KTM 50 SX Mini 2013 Owner's manual
OWNER'S MANUAL 2013
50 SX
50 SX Mini
Art. no. 3211854en
DEAR KTM CUSTOMER 1
DEARKTM CUSTOMER
Congratulations on your decision to purchase a KTM motorcycle. You are now the owner of a state-of-the-art sports motorcycle that will
give you and your child enormous pleasure if you service and maintain it accordingly.
We wish you a lot of enjoyment in riding this vehicle.
Enter the serial numbers of your vehicle below.
Chassis number ( p. 10) Dealer's stamp
Engine number ( p. 10)
The Owner's Manual corresponded to the latest state of this series at the time of printing. Slight deviations resulting from continuing
development and design can, however, not be completely excluded.
All specifications are non-binding. KTM Sportmotorcycle AG specifically reserves the right to modify or delete technical specifications, prices, colors, forms, materials, services, designs, equipment, etc., without prior notice and without specifying reasons, to adapt
these to local conditions, as well as to stop production of a particular model without prior notice. KTM accepts no liability for delivery
options, deviations from illustrations and descriptions, as well as misprints and other errors. The models portrayed partly contain special equipment that does not belong to the regular scope of delivery.
© 2012 KTM-Sportmotorcycle AG, Mattighofen Austria
All rights reserved
Reproduction, even in part, as well as copying of all kinds, is permitted only with the express written permission of the copyright
owner.
ISO 9001(12 100 6061)
According to the international quality management standard ISO 9001, KTM uses quality assurance processes that lead
to the maximum possible quality of the products.
Issued by: TÜV Management Service
KTM-Sportmotorcycle AG
5230 Mattighofen, Austria
TABLE OF CONTENTS 2
TABLEOF CONTENTS
1 MEANS OF REPRESENTATION ..................................... 4
1.1 Symbols used ................................................... 4
1.2 Formats used.................................................... 4
2 SAFETY ADVICE........................................................... 5
2.1 Use definition - intended use ............................. 5
2.2 Safety advice.................................................... 5
2.3 Degrees of risk and symbols ............................... 5
2.4 Tampering warning............................................ 5
2.5 Safe operation .................................................. 5
2.6 Protective clothing ............................................ 6
2.7 Work rules........................................................ 6
2.8 Environment..................................................... 6
2.9 Owner's Manual ................................................ 6
3 IMPORTANT INFORMATION ......................................... 7
3.1 Guarantee, warranty .......................................... 7
3.2 Operating and auxiliary substances ..................... 7
3.3 Spare parts, accessories .................................... 7
3.4 Service ............................................................ 7
3.5 Figures ............................................................ 7
3.6 Customer service............................................... 7
4 VIEW OF VEHICLE ....................................................... 8
4.1 View of the vehicle from the left front
(example)......................................................... 8
4.2 View of the vehicle from the right rear
(example)......................................................... 9
5 SERIAL NUMBERS .................................................... 10
5.1 Chassis number .............................................. 10
5.2 Type label ...................................................... 10
5.3 Engine number ............................................... 10
5.4 Fork part number ............................................ 10
5.5 Shock absorber part number ............................ 11
6 CONTROLS................................................................ 12
6.1 Hand brake lever............................................. 12
6.2 Throttle grip ................................................... 12
6.3 Kill switch...................................................... 12
6.4 Opening filler cap ........................................... 12
6.5 Closing filler cap............................................. 13
6.6 Opening oil tank cap (50 SX Mini).................... 13
6.7 Closing oil tank cap (50 SX Mini) ..................... 13
6.8 Fuel tap ......................................................... 13
6.9 Choke (50 SX) ................................................ 14
6.10 Choke (50 SX Mini)......................................... 14
6.11 Kickstarter ..................................................... 14
6.12 Foot brake lever .............................................. 14
6.13 Plug-in stand .................................................. 14
7 PREPARING FOR USE................................................ 15
7.1 Advice on first use .......................................... 15
7.2 Running in the engine ..................................... 16
8 RIDING INSTRUCTIONS............................................. 17
8.1 Checks and maintenance measures when
preparing for use............................................. 17
8.2 Starting.......................................................... 17
8.3 Starting up ..................................................... 18
8.4 Riding............................................................ 18
8.5 Braking.......................................................... 18
8.6 Stopping, parking............................................ 18
8.7 Transport ....................................................... 19
8.8 Refueling ....................................................... 19
8.9 Filling up with oil (50 SX Mini) ........................ 20
9 SERVICE SCHEDULE ................................................. 21
9.1 Service schedule............................................. 21
10 TUNING THE CHASSIS .............................................. 23
10.1 Adjusting the rebound damping of the shock
absorber......................................................... 23
10.2 Measuring rear wheel sag unloaded................... 23
10.3 Checking the static sag of the shock absorber.... 23
10.4 Checking the riding sag of the shock absorber.... 24
10.5 Adjusting the spring preload of the shock
absorber x.................................................... 24
10.6 Adjusting the riding sag x.............................. 25
10.7 Handlebar position.......................................... 25
10.8 Adjusting handlebar position x....................... 25
10.9 Adjusting seat height x.................................. 26
11 MAINTENANCE WORK ON THE CHASSIS .................... 27
11.1 Raising the motorcycle with a lift stand ............. 27
11.2 Removing the motorcycle from the lift stand ...... 27
11.3 Cleaning the dust boots of the fork legs............. 27
11.4 Removing the fork protector x ........................ 28
11.5 Installing the fork protector x......................... 28
11.6 Removing the fork legs x ............................... 28
11.7 Installing the fork legs x ................................ 29
11.8 Removing the lower triple clamp x.................. 29
11.9 Installing the lower triple clamp x .................. 30
11.10 Checking play of steering head bearing ............. 31
11.11 Adjusting the play of the steering head
bearing x ..................................................... 32
11.12 Greasing the steering head bearing x .............. 32
11.13 Dismounting the start number plate .................. 33
11.14 Installing the start number plate....................... 33
11.15 Dismounting the front fender ........................... 33
11.16 Installing the front fender ................................ 33
