DISK FREE FROM OIL AND GREASE,
OTHERWISE THE BRAKING EFFECT WOULD BE STRONGLY REDUCED.

Dismounting and mounting the rear wheel*

9 Jack the motorcycle up by the frame so that the rear wheel no longer tou-
ches the ground. Loosen the collar nut 8, remove chain tensioner 9, hold
8 the rear wheel pull out the wheel spindle bk until the rear wheel is free but
the brake caliper support is still held. Push the rear wheel as far forward as
possible, take the chain from the chain sprocket and carefully take the rear
wheel out of the swing arm.
! CAUTION !
– DO NOT OPERATE THE FOOT BRAKE WHEN THE REAR WHEEL HAS BEEN DISMOUNTED.
– WHEN THE WHEEL SPINDLE IS DISMOUNTED, CLEAN THE THREADS OF THE WHEEL
SPINDLE AND COLLAR NUT THOROUGHLY AND APPLY A NEW COAT OF GREASE TO
PREVENT THE THREAD FROM JAMMING.

The rear wheel is remounted in reverse order. Before tightening the collar
nut with 80 Nm (60 ft.lb), push the rear wheel forwards so that the chain
tensioners lie on the tension screws.
 WARNING 
– IF YOU DON’T HAPPEN TO HAVE A TORQUE WRENCH AT HAND, MAKE SURE YOU
HAVE THE TIGHTENING TORQUE CORRECTED BY A KTM DEALER AS SOON AS POSSI-
BLE. A LOOSE WHEEL SPINDLE MAY LEAD TO AN UNSTABLE DRIVING BEHAVIOR OF
YOUR MOTORCYCLE.
– AFTER MOUNTING THE REAR WHEEL, KEEP OPERATING THE FOOTBRAKE UNTIL THE
PRESSURE POINT RETURNS.
10 – IT IS VERY IMPORTANT TO KEEP THE BRAKE DISK FREE FROM OIL AND GREASE,
OTHERWISE THE BRAKING EFFECT WOULD BE STRONGLY REDUCED.
 Tires, air pressure
Tire type, tire condition, and how much air pressure the tires have in them
affect the way your motorcycle rides, and they must therefore be checked
whenever you’re getting ready to go anywhere on your motorcycle.
– Tire type and size can be found in the technical specifications and in the
homologation certificate
– Tire condition has to be checked every time you want to ride your
motorcycle. Before leaving check for punctures and nails or other sharp
objects that might have become embedded in the tire.
Refer to the specific regulations in your country for minimum tire tread
requirements. We recommend replacing tires at the latest when the
tread is down to 2 mm.
– Tire pressure should be checked regularly on a “cold” tire. Proper pres-
sure ensures optimum driving comfort and extends the life of your tires.
 WARNING 
– DO NOT MOUNT TIRES WHICH HAVE NOT BEEN APPROVED BY KTM. OTHER TIRES

ENGLISH
COULD HAVE ADVERSE EFFECTS ON THE WAY YOUR MOTORCYCLE RIDES.
– THE FRONT AND REAR WHEEL ARE ONLY ALLOWED TO BE TIRED WITH TIRES THAT
HAVE THE SAME PROFILE TYPE.
– FOR YOUR OWN SAFETY REPLACE DAMAGED TIRES IMMEDIATELY.
– WORN TIRES CAN HAVE A NEGATIVE EFFECT ON HOW YOUR MOTORCYCLE PER-
FORMS, ESPECIALLY ON WET SURFACES
– IF AIR PRESSURE IS TOO LOW, ABNORMAL WEAR AND OVERHEATING OF THE TIRE
CAN RESULT

front tyre air pressure rear tyre air pressure

driver only 1.8 bar (26 psi) 2.0 bar (29 psi)
driver plus passenger 2.0 bar (29 psi) 2.2 bar (32 psi)
19

Checking spoke tension

The correct spoke tension is very important for the stability of the wheels
and thus for riding safety. A loose spoke causes the wheel to become
unbalanced and before long other spokes will have come loose. Check
spoke tension, especially on a new motorcycle, in regular intervals. For
checking, tap on each spoke with the blade of a screw driver (see illustra-
tion). A clear tone must be the result. Dull tones indicate loose spokes. If
necessary, have the spokes retightened and the wheel centered by a KTM
dealer.

