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ENGLISH

19

Telescopic fork maintenance *

The telescopic fork must be serviced at least once a year. 
To service the fork, proceed as follows:
Prop up the motorcycle under the frame to take the load off the front
wheel.
Disassemble the front wheel, remove screw 

1

from the brake caliper and

unscrew holding clamp. Measure the projection of the fork legs at the upper
fork stabilizer and make a note of the measurement.
Loosen the clamping screws 

2

on the fork stabilizers and pull the fork legs

down out of the fork stabilizers.

!

CAUTION

!

– D

O NOT OPERATE THE HAND BRAKE WHEN THE FRONT WHEEL HAS BEEN

DISMOUNTED

.

– M

AKE SURE THE BRAKE DISC IS ALWAYS ON TOP WHEN YOU LAY DOWN THE WHEEL

,

OTHERWISE THE BRAKE DISC CAN BE DAMAGED

.

Clamp the fork leg into a vise (use protective jaws) and remove the 
plugs 

3

. Take the preload spacer and the spring out of the fork tube.

Remove screws 

4

at the underside of the slider tubes and pull the fork

tubes out of the slider tubes.
Remove the dust scrabbers 

5

.

Thoroughly clean all parts and check for wear.
Generously lubricate seals and springs and reassemble the telescopic fork.
Tighten the screws on the bottom of the sliding tubes to 30 Nm.
Fill in fork oil and assemble the fork (see below). Degrease the screws on the
brake caliper and apply Loctite 243. Mount the brake caliper and tighten to
20 Nm. Mount brake line and holding clamp.
Insert fork legs in the fork stabilizers (projection as previously noted) and
tighten clamping screws to 15 Nm.
Mount front wheel (see chapter:  mounting the front wheel).

WARNING

T

HE SCREWS

1

MUST BE SECURED WITH

L

OCTITE

243.

Changing the telescopic fork oil *

Remove front wheel and fork legs (see above).
Remove plugs, preload spacers and springs.
Drain the fork oil into an appropriate container.
Clean the dust scrabbers.

WARNING

– I

T IS VERY IMPORTANT TO KEEP THE BRAKE DISK FREE FROM OIL AND FATTY MATTERS

.

O

THERWISE

THE BRAKING EFFECT WOULD BE STRONGLY REDUCED

.

– A

FTER WORKING ON THE BRAKE SYSTEM

ALWAYS OPERATE THE HAND BRAKE LEVER

TO APPLY THE BRAKE SHOES TO THE BRAKE DISK AND HAVE A POINT OF PRESSURE

.

Pour 170 cm

3

SAE 7.5 fork oil into each fork tube.

Slide the fork tube all the way into the slider tube.
Adjust the air-chamber length 

A

to 110 mm (4.5 in) by extracting or adding

fork oil.
Insert springs and pretensioning sleeves into the fork tube.
Check O-rings, grease and mount plugs.
Mount the fork legs, front wheel and brake caliper (see above).

4

3

A

1

5

2

2

Summary of Contents for 50 SX PRO JUNIOR LC 2003

Page 1: ...OWNER S MANUAL MANUALE D USO MANUEL D UTILISATION MANUAL DE INSTRUCCIONES 2003 BEDIENUNGSANLEITUNG Art Nr 3 210 46 4 2002 50 SX PRO JUNIOR LC 50 SX PRO SENIOR LC...

Page 2: ...FOLLOWS WARNING IGNORING THESE INSTRUCTIONS CAN BE DANGEROUS TO LIFE AND LIMB CAUTION IGNORING THESE INSTRUCTIONS MAY DAMAGE PARTS OF THE MOTORCYCLE OR IMPAIR THE MOTORCYCLE S TRAFFIC SAFETY KTM SPOR...

Page 3: ...ng from the use of such products When special needs arise please contact a KTM dealer who will seek the assistance of the KTM importer if necessary PARENTS SHOULD KEEP IN MIND that the safety of their...

Page 4: ...must be performed by a KTM workshop and recorded in the service manual otherwise claims under the warranty shall become void The fuels and lubricants specified in the Owner s Manual or automotive flu...

Page 5: ...nical checks himself herself as well Whenever you go for a ride with your youngster keep in mind that the speed should be adjusted to your youngster and not the other way around Your youngster must un...

Page 6: ...the weight of the driver 18 To determine the sag of the shock absorber 18 To determine the sag of the telescopic fork 18 Telescopic fork maintenance 19 Changing the telescoping fork oil 19 Cleaning th...

Page 7: ...CH Throttle grip The throttle grip is located on the right side of the handlebars It is used to reduce the engine speed and thus the driving speed Hand brake lever The hand brake lever is located on t...

Page 8: ...ngine can draw in additional fuel This results in a rich fuel air mixture required for a cold start Moving the choke lever back closes the hole in the carburetor again Choke Dell Orto carburetor PHBG...

Page 9: ...ft side of the frame for the plug in stand 1 included in the scope of supply Rebound damping function of the shock absorber The damping effect of the rebound damping mechanism can be adjusted by means...

Page 10: ...ENGLISH 9...

Page 11: ...tood what you explained We recommend to review the entire owner s manual with your youngster item by item paying particular attention to the specially marked warnings and pointing out the danger of in...

Page 12: ...ely worn chain may tear and insufficient lubrication may result in unnecessary wear of the chain and chain wheels 5 TIRES Check for damaged tires Tires showing cuts or dents must be replaced Also chec...

Page 13: ...1 2 Kick the side up all the way or remove the plug in stand 3 Apply the front brake 4 Operate the kickstarter depressing it all the way without opening the throttle What to do when the engine is floo...