11.17 Removing the shock absorber x ...................... 34
11.18 Installing shock absorber x ............................ 34
11.19 Removing the seat .......................................... 34
11.20 Mounting the seat ........................................... 35
11.21 Removing the air filter x ................................ 35
11.22 Installing the air filter x................................. 35
11.23 Cleaning the air filter and air filter box x ......... 36
11.24 Removing main silencer................................... 36
11.25 Installing the main silencer.............................. 37
11.26 Changing the glass fiber yarn filling of the
main silencer x............................................. 37
11.27 Removing the chain guard (50 SX) ................... 37
11.28 Installing the chain guard (50 SX) .................... 38
11.29 Removing the engine sprocket cover x ............ 38
11.30 Installing the engine sprocket cover x ............. 38
11.31 Checking the chain for dirt............................... 38
11.32 Cleaning the chain .......................................... 39
11.33 Checking the chain tension .............................. 39
11.34 Adjusting chain tension ................................... 40
11.35 Checking the chain, rear sprocket, engine
sprocket and chain guide ................................. 40
11.36 Adjusting the chain guide x ........................... 42
11.37 Checking the frame x .................................... 43
11.38 Checking the swingarm x............................... 43
11.39 Checking the throttle cable routing ................... 43
11.40 Checking the rubber grip ................................. 44
11.41 Additionally securing the rubber grip................. 44
12 BRAKE SYSTEM ........................................................ 45
12.1 Checking play of handbrake lever ..................... 45
12.2 Adjusting the play of the hand brake lever ......... 45
12.3 Adjusting the basic position of the hand brake
lever .............................................................. 45
TABLE OF CONTENTS 3
12.4 Checking brake discs....................................... 46
12.5 Checking front brake fluid level ........................ 46
12.6 Adding front brake fluid x.............................. 47
12.7 Checking the front brake linings ....................... 48
12.8 Removing front brake linings x....................... 48
12.9 Installing the front brake linings x .................. 48
12.10 Changing the front brake linings x.................. 49
12.11 Checking the free travel of the foot brake
lever .............................................................. 50
12.12 Adjusting the free travel of the foot brake
lever x ......................................................... 50
12.13 Adjusting the basic position of the foot brake
lever x ......................................................... 50
12.14 Checking rear brake fluid level ......................... 51
12.15 Adding rear brake fluid x ............................... 51
12.16 Checking the rear brake linings ........................ 52
12.17 Removing rear brake linings x ........................ 52
12.18 Installing the rear brake linings x ................... 53
12.19 Changing the rear brake linings x ................... 54
13 WHEELS, TIRES ........................................................ 55
13.1 Removing the front wheel x ........................... 55
13.2 Installing the front wheel x ............................ 55
13.3 Removing rear wheel x .................................. 56
13.4 Installing the rear wheel x.............................. 56
13.5 Checking the tire condition .............................. 56
13.6 Checking tire air pressure ................................ 57
13.7 Checking spoke tension ................................... 57
14 COOLING SYSTEM ..................................................... 59
14.1 Cooling system ............................................... 59
14.2 Checking the antifreeze and coolant level .......... 59
14.3 Checking the coolant level ............................... 60
14.4 Draining the coolant x................................... 60
14.5 Refilling coolant x......................................... 61
15 TUNING THE ENGINE................................................ 62
15.1 Checking the installation position of the
throttle grip .................................................... 62
15.2 Checking the play of the throttle cable .............. 62
15.3 Adjusting the play in the throttle cable x......... 62
15.4 Carburetor - idle (50 SX).................................. 63
15.5 Carburetor - idle (50 SX Mini) .......................... 63
15.6 Carburetor - adjusting idle speed x (50 SX) ..... 63
15.7 Carburetor - adjusting idle speed x
(50 SX Mini) .................................................. 64
15.8 Emptying the carburetor float chamber x......... 65
15.9 Checking the clutch setting x......................... 65
15.10 Removing the clutch cover x .......................... 66
15.11 Adjusting the clutch x ................................... 66
15.12 Installing the clutch cover x........................... 67
16 SERVICE WORK ON THE ENGINE ............................... 68
16.1 Checking oil level (50 SX Mini) ........................ 68
16.2 Bleeding the oil pump x (50 SX Mini)............. 68
16.3 Checking the gear oil level ............................... 69
16.4 Changing the gear oil x.................................. 69
16.5 Draining the gear oil x................................... 70
16.6 Filling up with gear oil x................................ 70
16.7 Adding gear oil x........................................... 70
17 CLEANING, CARE ...................................................... 72
17.1 Cleaning motorcycle ........................................ 72
18 STORAGE.................................................................. 73
18.1 Storage.......................................................... 73
18.2 Preparing for use after storage.......................... 73
19 TROUBLESHOOTING ................................................. 74
20 TECHNICAL DATA...................................................... 76
20.1 Engine........................................................... 76
20.2 Engine tightening torques ................................ 76
20.3 Carburetor with carburetor tuning ..................... 77
20.3.1 50 SX........................................................ 77
20.3.2 50 SX Mini ................................................ 77
20.4 Capacities...................................................... 77
20.4.1 Gear oil...................................................... 77
20.4.2 Coolant...................................................... 77
20.4.3 Fuel .......................................................... 77
20.5 Chassis.......................................................... 77
20.6 Tires.............................................................. 78
20.7 Fork............................................................... 78
20.7.1 50 SX Mini ................................................ 78
20.7.2 50 SX........................................................ 79
20.8 Shock absorber ............................................... 79
20.8.1 50 SX........................................................ 79
20.8.2 50 SX Mini ................................................ 79
20.9 Chassis tightening torques ............................... 80
21 SUBSTANCES ........................................................... 81
22 AUXILIARY SUBSTANCES .......................................... 83
23 STANDARDS ............................................................. 85
INDEX .............................................................................. 86
1 MEANS OF REPRESENTATION 4
1.1 Symbols used
The symbols used are explained in the following.
