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MAINTENANCE WORK ON CHASSIS AND ENGINE 

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ENGLISH

26

Tires, air pressure

Tire type, tire condition, and air pressure level affect the way your motorcycle

rides, and they must therefore be checked whenever you are getting ready to

go anywhere on your motorcycle.

– Tire size can be found in the technical specifications.

– Tire condition has to be checked every time you want to ride your motor-

cycle. Before leaving, check tires for punctures and nails or other sharp

objects that might have become embedded in them.

– Regularly check the "cold" tire pressure. Correct tire pressure (1.0 bar /

14 psi) guarantees optimum grip and maximum tire life.

– Damaged tires must be replaced immediately to protect your youngster.

– Worn tires can have a negative effect on how the motorcycle performs,

especially on wet surfaces

– Tire pressure below the normal level will lead to premature tire wear.

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, at regular intervals. If necessary, have

the spokes retightened and the wheel centered by a KTM dealer.

– Spokes can tear if you continue to ride with them loose. This may lead to

an unstable handling of your motorcycle.

– Excessively tensioned spokes may rupture due to local overloading. The

spokes must be tensioned to 2.5 - 3 Nm.

Cooling system

The water pump 

[1]

in the engine keeps the cooling liquid in circulation.

The cooling liquid is cooled by the air stream. Therefore, the cooling effect

is reduced when the  traveling speed is reduced. Dirty radiators additionally

reduce the cooling effect.

The cooling liquid can be drained by removing screw 

[2]

on the water-pump

cover.

Do not remove any cooler hoses or the drain screw when the engine is hot.

A mixture of 50 % antifreeze and 50 % distilled water is used as the cooling

liquid. How-ever, the antifreeze protection must be at least -25° C (-13° F).

This mixture offers antifreeze protection but also good corrosion protection

and should therefore not be replaced by pure water.

For the cooling system, use only with high-grade antifreeze (Motorex Anti-Freeze).

Using lower-grade antifreeze agents can cause corrosion and coolant 

foaming.

Pressure induced by heating of the coolant in the system is controlled by 

a valve in the radiator cap 

[3]

; a water temperature rising up to 120° C 

(248° F) is admissible without fear of problems.

1

2

3

Summary of Contents for 50 SX 2008

Page 1: ...KTM Sportmotorcycle AG A 5230 Mattighofen www ktm com KTM Group Partner 4 2007 FOTO MITTERBAUER 50 SX JUNIOR 50 SX OWNER S MANUAL 2008 3211222en 3211222en 3211222en...

Page 2: ...rtain models without previous notice KTM shall not be held liable for any deviations of availabil ity and or ability to deliver illustrations descriptions printing and or other errors The illustrated...

Page 3: ...cycle is sold SERVICE Observance of the service maintenance and tuning instructions for the engine and chassis specified in the Owner s Manual is a prerequisite for faultless operation and the avoida...

Page 4: ...rains Nevertheless driving the motorcycle like driving any other vehicle involves a potential risk Therefore please make sure that all fundamental precautions are taken Please also read the INFORMATIO...

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: ...telescopic fork oil 19 Cleaning the dust scrabbers of the telescopic fork 20 Page Changing spring preloading of the shock absorber 20 Check chain tension 20 Correct chain tension 20 Chain maintenance...

Page 7: ...s number is located on the type plate on the steering head Enter this number in the field on page no 1 Engine number The engine number is stamped into the right half of the engine case next to the kic...

Page 8: ...child s hand Short circuit button The short circuit button 1 turns off the engine When pressing this button the ignition circuit is short circuited Filler cap To open it turn filler cap counter clock...

Page 9: ...pull the choke control knob up to the stop and turn it 90 a hole is opened in the carburetor through which the engine can draw additional fuel This results in a rich fuel air mixture required for a co...

Page 10: ...ob clockwise to increase damping turn it counter clockwise to reduce damping during rebounding STANDARD ADJUSTMENT turn the adjusting screw clockwise to the stop then turn the adjusting screw counterc...

Page 11: ...blic roads Always keep in mind that other people feel molested by exces sive noise Instructions for the first ride Make sure the work for the pre delivery inspection was per formed by your authorized...

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: ...TE The highly inflammable components in modern fuels volatilize if left stand ing for longer periods of time If the motorcycle has not been used for over 1 week the fuel should be drained from the flo...

Page 14: ...left foot down To turn off the engine press the short circuit button until the engine stops Close the fuel tap Motorcycles produce great heat during operation Therefore keep in mind that the engine th...

Page 15: ...n and kinkless arrangement adjust and lubricate z z z Clean air filter and air filter box z z z BRAKES Check brake fluid level lining thickness brake discs z z Check the brake line and the brake contr...