Main fuse
The main fuse 1, which is located above the carburetor, protects the follo-
wing current consumers:
– Electric starter system
– Parking light
– Flasher lights
1 – Horn
– Oil level warning lamp
– NEUTRAL lamp
Rated fuse current is 10 amperes
! CAUTION !
UNDER NO CIRCUMSTANCES IS A STRONGER FUSE ALLOWED TO BE SET IN OR A FUSE
ALLOWED TO BE “REPAIRED”. AN INEXPERT TREATMENT COULD DAMAGE THE WHOLE
ELECTRICAL INSTALLATION!
 Replacing the head light bulb
2 For this purpose, remove right and left screws 1 and pivot top of headlight
1 mask forward.
For replacing the headlight lamp, pull out connector of the lamp, turn
retaining ring 2 counterclockwise, remove it, and remove old lamp. Install
new lamp such that the bulb pins 3 engage with the socket groove 4.
Mount retaining ring and connector.
Connect bottom of headlight mask at the holding pins, and pivot its top
toward the speedometer. Mount screws 1.

Replacing the parking-light bulb

ENGLISH

Remove the headlight mask as described above and simply pull the bulb
socket 5 out of the reflector.

4
20

Battery
The battery is mounted under the seat (remove the seat, see page 13).
The battery has a closed system and therefore requires no maintenance. It
is not necessary to check the electrolyte level or to refill water. Simply keep
the battery poles clean and slightly grease them with an acid-free grease if
necessary.
When removing the battery turn off all power consumers and then dis-
connect the negative pole first. When reinstalling the battery the negative
pole is connected last.
 WARNING 
– IF ELECTROLYTE (SULPHURIC ACID) LEAKS FROM THE BATTERY, PROCEED WITH GREAT
CARE. THE ELECTROLYTE CAN CAUSE SEVERE BURNS.
– IN THE CASE OF SKIN CONTACT RINSE THOROUGHLY WITH WATER.
– IN THE CASE OF CONTACT WITH THE EYES, THOROUGHLY RINSE EYES WITH WATER
FOR AT LEAST 15 MINUTES. IMMEDIATELY CONSULT A DOCTOR!
– THE BATTERY IS A CLOSED MODEL BUT CAN NEVERTHELESS EMIT EXPLOSIVE GASES.
6 AVOID SPARKS AND OPEN FIRE NEAR THE BATTERY.
– DEFECT BATTERIES MUST BE STORED OUT OF THE REACH OF CHILDREN. ENSURE
PROPER DISPOSAL OF DISCARDED BATTERIES.

! CAUTION !
– DO NOT REMOVE THE SEALING STRIP 6. THE SEALING STRIP WILL BE DAMAGED IF
REMOVED.
– NEVER DISCONNECT THE BATTERY WHILE THE ENGINE IS RUNNING. THIS WILL DEST-
ROY THE RECTIFIER-REGULATOR.

BATTERY STORAGE:
When preparing the motorcycle for a longer period of standstill, remove
the battery and recharge it. Storage temperature: 0 - 35° C. Do not expose
to direct sun radiation.
 Charging the battery
Remove the battery and check the charging level. Use a voltmeter to mea-
sure the voltage between the battery poles (off-load voltage).
Accurate results can only be obtained if the battery has neither been charged
nor discharged during a period of 30 minutes preceding the measuring.
off load voltage charging level charging time charging voltage
VOLT
Volt % 0.3 A
>12.7 100 ––
~12.5 75 4h
max.
~12.2 50 7h
14.4 V
~12.0 25 11 h
~11.8 0 14 h

ENGLISH
If the battery is empty, it can be recharged for a maximum period of 10
hours at 0.3 A and a maximum of 14.4 V.
! CAUTION !
– DO NOT REMOVE THE SEALING STRIP.
– ALWAYS CONNECT THE BATTERY TO THE CHARGING UNIT BEFORE TURNING THE
CHARGING UNIT ON.
– WHEN RECHARGING THE BATTERY IN CLOSED ROOMS ENSURE SUFFICIENT VENTILA-
TION. EXPLOSIVE GASES ARE RELEASED DURING THE BATTERY CHARGING PROCESS.
– CHARGING TIME AND CHARGING VOLTAGE SHOULD NOT EXCEED THE STATED
VALUES. OTHERWISE ELECTROLYTE WILL BE RELEASED THROUGH THE SAFETY VALVES.
– AVOID QUICK CHARGING IF POSSIBLE.
21