Indicates an expected reaction (e.g., to a work step or a function).
Indicates an unexpected reaction (e.g., to a work step or a function).
All work marked with this symbol requires specialist knowledge and technical understanding. In the interest of
the safety of your child, have these jobs performed in an authorized KTM workshop. There, your motorcycle will
be serviced optimally by specially trained experts using the specialist tools required.
Identifies a page reference (more information is provided on the specified page).
1.2 Formats used
The typographical and other formats used are explained in the following.
Proper name Identifies a proper name.
®
Name
Brand™ Identifies a brand in merchandise traffic.
Identifies a protected name.
2 SAFETY ADVICE 5
2.1 Use definition - intended use
KTM sport motorcycles are designed and built to withstand the normal stresses and strains of competitive use. The motorcycles comply with currently valid regulations and categories of the top international motorsport organizations.
Info
The motorcycle may only be used in closed off areas remote from public road traffic.
2.2 Safety advice
A number of safety instructions need to be followed to operate the vehicle safely. Therefore, read this manual carefully. The safety
instructions are highlighted in the text and are referred to at the relevant passages.
Info
The vehicle has various information and warning labels at prominent locations. Do not remove information/warning labels. If
they are missing, you or others may not recognize dangers and may therefore be injured.
2.3 Degrees of risk and symbols
Danger
Identifies a danger that will immediately and invariably lead to fatal or serious permanent injury if the appropriate measures
are not taken.
Warning
Identifies a danger that is likely to lead to fatal or serious injury if the appropriate measures are not taken.
Caution
Identifies a danger that may lead to minor injuries if the appropriate measures are not taken.
Note
Identifies a danger that will lead to considerable machine and material damage if the appropriate measures are not taken.
Warning
Identifies a danger that will lead to environmental damage if the appropriate measures are not taken.
2.4 Tampering warning
Tampering with the noise control system is prohibited. Federal law prohibits the following acts or the causing thereof:
1 The removal or rendering inoperative by any person other than for purposes of maintenance, repair, or replacement, of any device
or element of design incorporated into any new vehicle for the purpose of noise control prior to its sale or delivery to the ultimate
purchaser or while it is in use, or
2 the use of the vehicle after such device or element of design has been removed or rendered inoperative by any person.
Among those acts presumed to constitute tampering are the acts listed below:
1 Removal of, or puncturing the main silencer, baffles, header pipes or any other components which conduct exhaust gases.
2 Removal or puncturing of any part of the intake system.
3 Lack of proper maintenance.
4 Replacing any moving part of the vehicle, or parts of the exhaust or intake system, with parts other than those specified by the
manufacturer.
2.5 Safe operation
Danger
Danger of accidents Danger arising from the rider's judgement being impaired.
– Do not operate the vehicle while under the influence of alcohol, drugs and certain medications or physically or mentally
impaired.
Danger
Danger of poisoning Exhaust gases are toxic and inhaling them may result in unconsciousness and/or death.
– When running the engine, always make sure there is sufficient ventilation, and do not start or run the engine in an enclosed
space without an effective exhaust extraction system.
2 SAFETY ADVICE 6
Warning
Danger of burns Some vehicle components become very hot when the vehicle is operated.
– Do not touch hot components such as exhaust system, radiator, engine, shock absorber, and the brake system. Allow these
components to cool down before starting work on them.
Only operate the vehicle when it is in perfect technical condition, in accordance with its intended use and in a safe and environmentally compatible manner.
The vehicle should only be used by trained persons.
Have malfunctions that impair safety promptly eliminated by an authorized KTM workshop.
Adhere to the information and warning labels on the vehicle.
2.6 Protective clothing
Warning
Risk of injury Missing or poor protective clothing presents an increased safety risk.
– Wear protective clothing (helmet, boots, gloves, pants and jacket with protectors) every time you ride the vehicle. Always
wear protective clothing that is in good condition and meets the legal requirements.
In the interest of your own safety, KTM recommends that you only operate the vehicle while wearing protective clothing.
2.7 Work rules
Special tools are necessary for certain tasks. The tools are not contained in the vehicle but can be ordered under the number in parentheses. E.g.: bearing puller (15112017000)
During assembly, non-reusable parts (e.g. self-locking screws and nuts, seals and seal rings, O-rings, pins, lock washers) must be
replaced by new parts.
In some instances, a thread locker (e.g. Loctite®) is required. The manufacturer instructions for use must be followed.
After disassembly, clean the parts that are to be reused and check them for damage and wear. Change damaged or worn parts.
After you complete the repair or service work, check the operating safety of the vehicle.
2.8 Environment
If you use your motorcycle responsibly, you can ensure that problems and conflicts do not occur. To protect the future of the motorcycle sport, make sure that you use your motorcycle legally, display environmental consciousness, and respect the rights of others.
When disposing of used oil, other operating and auxiliary fluids, and used components, comply with the laws and regulations of the
respective country.
Because motorcycles are not subject to the EU regulations governing the disposal of used vehicles, there are no legal regulations that
pertain to the disposal of an end-of-life motorcycle. Your authorized KTM dealer will be glad to advise you.
2.9 Owner's Manual
It is important that you read this Owner's Manual carefully and completely before making your first trip. The Owner's Manual contains
useful information and many tips on how to operate, handle, and maintain your motorcycle. Only then will you find out how to customize the vehicle ideally for your own use and how you can protect yourself from injury.
Keep the Owner's Manual in an accessible place to enable you to refer to it as needed.
If you would like to know more about the vehicle or have questions on the material you read, please contact an authorized KTM dealer.
The Owner's Manual is an important component of the vehicle and should be handed over to the new owner if the vehicle is sold.