Page 16: ...Check fuel line for leaks z Drain and clean float chamber z Verify smooth operation of all controls z Treat exposed metal components except for the brake and exhaust systems z with wax based anti cor...

Page 17: ...play in the steering head bearing for longer 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 wi...

Page 18: ...easily 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...

Page 19: ...nd with driver seated dimension B 355 mm Sag 45 mm 50 SX Junior shock absorber sag 45 mm 5 mm 50 SX shock absorber sag 50 mm 5 mm If the sag is lower the spring preload of the shock absorber must be r...

Page 20: ...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 cal...

Page 21: ...upwards the distance to the swingarm has to be 10 mm 0 4 in If necessary correct chain tension If chain tension is too great parts within the secondary transmission chain chain wheels gear box and rea...

Page 22: ...r pockets may form in old brake fluids even at low temperatures causing the brake system to fail BRAKE DISC Due to wear the thickness of the brake disc in the area of the contact face 1 of the brake p...

Page 23: ...ake pads Inspect the brake pads from in front of the vehicle The linings must be at least 1 mm 0 04 in thick At their most worn point brake pad linings should not be thinner than 1 mm 0 04 in otherwis...

Page 24: ...d stop roller 5 Using the push rod 6 the free play on the foot brake pedal must be set Measured on the outside the foot brake pedal must have 3 5 mm of free play before the push rod can move the pisto...

Page 25: ...the point of pressure again Never use DOT5 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 childr...

Page 26: ...rwise the braking effects would be strongly reduced Removing and mounting the rear wheel Prop up the motorcycle under the frame Remove hexagon nut 3 on the wheel spindle and disk Hold the rear wheel a...

Page 27: ...r intervals If necessary have the spokes retightened and the wheel centered by a KTM dealer Spokes can tear if you continue to ride with them loose This may lead to an unstable handling of your motorc...

Page 28: ...Bio Dirt Remover 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 Motorex Liquid Bio Power Also clea...

Page 29: ...bilizers to 25 Nm top and 10 Nm bottom the screw on the shock absorber to 45 Nm The fork tubes may not be lowered any further than as described above oth erwise the clamping on the upper fork stabiliz...

Page 30: ...Therefore only use branded products Motorex ATF Super Changing gear oil The engine must be warmed up before changing the gear oil Park the motor cycle on a horizontal surface remove the oil drain plug...

Page 31: ...em no 590 29 021 044 onto the clutch hub 6 with the M5x50 screws hold the extractor and remove the centrifu gal clutch from the crankshaft by screwing in the extractor screw Completely remove the cent...

Page 32: ...stration If only one disk is installed you can go ahead and use it The inner diameter of the centrifugal clutch drum may not exceed 84 4 mm new condition 84 0 mm 12 11 8 10 6 7 Assemble in the reverse...

Page 33: ...tap if fuel leaks out clean carburettor if no fuel leaks out check tank ventilation i e clean fuel tap Reduce electrode distance 0 60 mm Clean spark plug or renew Dismount spark plug connect ignition...

Page 34: ...ne overheating Insufficient liquid in cooling system Radiator fins clogged Frothing in cooling system The motorcycle is being driven too slowly the clutch keeps slipping causing heat to develop Pinche...

Page 35: ...or their function and wear Should any service jobs repairs or any refitting be necessary you should have them carried out during the off season lower workload at mechanics shops This way you can avoid...

Page 36: ...Topspeed 4T 15W50 Spark plug NGK BR 8 ECM Electrode gap 0 6 mm Carburetor Dell Orto PHVA 14 DS Dell Orto PHBG 19 BS Air filter wet foam type air filter insert Cooling liquid 0 5 litres 50 antifreeze...

Page 37: ...6 26 6 in Ground clearance 220 mm 8 6 in 255 mm 10 in Rider s body height max 130 cm 51 in Rider s body weight max 35 kg 78 lbs Recommended age of rider 4 7 years 6 10 years Engine 50 LC TIGHTENING T...

Page 38: ...g system 26 Correct chain tension 20 Driving 12 Driving instructions 11 Drum brake maintenance 50 SX Junior 23 Engine number 6 Exhaust system 27 Page Filler cap 7 Foot brake lever 8 Fuel tap 7 General...

Page 39: ...ENGLISH 38...

Page 40: ...ENGLISH 39...

Page 41: ...ENGLISH 40...

Page 42: ...KTM Sportmotorcycle AG A 5230 Mattighofen www ktm com KTM Group Partner 4 2007 FOTO MITTERBAUER 50 SX JUNIOR 50 SX OWNER S MANUAL 2008 3211222en 3211222en 3211222en...

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