Page 14: ...HE EXHAUST SYSTEM AND THE BRAKES CAN HEAT UP CONSIDERABLY MAKE SURE THAT THESE PARTS ARE NOT TOUCHED AND ALWAYS TAKE CARE WHEN PARKING THE MOTORCYCLE THAT OTHER PERSONS WILL NOT BURN THEMSELVES CAUTIO...

Page 15: ...rake control cable for damage Check function adjust smooth operation free travel of handbrake footbrake levers Check screws of brake system for a tight fit Check suspension strut and fork for leaks an...

Page 16: ...egular intervals for cross country use once a year after every cleaning before each start RECOMMENDED INSPECTION OF THE MINI LC ENGINE BY YOUR KTM WORKSHOP ADDITIONAL ORDER FOR THE KTM WORKSHOP Check...

Page 17: ...ONGER PERIODS THE BEARINGS AND SUBSEQUENTLY THE BEARING SEATS IN THE FRAME WILL BE DESTROYED At least once a year the steering head bearings should be smeared with waterproof grease Shell Advance Grea...

Page 18: ...LY OTHERWISE THE BEARINGS WILL BE DAMAGED IF YOU DRIVE WITH PLAY IN THE STEERING HEAD BEARING FOR LONGER PERIODS THE BEARINGS AND SUBSEQUENTLY THE BEARING SEATS IN THE FRAME WILL BE DESTROYED At least...

Page 19: ...driver seated dimension B 355 mm Sag 45 mm 50 SX Pro Junior LC shock absorber sag 45 mm 5 mm 50 SX Pro Senior LC shock absorber sag 50 mm 5 mm If the sag is lower the spring preload of the shock abso...

Page 20: ...n the screws on the bottom of the sliding tubes to 30 Nm Fill in fork oil and assemble the fork see below Degrease the screws on the brake caliper and apply Loctite 243 Mount the brake caliper and tig...

Page 21: ...NG IF CHAIN TENSION IS TOO GREAT PARTS WITHIN THE SECONDARY TRANSMISSION CHAIN CHAIN WHEELS GEAR BOX AND REAR WHEEL BEARINGS WILL BE SUBJECTED TO UNNECESSARY STRESS RESULTING IN PREMATURE WEAR AND EVE...

Page 22: ...ICE LIMIT HAVE ANY REPAIRS ON THE BRAKE SYSTEM BE PERFORMED BA A KTM DEALER BRAKE CALIPERS Secure the screws on the brake caliper with Loctite 243 and tighten to a torque of 20 Nm Setting the basic po...

Page 23: ...SE THE BRAKING EFFECT WOULD BE STRONGLY REDUCED AFTER ASSEMBLY CHECK IF CIRCLIPS HAVE BEEN FITTED CORRECTLY DO NOT UNSCREW ANY OTHER SCREWS ON THE BRAKE CALIPER OR YOU WILL HAVE TO BLEED THE BRAKE SYS...

Page 24: ...ING TORQUE CORRECTED BY A KTM DEALER AS SOON AS POSSIBLE A LOOSE AXLE MAY LEAD TO AN UNSTABLE DRIVING BEHAVIOR OF YOUR MOTORCYCLE AFTER MOUNTING THE FRONT WHEEL KEEP OPERATING THE HAND BRAKE UNTIL THE...

Page 25: ...ary have the spokes retightened and the wheel centered by a KTM dealer WARNING SPOKES CAN TEAR IF YOU CONTINUE TO RIDE WITH THEM LOOSE THIS MAY LEAD TO AN UNSTABLE HANDLING OF YOUR MOTORCYCLE EXCESSIV...

Page 26: ...special cleaning fluid and allow it to dry well Only press out the filter do not wring it out under any circumstances Oil the dry foam filter with a high grade filter oil Also clean the air filter bo...

Page 27: ...15 Nm the screw on the shock absorber to 45 Nm WARNING THE FORK TUBES MAY NOT BE LOWERED ANY FURTHER THAN AS DESCRIBED ABOVE OTHERWISE THE CLAMPING ON THE UPPER FORK STABILIZER WILL NO LONGER BE ADEQU...

Page 28: ...SE BRANDED PRODUCTS SHELL Donax TA Changing gear oil The engine must be warmed up before changing the gear oil Park the motorcycle on a horizontal surface remove the oil drain plug 3 and drain the use...

Page 29: ...choke Close fuel tap loosen fuel hose at carburettor lead into a basin and open fuel tap if fuel leaks out clean carburettor if no fuel leaks out check tank ventilation i e clean fuel tap Reduce elect...

Page 30: ...ed water hoses Incorrect ignition timing because of loose stator screws Incorrect compression ratio Cylinder head or O ring of cylinder head gasket leaks Excessive oil quantity in transmissi on REMEDY...

Page 31: ...ds of time please observe the following instructions Clean motorcycle thoroughly see chapter CLEANING Change engine oil old engine oil contains aggressive contaminations Check antifreeze and amount of...

Page 32: ...er automatic gear oil Dexron II Shell Donax TA Spark plug NGK BR 8 ECM Electrode gap 0 6 mm Carburetor DellOrto PHVA 14 DS Dell Orto PHBG 19 BS Air filter wet foam type air filter insert Cooling liqui...

Page 33: ...Marzocchi 32 mm 1 26 in Wheel travel front rear 135 200 mm 5 3 8 in 175 185 mm 6 9 7 4 in Rear suspension Central shock absorber WP Front brake Disk brake 160 mm 6 4 in Rear brake Drum brake 90 mm 3 5...

Page 34: ...ng 12 Driving instructions 11 Drum brake maintenance 23 Engine number engine type 6 Exhaust system 25 Filler cap 7 Foot brake lever 8 Fuel tap 7 Page General tips and warnings for starting the motorcy...

Page 35: ...KTM SPORTMOTORCYCLE AG 5230 Mattighofen Austria Internet www ktm at 321046...

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