3 IMPORTANT INFORMATION 7
3.1 Guarantee, warranty
The work prescribed in the service schedule must be carried out by an authorized KTM workshop only and confirmed in the customer's
service record and in the KTM dealer.net; otherwise, all warranty claims will be void. No warranty claims can be considered for damage
resulting from manipulations and/or alterations to the vehicle.
Additional information on the guarantee or warranty and the procedures involved can be found in the service record.
3.2 Operating and auxiliary substances
Warning
Environmental hazard Improper handling of fuel is a danger to the environment.
– Do not allow fuel to get into the ground water, the ground, or the sewage system.
Use operating and auxiliary substances (such as fuel and lubricants) as specified in the Owner's Manual.
3.3 Spare parts, accessories
For your own safety, only use spare parts and accessory products that are approved and/or recommended by KTM and have them
installed by an authorized KTM workshop. KTM accepts no liability for other products and any resulting damage or loss.
Certain spare parts and accessory products are specified in parentheses in the descriptions. Your KTM dealer will be glad to advise
you.
The current KTM PowerParts for your vehicle can be found on the KTM website.
International KTM Website: http://www.ktm.com
3.4 Service
A prerequisite for perfect operation and prevention of premature wear is that the service, care, and tuning work on the engine and
chassis is properly carried out as described in the Owner's Manual. Incorrect adjustment and tuning of the engine and chassis can
lead to damage and breakage of components.
Use of the vehicle under difficult conditions, such as on sand or on wet and muddy surfaces, can lead to considerably more rapid wear
of components such as the drive train, brake system, or suspension components. For this reason, it may be necessary to inspect or
replace parts before the next scheduled service.
It is imperative that you adhere to the stipulated run-in times and service intervals. If you observe these exactly, you will ensure a
much longer service life for your motorcycle.
3.5 Figures
The figures contained in the manual may depict special equipment.
In the interest of clarity, some components may be shown disassembled or may not be shown at all. It is not always necessary to disassemble the component to perform the activity in question. Please follow the instructions in the text.
3.6 Customer service
Your authorized KTM dealer will be happy to answer any questions you may have on your vehicle and KTM.
A list of authorized KTM dealers can be found on the KTM website.
International KTM Website: http://www.ktm.com
4 VIEW OF VEHICLE 8
4.1 View of the vehicle from the left front (example)
1 Filler cap
2 Quick release of seat
3 Fuel tap ( p. 13)
4 Choke ( p. 14)
5 Plug-in stand ( p. 14)
6 Chain guide
601973-10
4 VIEW OF VEHICLE 9
4.2 View of the vehicle from the right rear (example)
1 Kill switch ( p. 12)
2 Throttle grip ( p. 12)
3 Hand brake lever ( p. 12)
4 Chassis number ( p. 10)
5 Shock absorber rebound adjustment
6 Level viewer for brake fluid, rear
7 Foot brake lever ( p. 14)
8 Kickstarter ( p. 14)
601972-10
5 SERIAL NUMBERS 10
5.1 Chassis number
The chassis number 1 is stamped on right of the steering head.
601576-10
5.2 Type label
(50 SX)
The type label 1 is located on the front frame tube.
5.3 Engine number
S00010-10
(50 SX Mini)
The type label 1 is located on the frame at the front right.
S00009-10
The engine number 1 is stamped on the left side of the engine under the engine
sprocket.
700461-01
5.4 Fork part number
The fork part number 1 is stamped on the outside of the axle clamp.
S00008-10
5 SERIAL NUMBERS 11
5.5 Shock absorber part number
The shock absorber part number 1 is stamped on the top of the shock absorber above
the adjusting ring towards the rear.
700469-01
6 CONTROLS 12
6.1 Hand brake lever
Hand brake lever 1 is fitted on the right side of the handlebar.
The hand brake lever is used to activate the front brake.
601578-10
6.2 Throttle grip
Throttle grip 1 is fitted on the right side of the handlebar.
601577-10
6.3 Kill switch
Kill switch 1 is fitted on the left side of the handlebar.
Possible states
• Kill switch in basic position – In this position, the ignition circuit is closed, and
the engine can be started.
• Kill switch pressed – In this position, the ignition circuit is interrupted, a running engine stops, and a non-running engine will not start.
601579-10
6.4 Opening filler cap
Danger
Fire hazard Fuel is highly flammable.
– Never refuel the vehicle near open flames or burning cigarettes, and always switch off the engine first. Be careful that no
fuel is spilt, especially on hot vehicle components. Clean up spilt fuel immediately.
– Fuel in the fuel tank expands when warm and can escape if the tank is overfilled. See the notes on refueling.
Warning
Danger of poisoning Fuel is poisonous and a health hazard.
– Avoid contact between fuel and skin, eyes and clothing. Do not inhale fuel vapors. If fuel gets into your eyes, rinse immedi-
ately with water and contact a doctor. Wash affected skin areas immediately with soap and water. If fuel is swallowed, contact a doctor immediately. Change clothing that has come into contact with fuel. Store fuel in a suitable canister according
to regulations and keep it out of the reach of children.
Warning
Environmental hazard Improper handling of fuel is a danger to the environment.
– Do not allow fuel to get into the ground water, the ground, or the sewage system.
6 CONTROLS 13
– Turn the tank cap 1 counterclockwise and pull it up.
601580-10
6.5 Closing filler cap
– Put the tank cap on and turn it clockwise.
Info
Run the fuel tank breather hose 1 without kinks.
601580-11
6.6 Opening oil tank cap (50 SX Mini)
– Turn the oil tank cap 1 counterclockwise and pull it up.
601582-10
6.7 Closing oil tank cap (50 SX Mini)
– Put the oil tank cap on and turn it clockwise.
601582-11
Info
Run the oil tank breather hose 1 without kinks.
6.8 Fuel tap
Fuel tap 1 is on the left of the fuel tank.