Cooling system
The cooling liquid is circulated by the water pump 1 in the engine. When
the engine is cold the cooling liquid circulates only through the cylinder
2 and the cylinder head. After the engine has reached its operating tempera-
ture (approx. 65° C), the thermostat 2 opens and cooling liquid is pumped
also through the aluminum radiator.
Air blowing in through the radiators cools the cooling liquid. The slower the
speed of the motorcycle, the less the cooling liquid is cooled down. Dirty
radiator ribs also reduce the cooling efficiency.
If due to slow traffic in cities or waiting at a traffic light, for example, little
1 or no relative wind is blowing through the radiators, it may happen that
the cooling water temperature rises and the red cooling liquid temperature
warning lamp 3 lights up (appr. 110° C, 238° F). In this case, you should
try to drive on briskly, if possible, for generally the lamp will stop being lit
soon if enough relative wind gets into the radiators. However, you should
check the cooling liquid level later on after the engine has cooled down again.
! CAUTION !
HOWEVER, IF THE RED COOLING-LIQUID TEMPERATURE WARNING LAMP LIGHTS UP
WHILE YOU ARE DRIVING ALONG BRISKLY, THIS WILL INDICATE A DEFECT IN THE COO-
LING SYSTEM. IN THIS CASE, STOP IMMEDIATELY, SINCE OTHERWISE YOU MAY DAMAGE
YOUR ENGINE. LET YOUR ENGINE COOL DOWN, CHECK THE COOLING SYSTEM FOR
LEAKS, AND CHECK THE COOLING LIQUID LEVEL. CAUTION - SCALDING HAZARD!
3 DO NOT DRIVE ON, UNTIL THERE IS SUFFICIENT LIQUID IN THE COOLING SYSTEM.
 WARNING 
IFTHE RADIATOR CAP IS REMOVED WHEN THE ENGINE IS HOT, HOT COOLANT, THAT IS
UNDER PRESSURE, CAN SPRAY OUT AND CAUSE SEVERE BURNS. ALLOW YOUR ENGINE TO
COOL DOWN AND, IN THE MEANTIME, CHECK THE COOLING SYSTEM FOR LEAKS.

A mixture of 40% antifreezer liquid and 60% water is used as cooling

liquid. How-ever, the anti-freeze protection must be at least -25° C (-13° F).
Aside from antifreezing protection, this mixture also provides great corro-
sion protection which is why it must not be replaced by pure water.
4 ! CAUTION !
FOR THE COOLING SYSTEM, USE ONLY HIGH-GRADE ANTIFREEZER (SHELL ADVANCE
COOLANT). USING LOWERGRADE ANTIFREEZE AGENTS, CAN CAUSE CORROSION AND
COOLANT FOAMING.

Pressure induced by heating of the cooling liquid in the cooling system is

controlled by a valve in the radiator cap 4; a water temperature rising up
to 120° C (248° F) is admissible, without fear of problems.
 Checking the cooling liquid level
The cooling liquid should be 10 mm (0,4 in) above the cooling elements
when the engine is cold (cf. diagram). In the event of the cooling liquid
being drained, always fill the system before hand, then top off while the
10 mm engine is running.
 WARNING 
IFPOSSIBLE, ALWAYS CHECK LEVEL OF COOLING LIQUID WHEN ENGINE IS COLD. IF YOU
when engine is cold HAVE TO OPEN THE RADIATOR CAP WHEN ENGINE IS HOT, USE A RAG TO COVER THE
CAP AND OPEN SLOWLY TO RELEASE PRESSURE.

Adjusting the clutch cable

ENGLISH

When the engine is cold, the play at the clutch lever should be 10 mm (0.4
1 in) (measured at the outer edge).
To adjust the clutch cable turn the adjusting nut 1 accordingly.

ca. 10 mm

22

Adjusting the choke cable*

At the choke cable, there must always exist a play of approx. 2 mm (0.1 in).
To check this, push choke lever fully forward and pull protective cover 2
from the adjuster piece 3. Now, it must be possible to lift the outer cover-
ing of the cable by approx. 2 mm (0.1 in) from the adjuster piece until fee-
2 mm ling a resistance. If necessary, loosen counter nut and readjust play by tur-
ning the adjuster piece. Tighten counter nut, and slide on protective cover.