Possible states
• Fuel tap is closed – The knurled screw is turned all the way clockwise. Fuel cannot
flow out of the fuel tank.
• Fuel tap is open – The knurled screw is turned all the way counterclockwise. Fuel
can flow out of the fuel tank.
601581-10
6 CONTROLS 14
6.9 Choke (50 SX)
The choke knob 1 is fitted on the left of the carburetor.
Activating the choke function frees an opening through which the engine can draw
extra fuel. This results in a richer fuel-air mixture, which is needed for a cold start.
Info
If the engine is warm, the choke function must be deactivated.
Possible states
• Choke function activated – Choke knob is in upper position. The O-ring is visible.
601583-10
6.10 Choke (50 SX Mini)
700519-01
• Choke function deactivated – Choke knob is in lower position. No O-ring is visible.
The choke lever 1 is fitted on the right of the carburetor.
Activating the choke function frees an opening through which the engine can draw
extra fuel. This results in a richer fuel-air mixture, which is needed for a cold start.
Info
If the engine is warm, the choke function must be deactivated.
Possible states
• Choke function activated – The choke lever is pushed up all the way.
• Choke function deactivated – The choke lever is pushed down all the way.
6.11 Kickstarter
6.12 Foot brake lever
The kickstarter 1 is fitted on the right of the engine.
The kickstarter can be swiveled.
Info
Before riding, swing the kickstarter inwards towards the engine.
601584-10
Foot brake lever 1 is located in front of the right footrest.
The foot brake lever is used to activate the rear brake.
601587-10
6.13 Plug-in stand
The fixture for the plug-in stand 1 is located on the frame on the left side of the vehicle.
The plug-in stand is used to park the motorcycle.
Info
Remove the plug-in stand before riding.
601585-10
7 PREPARING FOR USE 15
7.1 Advice on first use
Warning
Danger of accidents Physical and mental readiness of a child.
– Your child must be able to ride a bicycle and must be able to erect the vehicle independently after a fall. In addition, your
child must understand the regulations and instructions from you or from other guardians. Do not ask too much of your
child; participation in competitive activities should not be considered until your child's stamina, riding techniques and
motivation are at the necessary levels. Children often underestimate or fail to recognize dangerous situations; make it clear
to your child that it should not, under any circumstances, operate the vehicle without supervision and that your child may
only drive at speeds that are commensurate with the child's riding abilities and the road conditions.
– Only let your child ride on the vehicle if it is physically and mentally ready to operate the vehicle.
Warning
Risk of injury Missing or poor protective clothing presents an increased safety risk.
– Wear protective clothing (helmet, boots, gloves, pants and jacket with protectors) every time you ride the vehicle. You and
your child should always used protective clothing that is in good condition and meets the legal requirements. When you
ride a motorcycle, set an example for your child and wear suitable protective clothing.
Warning
Danger of crashing Poor vehicle handling due to different tire tread patterns on front and rear wheels.
– The front and rear wheels must be fitted with tires with similar tread patterns to prevent loss of control over the vehicle.
Warning
Danger of accidents Critical riding behavior due to inappropriate riding.
– Ensure that your child adapts the riding speed to the road conditions and to his or her riding abilities.
Warning
Danger of accidents Accident risk caused by presence of a passenger.
– Your vehicle is not designed to carry passengers. Do not ride with a passenger.
Warning
Danger of accidents Brake system failure.
– If the foot brake lever is not released, the brake linings drag continuously. The rear brake may fail due to overheating.
Ensure that your child raises his or her foot from the foot brake lever when the child does not want to brake.
Warning
Danger of accidents Destruction of chassis components.
– Do not exceed the maximum allowable rider weight.
Warning
Risk of misappropriation Usage by unauthorized persons.
– Never leave the vehicle while the engine is running. Secure the vehicle against use by unauthorized persons.
Info
When using your motorcycle, remember that others may feel disturbed by excessive noise.
– Make sure that the pre-delivery inspection work has been carried out by an authorized KTM workshop.
You receive a delivery certificate and the service record at vehicle handover.
– Carefully read the entire owner's manual together with your child before going for the first ride.
Info
Pay special attention to the safety warnings and injury risks.
Explain to your child the techniques of riding and falling, e.g. how shifting weight can influence handling characteristics.
– Familiarize your child with the controls.
– Adjust the basic position of the hand brake lever. ( p. 45)
–
Adjust the basic position of the foot brake lever. x ( p. 50)
– Before using the vehicle for the first time, ensure that the basic settings of the chassis are suitable for the weight of your child.
– Accustom your child to the handling of the motorcycle on suitable terrain, preferably on a large open meadow.
7 PREPARING FOR USE 16
Info
To give your child a feel for the brake system, you should push your child at first. Do not start the engine until your child is
able to apply the necessary front brake pressure.
Initially, let your child drive to another person who can help your child stop and turn.
– Erect obstacles for your child to navigate around to accustom your child to handling the vehicle.
– Your child should also try to ride as slowly as possible and in a standing position to get a better feeling for the vehicle.
– Do not let your child ride on terrain that exceed your child's capabilities and experience.
– Your child should hold the handlebar firmly with both hands and keep his or her feet on the footrests when riding.
– Do not exceed the maximum allowable rider weight.
Guideline
Maximum rider weight < 35 kg (< 77 lb.)
Maximum rider size < 130 cm (< 51.2 in)
– Check the spoke tension. ( p. 57)
Info
The spoke tension must be checked after riding the motorcycle for half an hour.
– Run the engine in. ( p. 16)
7.2 Running in the engine
– During the running-in phase, do not exceed the specified engine performance.
Guideline
Maximum engine performance
During the first 3 operating hours < 70 %
During the first 5 operating hours < 100 %
– Avoid fully opening the throttle!
8 RIDING INSTRUCTIONS 17
8.1 Checks and maintenance measures when preparing for use
Info
Before each use, check the condition of the vehicle and its operating safety.
The vehicle must be in perfect technical condition when it is being operated.
– Check the gear oil level. ( p. 69)
(50 SX Mini)
– Check the oil level. ( p. 68)
– Check the front brake fluid level. ( p. 46)
– Check the rear brake fluid level. ( p. 51)
– Check the front brake linings. ( p. 48)
– Check the rear brake linings. ( p. 52)
– Check that the brake system is functioning properly.
– Check the coolant level. ( p. 60)
– Check the chain dirt accumulation. ( p. 38)
– Check the chain, rear sprocket, engine sprocket, and chain guide. ( p. 40)
– Check the chain tension. ( p. 39)
– Check the tire condition. ( p. 56)
– Check the tire air pressure. ( p. 57)
– Check the spoke tension. ( p. 57)
– Clean the dust boots of the fork legs. ( p. 27)
– Check the air filter.
– Check the settings of all controls and ensure that they can be operated smoothly.
– Check all screws, nuts and hose clamps regularly for tightness.
– Check the fuel supply.
8.2 Starting
Danger
Danger of poisoning Exhaust gases are toxic and inhaling them may result in unconsciousness and/or death.
– When running the engine, always make sure there is sufficient ventilation, and do not start or run the engine in an enclosed
space without an effective exhaust extraction system.
Note
Engine failure High engine speeds in cold engines have a negative effect on the service life of the engine.
– Always warm up the engine at low engine speeds.
Info
If the motorcycle is unwilling to start, the cause can be old fuel in the float chamber. The flammable elements of the fuel
evaporate after a long time of standing.
If the float chamber is filled with fresh fuel, the engine starts immediately.
Engine has been out of use for more than 1 week
–
Empty the carburetor float chamber. x ( p. 65)
– Turn the knurled screw on the fuel tap all the way counterclockwise.
Fuel can flow from the fuel tank to the carburetor.
The engine is cold
– Raise the motorcycle with a lift stand. ( p. 27)
Info
The rear wheel must not be in contact with the ground.
(50 SX)
– Pull the choke knob fully out and turn it by max. ¼ turn.
8 RIDING INSTRUCTIONS 18
(50 SX Mini)
– Push the choke lever up all the way.
– Forcefully step on the kick starter, pushing it all the way forward.
Info
Do not open the throttle.
8.3 Starting up
Info
The plug-in stand must be removed before beginning to ride.
– Open the throttle carefully.
8.4 Riding
Info
If you hear unusual noises while riding, stop immediately, switch off the engine, and contact an authorized KTM workshop.
– If the choke function was activated, deactivate it after the engine has warmed up.
– When you reach maximum speed after fully opening the throttle, turn back the throttle to about ¾ of its range. The speed hardly
drops, but the fuel consumption falls considerably.
– Your child should always open the throttle only as much as the engine can handle – abruptly opening the throttle increases fuel
consumption.
– Your child should switch off the engine if he or she expects to be standing for a long time.
Guideline
≥ 2 min
8.5 Braking
Warning
Danger of accidents If you brake too hard, the wheels can lock.
– Adapt your braking to the traffic situation and the road conditions.
Warning
Danger of accidents Reduced braking efficiency caused by spongy pressure point of front or rear brake.
– Check the brake system and do not continue riding. (Your authorized KTM workshop will be glad to help.)
Warning
Danger of accidents Reduced braking efficiency due to a wet or dirty brake system.
– Clean or dry a dirty or wet brake system by riding and braking gently.
– On sandy, wet or slippery surfaces, use the rear brake.
– Braking should always be completed before you go into a bend.
8.6 Stopping, parking
Warning
Risk of misappropriation Usage by unauthorized persons.
– Never leave the vehicle while the engine is running. Secure the vehicle against use by unauthorized persons.
Warning
Danger of burns Some vehicle components become very hot when the vehicle is operated.
– Do not touch hot components such as exhaust system, radiator, engine, shock absorber, and the brake system. Allow these
components to cool down before starting work on them.
Note
Danger of damage The parked vehicle may roll away or fall over.
8 RIDING INSTRUCTIONS 19
– Always place the vehicle on a firm and even surface.
Note
Fire hazard Some vehicle components become very hot when the vehicle is operated.
– Do not park the vehicle near flammable or explosive substances. Do not place objects on the vehicle while it is still warm from
being run. Always let the vehicle cool first.
Note
Material damage Damage and destruction of components due to excessive load.
– The plug-in stand is designed for the weight of the motorcycle only. You or your child should not sit on the motorcycle when it is
standing on the plug-in stand. The plug-in stand and/or the frame could be damaged and the motorcycle could fall over.
– Brake the motorcycle.
– Press and hold the kill switch while the engine is idling until the engine stops.
– Turn the knurled screw on the fuel tap all the way clockwise.
– Park the motorcycle on firm ground.
8.7 Transport
Note
Danger of damage The parked vehicle may roll away or fall over.
– Always place the vehicle on a firm and even surface.
Note
Fire hazard Some vehicle components become very hot when the vehicle is operated.
– Do not park the vehicle near flammable or explosive substances. Do not place objects on the vehicle while it is still warm from
being run. Always let the vehicle cool first.
– Switch off the engine.
– Use tension belts or other suitable devices to secure the motorcycle against acci-
dents or falling over.
401475-01
8.8 Refueling
Danger
Fire hazard Fuel is highly flammable.
– Never refuel the vehicle near open flames or burning cigarettes, and always switch off the engine first. Be careful that no
fuel is spilt, especially on hot vehicle components. Clean up spilt fuel immediately.
– Fuel in the fuel tank expands when warm and can escape if the tank is overfilled. See the notes on refueling.
Warning
Danger of poisoning Fuel is poisonous and a health hazard.
– Avoid contact of the fuel with skin, eyes and clothing. Do not inhale fuel vapors. If fuel gets into your eyes, rinse imme-
diately with water and contact a doctor. Wash affected skin areas immediately with soap and water. If fuel is swallowed,
contact a doctor immediately. Change clothing that has come into contact with fuel.