2
3

Adjusting the throttle cable*

3-5 mm There must always be a 3-5 mm (0.1-0.2 in) play in the throttle cable. To
check this, move back the protective cover 4 on the throttle grip. You
must be able to lift the outer covering of the cable 3-5 mm from the adju-
sting screw 5, until resistance is felt.
To adjust, loosen the counter nut 6 and turn the adjusting screw accor-
dingly. Finally tighten counter nut and slide the protective cover back on.

6 5
4

Adjusting the idle speed*

The idle speed can be adjusted with idle screw 7.

Turning in clockwise direction will increase the idle speed.

Turning in counter-clockwise direction will reduce the idle speed.

7
 Checking the gear oil level
To make checking the gear oil level easy, an inspection glass 1 is disposed
at the right side of the engine.
– Warm up engine, then turn it off and wait for 2 minutes so that the oil
may flow back into the transmission case.
– Hold motorcycle in a straight position on a horizontal surface (do not
put it on the side stand), and read the oil level.
1 – The oil level should be in the upper half of the inspection glass.
NOTICE: placing the motorcycle in another than a fully upright position
will falsify the measuring result.
– If necessary, fill in 10W30 engine oil (Shell Advance Ultra).
! CAUTION !
TOO LITTLE OIL OR A POOR OIL QUALITY WILL CAUSE PREMATURE WEAR OF TRANSMIS-
SION AND CLUTCH. ONLY USE BRANDED OIL (SHELL ADVANCE ULTRA).

ENGLISH
2 Changing gear oil*
– Warm up engine.
– Remove screw 2, and drain old oil into an appropriate container.
– Tilt your motorcycle to the right to ensure that the entire oil is discharged. 23
– Mount screw with gasket, and tighten it with 15 Nm.
– Unscrew closure cap 3, and fill in 0.75 liters of 10W30 engine oil (Shell
Advance Ultra).
3 – Mount closure cap and check engine for possible oil loss.
! CAUTION !
TOO LITTLE OIL OR A POOR OIL QUALITY WILL CAUSE PREMATURE WEAR OF TRANSMIS-
SION AND CLUTCH. ONLY USE BRANDED OIL (SHELL ADVANCE ULTRA).

Bleeding the oil pump

OIL PUMP AND OIL LINES MUST BE BLED WHENEVER THE OIL TANK
WAS COMPLETELY EMPTIED (SEE BLEEDING THE OIL PUMP). OTHER-
WISE THE OIL PUMP WILL NOT DELIVER OIL, THUS CAUSING ENGINE
4 DAMAGE.

– Remove cover of oil pump.

– Remove bleeder screw 4. Do not close bleeder screw until oil without
air bubbles is discharged.
– Disconnect oil line from oil pump to carburetor and fill it with oil.
– Reconnect oil line.
– Start the engine and set oil pump to maximum capacity by pulling the
cable 5 out. Let engine run at 2000 r.p.m. for approx. 2-3 minutes.
This is the only way how to fully bleed the lubricating system.
– Stop the engine and mount oil-pump cover together with new gasket.
! CAUTION !
NEVER REV UP THE ENGINE DURING BLEEDING, BECAUSE THE OIL PUMP DOES NOT YET
5 SUPPLY ENOUGH OIL TO ALL LUBRICATING POINTS.
 TROUBLE SHOOTING

If you let the specified maintenance work on your motorcycle be carried out, disturbances can hardly be expected. Should an error
occur nevertheless, we advise you to use the trouble shooting chart in order to find the cause of error.
We would like to point out that many operations cannot be performed by the rider himself. In case of uncertainty, please contact a
KTM-dealer.