Warning
Environmental hazard Improper handling of fuel is a danger to the environment.
– Do not allow fuel to get into the ground water, the ground, or the sewage system.
– Switch off the engine.
– Open the filler cap. ( p. 12)
8 RIDING INSTRUCTIONS 20
00
0
AA
– Fill the fuel tank with fuel up to measurement A.
Guideline
Measurement of A 35 mm (1.38 in)
400214-10
Fuel tank
capacity, approx.
(50 SX Mini)
Fuel tank
capacity, approx.
(50 SX)
– Close the filler cap. ( p. 13)
2.0 l (2.1 qt.) Super unleaded (ROZ 95/RON 95/PON
2.3 l (2.4 qt.) Super unleaded gasoline, mixed with
8.9 Filling up with oil (50 SX Mini)
Warning
Engine failure If the vehicle is run without 2-stroke oil in the tank, the result is engine failure.
– The oil tank must always be filled up to the MIN mark.
– Switch off the engine.
– Open the oil tank cap. ( p. 13)
– Fill the oil tank at least up to the MIN mark A.
Guideline
MIN mark Sufficient for a single tank filling
Oil tank contents
ca.
– Close the oil tank cap. ( p. 13)
0.2 l (0.2 qt.) 2-stroke engine oil ( p. 81)
91) ( p. 82)
2-stroke engine oil (1:60) ( p. 82)
601586-10
9 SERVICE SCHEDULE 21
9.1 Service schedule
S10N S20A S40A S80A J1A
Check the front brake linings. ( p. 48) • • • •
Check the rear brake linings. ( p. 52) • • • •
Check the brake discs. ( p. 46) • • • •
Check brake lines for damage and leakage. • • • •
Change the sealing sleeves of the foot brake cylinder. x
Change the rear brake fluid. x
Check the rear brake fluid level. ( p. 51) • • • •
Check the free travel of the foot brake lever. ( p. 50) • • • •
Check the frame and swingarm. x
Check swingarm bearing. x
Check the heim joints on the upper and lower shock absorbers. x
Service the fork. x
Service the shock absorber. x
Check the tire condition. ( p. 56) • • • •
Check the tire air pressure. ( p. 57) • • • •
Check wheel bearing for play. x
Check the wheel hubs. x
Check rim run-out. x
Check the spoke tension. ( p. 57) • • • •
Check the chain, rear sprocket, engine sprocket, and chain guide. ( p. 40) • • • •
Check the chain tension. ( p. 39) • • • •
Lubricate all moving parts (e. g. hand levers, chain, ...) and check for smooth opera-
tion. x
Change the front brake fluid. x
Check the front brake fluid level. ( p. 46) • • • •
Check the play of the handbrake lever. ( p. 45) • • • •
Grease the steering head bearing. x ( p. 32)
Check play of steering head bearing. ( p. 31) • • • •
Check the clutch. x
Change the piston. x
Change the connecting rod, conrod bearing and crank pin. x
Change the crankshaft bearing. x
Check the transmission. x
Change all engine bearings. x
Change the gear oil. x ( p. 69)
Check the gear oil level. ( p. 69) • • •
Change the spark plug. x
Change the spark plug connector. x
Check the cylinder and piston. x
Check the intake membrane. x
Check all hoses (e. g. fuel, cooling, bleeding, drainage) and sleeves for tearing, tight-
ness and correct routing. x
Check the antifreeze and coolant level. ( p. 59) • • • •
Check the cables for damage and routing without sharp bends. x
Check the cables for damage, routing without sharp bends and correct adjustment. • • • •
Clean the air filter and air filter box. x ( p. 36)
Change the glass fiber yarn filling of the main silencer. x ( p. 37)
Check the screws and nuts for tightness. x
• • • •
• • • •
• • •
• • • •
• • • •
• • • •
• • • •
• • •
•
• • •
• • •
• • •
• •
•
• • •
• • •
•
•
• •
• •
• •
• •
• •
•
• • •
• •
• • •
• • •
• • •
9 SERVICE SCHEDULE 22
S10N S20A S40A S80A J1A
Check/set the carburetor components. x
Check idle. x
Check the clutch setting. x ( p. 65)
Final inspection: check the vehicle for operating safety and take a test ride. • • • •
Create a service entry in the KTM DEALER.NET and in the service record. x
S10N: Once after 10 operating hours
S20A: Every 20 operating hours
S40A: Every 40 operating hours
S80A: Every 80 operating hours
J1A: Annually
• • • •
• • •
• • • •
•
10 TUNING THE CHASSIS 23
00A
00A
0
BB
10.1 Adjusting the rebound damping of the shock absorber
Caution
Danger of accidents Disassembly of pressurized parts can lead to injury.
– The shock absorber is filled with high density nitrogen. Adhere to the description provided. (Your authorized KTM workshop
will be glad to help.)
– Turn adjusting screw 1 clockwise up to the last perceptible click.
– Turn back counterclockwise by the number of clicks corresponding to the shock
absorber type.
Guideline
Rebound damping (50 SX)
Standard 10 clicks
Rebound damping (50 SX Mini)
601591-10
Standard 12 clicks
Info
Turn clockwise to increase damping; turn counterclockwise to reduce damping.
10.2 Measuring rear wheel sag unloaded
Preparatory work
– Raise the motorcycle with a lift stand. ( p. 27)
Main work
– Measure the distance – as vertical as possible – between the rear axle and a fixed
point, for example, a mark on the side cover.
– Make a note of the value as measurement A.
400988-10
Finishing work
– Remove the motorcycle from the lift stand. ( p. 27)
10.3 Checking the static sag of the shock absorber
– Measure distance A of rear wheel unloaded. ( p. 23)
– Hold the motorcycle in a vertical position with the assistance of another person.
– Measure the distance between the rear axle and the fixed point again.
– Make a note of the value as measurement B.