TROUBLE CAUSE REMEDY

Engine does not crank operating error switch on ignition

blown main fuse replace main fuse

discharged battery recharge battery, and determine cause of discharge, consult

ENGLISH

an authorized KTM dealer

defective ignition lock or emer- check ignition lock and emergency OFF switch
gency OFF switch consult an authorized KTM dealer

Engine cranks but fails to emergency OFF switch is set to position emergency OFF switch such that is visible.
start wrong position. is visible.

defective emergency OFF switch disconnect 4-pole connector of emergency OFF switch
(underneath the headlamp mask). Shift to 2nd gear and push
your motorcycle. If the engine starts now, the emergency
OFF switch needs to be replaced.
24
empty fuel tank refuel your vehicle

fuel contaminated with water or dismount fuel tank, carburetor, and fuel lines. Rinse out fuel
dirt tank with pure fuel. Clean carburetor with pure fuel and
compressed air.

float is not tight or defective replace float

air filter is extremely dirty clean or replace air filter

interrupted fuel supply check function of tank ventilation, clean fuel tap

flooded engine for procedure see driving instructions

sooty or wet spark plug clean or replace spark plug

electrode gap too large adjust electrode gap to 0.7 mm

worn electrodes replace spark plug

defective spark plug remove spark plug, connect ignition cable, hold spark plug to
ground (bare spot on engine) and actuate starter, a strong
spark must be producted at the spark plug. If this is not the
case, the ignition system must be checked

defective spark plug connector disconnect spark plug connector from ignition cable, hold it
about 5mm away from ground and actuate starter. If there is
no spark, have ignition system checked.

oxidized connectors of CDI unit, remove seat and fuel tank, clean connectors and treat them
pulse generator, or ignition coil with contact spray

defective pulse generator coil have ignition system checked

water in carburetor, or clogged jets dismount and clean carburetor

carburetor not fitted properly at check carburetor for correct fit

intake flange

Engine fails to idle clogged idling jet disassemble carburetor and clean jets

incorrect adjustment of adjusting have carburetor adjusted

screws on carburetor

defective ignition system have ignition system checked

TROUBLE CAUSE REMEDY

Engine fails to rev high fuel level in carburetor is too high disassemble and clean carburetor, and check it for wear
– leaking float needle valve replace float needle valve
– float is not tight replace float
– float has no axial play resurface float

loose carburetor jets tighten jets

electronic ignition timing is faulty have ignition system checked

Engine has too little power fuel supply partially interrupted or clean and check fuel system and carburetor
dirty carburetor

control roller fails to move turn on ignition and check whether the cleaning cycle of the
control roller is executed. If not, check control roller for

ENGLISH
smooth running or check servomotor

incorrect adjustment of control rol- adjust cables

ler cables

fuel level in carburetor is too high disassemble and clean carburetor, and check it for wear

air filters are extremely dirty clean or replace air filter

leaking or deformed exhaust system check exhaust system for damage

electronic ignition timing is faulty have ignition system checked

25
Engine misfires or backfires fuel shortage check and clean fuel system and carburetor
into carburetor
engine takes in unmetered air check intake flange and carburetor for tight fit

Engine overheats not enough cooling liquid in coo- replenish cooling liquid (see maintenance work), check coo-
ling system ling system for leaks

radiator fins are extremely dirty clean radiator fins with water jet

foam forms in cooling system replace cooling liquid, use branded antifreeze agent

bent radiator hose shorten or replace radiator hose

defective thermostat dismantle thermostat and have it checked (opening tempera-

ture: 65° C) or replace it

All activated lamps are defective voltage regulator remove seat and fuel tank, and check connections, check vol-
blown out tage regulator

Battery is discharged ignition (power consumer) not tur- charge battery according to instructions
ned OFF

discharge due to residual current perform electric loss test

no charge check connections and components of the charging system

 CLEANING
Clean the motorcycle at regular intervals to preserve the outward appearance of the plastic parts.
The best manner would be to use warm water that has been mixed with a normal trade washing detergent and a sponge. The hard
dirt can be removed before with the help of a soft water jet.
! CAUTION !
NEVER CLEAN YOUR MOTORCYCLE WITH A HIGH-PRESSURED CLEANER OR A HIGH-PRESSURED WATER JET. THE WATER COULD OTHERWISE RUN INTO THE
ELECTRICAL COMPONENTS, CONNECTORS, SHEATHED CABLES, BEARINGS, CARBURETOR ETC. AND CAUSE DISTURBINGS OR LEAD TO A PREMATURE DESTRUC-
TION OF THESE PARTS.

– You should use normal trade-mark detergents to clean the engine. Strongly dirted parts should be cleaned additionally with the
help of a paint brush.
– After the motorcycle has been rinsed with a soft water jet, it should be dried by air pressure and a cloth. Then take a short drive
until the engine has reached the working temperature and also use the brakes. Due to the heat, the water also evaporates at the
ENGLISH

unapproachable parts of the engine and the brakes.

– Slide back the protective covers on the handlebar-mounted instruments so that any water that may have seeped into this part of
the motorcycle is allowed to evaporate.
– After the motorcycle has cooled down, oil and grease all sliding and pivot points. Treat the chain with a chain spray too.
– To prevent failures in the electric system, you should treat the ignition lock, the emergency OFF switch, light switch and the socket
connectors with contact spray.

CONSERVATION FOR WINTER OPERATION

26
In the event that the motorcycle is also used in winter and on roads where one has to expect salt spraying, you will have to take pre-
cautions against the aggressive road salt.
– clean motorcycle thoroughly and let it dry
– treat engine, carburetor, swing arm, and all other bare or galvanized parts (except for brake discs) with a wax-based anti-corrosion
agent.
 WARNING 
KEEPANTI-CORROSION AGENT FROM GETTING INTO CONTACT WITH THE BRAKE DISCS, FOR OTHERWISE THIS WILL SIGNIFICANTLY REDUCE THE BRAKING
POWER.

! CAUTION !
AFTER RIDES ON SALTED ROADS, CLEAN MOTORCYCLE THOROUGHLY WITH COLD WATER AND LET IT DRY WELL!

STORAGE
Should you desire to make a pause over a longer space of time, please observe the following instructions:
– Clean motorcycle thoroughly (see chapter: CLEANING)
– Check antifreezer and amount of cooling liquid.
– Let the engine warm up again.
– Drain fuel from float chamber of the carburetor. By this means, carburetor jets are prevented from becoming resinous by the old fuel.
– Remove spark plug, and fill approx. 5 ccm engine oil into the cylinder via the spark plug hole. Start for 5 seconds in order to
spread the engine oil, and reinstall spark plug.
– Let fuel flow out of tank into an appropriate container.
– Correct tire pressure.
– Lubricate pivot points of the control levers, foot rests, etc. as well as the chain.
– Servicing the shock absorber linkage and swing arm bearings.
– Remove and charge battery (see chapter: BATTERY).
– The storage place should be dry and not subject to excessive temperature fluctuations.
– Cover the motorcycle with an air permeated tarpaulin or blanket. Do not use non air permeable materials as a possible humidity
might not be able to escape and could cause corrosion.
! CAUTION !
ITIS EXTREMELY BAD TO LET THE ENGINE RUN FOR SHORT PERIODS OF TIME WHEN THE MOTORCYCLE IS KEPT IN STORAGE. SINCE IN THIS CASE THE ENGINE
WOULD NOT GET WARM ENOUGH, THE STEAM PRODUCED DURING THE COMBUSTION PROCESS WOULD CONDENSE AND CAUSE RUSTING ON CRANKSHAFT,
MAIN BEARING, AND EXHAUST SYSTEM.

RE-INITIATION AFTER TIME OF STORAGE

– Mount the charged battery (watch out for polarity, RED = +)
– Fill up tank with fresh fuel and turn the fuel tap to the ON position.
– Check motorcycle as before each start.
– Take a short, careful test ride first.
 TECHNICAL SPECIFICATIONS - CHASSIS KTM 125 LC2 ‘98

Frame Central chrome-moly-steelframe

Fork Type Paioli Ø 41mm (1.6 in)
Suspension travel 240 mm (9.5 in)
Spring preload 44 mm (1.7 in)
Oil capacity per fork leg / viscosity 485 ccm / SAE 10
Rear wheel suspension Central shock absorber with PRO LEVER linkage to needle-bearing mounted aluminium swingarm
Shock absorber Type Paioli MC56