Info
The static sag is the difference between measurements A and B.
400989-10
– Check the static sag.
Static sag (50 SX) 20 mm (0.79 in)
Static sag (50 SX Mini) 15 mm (0.59 in)
» If the static sag is less or more than the specified value:
–
Adjust the spring preload of the shock absorber. x ( p. 24)
10 TUNING THE CHASSIS 24
00AA
0
0
CC
10.4 Checking the riding sag of the shock absorber
– Measure distance A of rear wheel unloaded. ( p. 23)
– With another person holding the motorcycle, the rider sits down on the saddle in
full protective clothing in a normal sitting position (feet on footrests) and bounces
up and down a few times.
The rear wheel suspension levels out.
– Another person now measures the distance between the rear axle and a fixed point.
– Make a note of the value as measurement C.
Info
The riding sag is the difference between measurements A and C.
– Check the riding sag.
Riding sag (50 SX) 45… 55 mm (1.77… 2.17 in)
Riding sag (50 SX Mini) 40… 50 mm (1.57… 1.97 in)
» If the riding sag differs from the specified measurement:
–
Adjust the riding sag. x ( p. 25)
400990-10
10.5 Adjusting the spring preload of the shock absorber x
Caution
Danger of accidents Disassembly of pressurized parts can lead to injury.
– The shock absorber is filled with high density nitrogen. Adhere to the description provided. (Your authorized KTM workshop
will be glad to help.)
Preparatory work
– Raise the motorcycle with a lift stand. ( p. 27)
–
Remove shock absorber. x ( p. 34)
– After removing the shock absorber, clean it thoroughly.
Main work
– Measure the full spring length while it is under tension and note down the value.
– Loosen retaining ring 1.
– Turn adjusting ring 2 until the spring is no longer under tension.
Hook wrench (T106S)
– Measure the overall spring length when not under tension.
– Tighten the spring by turning adjusting ring 2 to the specified measurement.
700506-01
Guideline
Spring preload (50 SX)
Standard 3 mm (0.12 in)
Spring preload (50 SX Mini)
Standard 5 mm (0.2 in)
Info
The spring preload is the difference between the relaxed spring length and
the tensioned spring length.
Depending on the static sag and/or the riding sag, it may be necessary to
increase or decrease the spring preload.
– Tighten retaining ring 1.
Finishing work
–
Install shock absorber. x ( p. 34)
– Remove the motorcycle from the lift stand. ( p. 27)
10 TUNING THE CHASSIS 25
000B
0
A
10.6 Adjusting the riding sag x
Preparatory work
– Raise the motorcycle with a lift stand. ( p. 27)
–
Remove shock absorber. x ( p. 34)
– After removing the shock absorber, clean it thoroughly.
Main work
– Choose and mount a suitable spring.
Guideline
Spring rate (50 SX)
B00292-10
Weight of rider: 15… 25 kg (33…
55 lb.)
Weight of rider (standard): 25…
35 kg (55… 77 lb.)
Weight of rider: 35… 45 kg (77…
99 lb.)
Spring rate (50 SX Mini)
Weight of rider: 15… 25 kg (33…
55 lb.)
Weight of rider (standard): 25…
35 kg (55… 77 lb.)
Weight of rider: 35… 45 kg (77…
99 lb.)
30 N/mm (171 lb/in)
35 N/mm (200 lb/in)
40 N/mm (228 lb/in)
65 N/mm (371 lb/in)
75 N/mm (428 lb/in)
85 N/mm (485 lb/in)
10.7 Handlebar position
400565-10
Info
The spring rate is shown on the outside of the spring.
Smaller weight differences can be compensated by changing the spring
preload.
Finishing work
–
Install shock absorber. x ( p. 34)
– Remove the motorcycle from the lift stand. ( p. 27)
– Check the static sag of the shock absorber. ( p. 23)
– Check the riding sag of the shock absorber. ( p. 24)
– Adjust the rebound damping of the shock absorber. ( p. 23)
On the upper triple clamp, there are 2 holes at a distance of A to each other.
Distance A between holes 15 mm (0.59 in)
The holes on the handlebar support are placed at a distance of B from the center.
Distance B between holes 3.5 mm (0.138 in)
The handlebar supports can be mounted in 4 different positions.
10.8 Adjusting handlebar position x
Warning
Danger of accidents Handlebar breakage.
– If the handlebar is bent or straightened it will cause material fatigue, and the handlebar can break. Always replace handle-
bar.
10 TUNING THE CHASSIS 26
0011
0
0
22
– Remove the four screws 1. Remove the handlebar clamps. Remove the handlebar
and lay it to one side.
Info
Protect the motorcycle and its attachments from damage by covering them.
Do not bend the cables and lines.
– Remove the two screws 2. Remove the handlebar support.
– Place the handlebar support in the required position. Mount and tighten the two
400564-10
screws 2.
Guideline
Screw, handlebar support M10 40 Nm
(29.5 lbf ft)
– Position the handlebar.
Info
Make sure cables and wiring are positioned correctly.
– Position the handlebar clamps. Mount and evenly tighten the four screws 1.
Guideline
Screw, handlebar clamp M8 20 Nm
Loctite®243™
(14.8 lbf ft)
Info
Make sure the gap width is even.
10.9 Adjusting seat height x
Warning
Danger of accidents Modifications to the suspension settings can seriously alter the vehicle's ride behavior.
– Following modifications, ride slowly at first to get the feel of the new ride behavior.
Preparatory work
– Raise the motorcycle with a lift stand. ( p. 27)
Main work
– Hold the rear wheel with the swingarm and remove screw 1.
– Position the shock absorber according to the required seat height.
Guideline
Low seat position (standard) A
High seat position B
– Mount and tighten screw 1.
601589-10
Guideline
Screw, top shock absorber M10 45 Nm
Finishing work
– Remove the motorcycle from the lift stand. ( p. 27)
(33.2 lbf ft)
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