ENGLISH
Suspension travel 280 mm (11 in)
Spring preload 14 mm (0.55 in)
Front brake Disk brake with perforated brake disk Ø 260 mm (10,2 in), brake caliper floated
Rear brake Disk brake with perforated brake disk Ø 220 mm (8,7 in), brake caliper floated
Tire front 2.75/21“ 45P Bridgestone Trail Wing 25
Air pressure, driver only 1.8 bar (26 psi)
Air pressure driver plus passenger 2.0 bar (29 psi)
Tire rear 4.10/18“ 59P Bridgestone Trail Wing 26
Air pressure, driver only 2.0 bar (29 psi) 27
Air pressure driver plus passenger 2.2 bar (32 psi)
Fuel tank capacity 8.5 liter (2.2 US gallons), of that 3.0 liter (0.8 US gallons) reserve
Rear wheel transmission ratio 13:50 / 13:45
Chain O-ring 5/8 x 1/4"
Battery 12V 3Ah maintenance free
Lamps head light H4 12V 60/55W (socket P 43 t)
parking light 12V 5W (socket W 2,1x9,5 d)
cockpit lights 12V 2W (socket W 2x4,6 d)
stop and tail light 12V 21/5W (socket BaY 15 d)
flasher 12V 10W (socket Ba 15 s)
Steering head angle 63°
Wheel base 1440 ±10 mm (56.7 in ±0.4 in)
Seat high (unloaded) 860 mm (33.8 in)
Ground clearance (unloaded) 300 mm (11.8 in)
Weight with tank filled up 121 kg (267 lbs)
Max. permissible front axle load 133 kg (294 lbs)
Max. permissible rear axle load 217 kg (479 lbs)
Max. permissible laden weight 350 kg (770 lbs)

TORQUES
Collar screw front wheel spindle M 10 40 Nm (30 ft.lbs)
Collar nut rear wheel spindle M 20x1,5 80 Nm (60 ft.lbs)
Hexagon nut swingarm pivot M 14x1,5 100 Nm (74 ft.lbs)
Clamp screws top triple clamp M8 15 Nm (11 ft.lbs)
Clamp screws bottom triple clamp M8 20 Nm (15 ft.lbs)
Hexagon nuts fork leg axle passage M6 5 Nm (4 ft.lbs)
Other screws on chassis M6 10 Nm (7 ft.lbs)
M8 25 Nm (18 ft.lbs)
M10 50 Nm (37 ft.lbs)
 TECHNICAL DATA – ENGINE KTM 125 LC2 ‘98

Design single-cylinder, two-stroke Otto engine with balancer shaft, liquid-cooled

Control membrane inlet into crankcase, exhaust control by means of servomotor and roller
Displacement 124.8 ccm
Bore / stroke 56 / 50.7 mm
Compression ratio 12.5 : 1
Fuel unleaded fuel with a least RON 91
Engine lubrication separate lubrication
ENGLISH

Engine oil Shell Advance VSX 2 or 2-stroke oil for a mix ratio 1 : 50 and separate lubrication
Crankshaft bearing 2 ball bearings
Conrod bearingr needle bearing
Piston pin bearing needle bearing
Piston cast light alloy
Piston rings 1 half keystone ring, 1 rectangular ring
Primary drive helical gears 22:73 Z
28
Clutch multi disk clutch in oil bath
Transmission 6-speed shift dog operated
Transmission reduction 1st gear 34:12 4th gear 24:21
2nd gear 30:16 5th gear 22:23
3rd gear 24:17 6th gear 18:22
Gear oil 0,75 liter (0,2 US gallons) engine oil SAE 10W30 (Shell Advance Ultra)
Ignition system breakerless CDI ignition system with digital ignition timing
Generator 12V / 95W
Spark plug NGK BR9ES (NGK BR8ES)
Electrode distance 0.7 mm ± 0.1 mm (0.03 in)
Cooling system liquid cooling, permanent circulation of cooling liquid effected by water pump
Cooling liquide 0.8 Liter (0,2 US gallons), 40% antifreezer, 60% water, at least -25° C (-13° F)
Carburetor slide carburetor
Air filter wet foam type air filter insert
Oil tank tank content: 1,3 liter (0,34 US gallons)

BASIC CARBURETOR SETTING 125 LC2

80 kmh with KAT 100 kmh with KAT 100 kmh without KAT
Type Dell’Orto PHBH 28 VS Dell’Orto PHBH 28 VS Dell’Orto PHBH 28 VS
Carburettor setting number 4171 4171 4175
Main jet 132 132 132
Needle jet GM1 264 GM1 264 GM1 264
Idling jet 50 50 52
Starting jet 70 70 70
Jet needle 83 83 83
Needle position from top 3 3 3
Mixture adjusting screw open 4 turns 4 turns 4 turns
Throttle slide 40 40 30
KTM-SPORTMOTORCYCLE AG
A-5230 Mattighofen • Postfach 91 • Austria
I n t e r n e t : h t t p : / / w w w. k t m . c o . a t
FN 102019 d - Landesgericht Ried im Innkreis