KTM may stop manufactur- ing certain 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 models partly contain extra equipment, which is not applied to standard models.
Please strictly observe the prescribed running-in periods and inspection and maintenance intervals. Compliance with these instructions will significantly prolong the life of your motorcycle. Be sure to have the maintenance work carried out by a KTM workshop to avoid losing your right to claim under the warranty.
IMPORTANT WARRANTY AND GUARANTEE INFORMATION KTM mini-sports motorcycles are designed and constructed to resist the usual wear and tear of normal use in competitions. The motorcycles comply with the regulations and categories currently in effect with the leading interna- tional motorcycle associations.
IMPORTANT INFORMATION FOR PARENTS ABOUT SAFE DRIVING KTM mini motorcycles are off-road motorcycles designed for one person only. They are not allowed on public roads. The vehicle dimensions and components are designed for children from 4 to 10 years of age with a maximum weight of.
» SERIAL NUMBER LOCATIONS Chassis number The chassis 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 kickstarter.
» OPERATION INSTRUMENTS 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 the right side of the handlebars and actuates the front wheel brake.
» OPERATION INSTRUMENTS Choke (Dell’Orto carburetor PHVA 14 DS) Choke lever  is mounted to the right side of the carburetor. If you move the choke lever up to the stop, a hole is opened in the carburetor through which the engine can draw in additional fuel.
OPERATION INSTRUMENTS » Plugin - Stand (50 SX, 50 Supermoto) A socket is provided on the left side of the frame for the plug-in stand  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 of the setting wheel .
– ONLY USE ACCESSORY PARTS RECOMMENDED BY KTM. – NEVER LEAVE YOUR MOTORCYCLE WITHOUT SUPERVISION AS LONG AS THE ENGINE IS RUNNING. – KTM MINI MODELS ARE DESIGNED FOR ONE PERSON ONLY. PASSENGERS ARE NOT ALLOWED. – THESE MODELS DO NOT COMPLY WITH THE REGULATIONS AND SAFETY STANDARDS ESTABLISHED BY THE LAW.
If the brake fluid falls below the minimum level, the brake system is either leaking or the brake shoes are completely worn out. Have the brake system checked at a KTM workshop to avoid brake failure. Also have the condition of the brake hose and the brake lining thickness checked.
DRIVING INSTRUCTIONS » Starting when the engine is cold 1 Open fuel tap . 2 Operate the choke . 3 Kick the side up all the way or remove the plug-in stand. 4 Apply the front brake. 5 Operate the kickstarter, depressing it all the way, without opening the throttle. –...
FORE BE SURE TO BRAKE THEM DRY AFTER CLEANING. – IF THE RESISTANCE OF THE HAND BRAKE LEVER FEELS UNRE- SPONSIVE, SOMETHING IS WRONG WITH THE BRAKE SYSTEM. HAVE THE BRAKE SYSTEM CHECKED AT A KTM WORKSHOP BEFORE YOU LET YOUR CHILD DRIVE THE MOTORCYCLE. Stopping Reduce the speed.
MAINTENANCE WORK PERFORMED BY YOUR AUTHORIZED KTM WORKSHOP IS NOT A SUBSTITUTE FOR CARE AND MAINTE- NANCE BY THE DRIVER! NOTE: A service hour counter (item no.: SXS05450600) is available from your KTM dealer for strict observance of the service intervals.
50 SX JUNIOR 50 SX 50 SUPERMOTO RECOMMENDED INSPECTION OF THE MINI LC ENGINE BY YOUR KTM WORKSHOP (ADDITIONAL ORDER FOR THE KTM WORKSHOP) Check the reed-type intake valve for wear Check the clutch shoes for wear Check the clutch engagement speed...
MAINTENANCE WORK AND ADJUSTMENTS MARKED WITH AN ASTERISK (*) MUST BE PERFORMED BY AN EXPERT. TO PRO- TECT YOUR YOUNGSTER, ALWAYS HAVE SUCH WORK PERFORMED BY A SPECIALIZED KTM DEALER WHERE YOUR MOTORCY- CLE WILL BE OPTIMALLY SERVICED BY APPROPRIATELY QUALIFIED, SKILLED STAFF.
MAINTENANCE WORK ON CHASSIS AND ENGINE 3,5 mm Checking and adjusting the steering head bearing (50 SX, 50 Supermoto) * The steering head bearing should be checked regularly for play. To check, support the motorcycle frame and lift the front wheel off the ground. Now try to move the fork back and forth –...
MAINTENANCE WORK ON CHASSIS AND ENGINE 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  from the brake caliper and unscrew holding clamp.
 and re-tighten the locking ring . BASIC SETTING – SPRING PRELOAD: 50 SX Junior: ...10 mm (0.39 in) 50 SX, 50 Supermoto: ... 7 mm (0.3 in) Check chain tension Put the motorcycle on the sidestand.
In this case, consult an authorized KTM dealer immediately. BRAKE FLUID: KTM fills the brake system with ”Motorex Brake Fluid DOT 5.1”, one of the best brake fluids currently available. We recommend 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.
MAINTENANCE WORK ON CHASSIS AND ENGINE min. 1 mm Checking the brake fluid level/ refilling * The brake fluid reservoir is combined with the hand brake cylinder on the handlebar. To check the brake fluid level, press the brake pistons back into the basic position.
Brake drum and brake linings can be slightly roughened with an abrasive tape. Changing the basic position of the foot brake lever (50 SX, 50 Supermoto) The basic setting of the foot brake pedal can be changed by turning the end stop roller .
1 mm Refilling the rear brake fluid reservoir * (50 SX, 50 Supermoto) Remove the screws  and take off the cover  and diaphragm .The brake pistons must be pushed back to their basic position. Fill DOT 5.1 brake fluid (e.g.
– 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 POSSIBLE. A LOOSE AXLE MAY LEAD TO AN UNSTABLE DRIVING BEHAVIOR OF YOUR MOTORCYCLE.
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.
Mount the silencer and check the exhaust system for tightness. Note: Glass fiber yarn packages are offered by your licensed KTM dealer. THE EXHAUST SYSTEM BECOMES VERY HOT WHILE THE MOTORCYCLE IS RUNNING. TO AVOID BURNS DO NOT START WORK ON THE EXHAUST SYSTEM UNTIL IT HAS PROPERLY COOLED DOWN.
MAINTENANCE WORK ON CHASSIS AND ENGINE Changing the seat height The saddle can easily be raised by 25 mm (1 in). This lets you adjust the height as your child grows. Figures A and B show the fork and shock absorber positions for a low seat position.
» MAINTENANCE WORK ON CHASSIS AND ENGINE Checking the gear oil level To check the gear oil level, first remove the plug . With the motorcycle parked in an upright position, a small quantity of oil should flow out of the indicator opening .
In both cases, the engine will not seem to have enough power. Check the clutch engagement speed every 20 hours and correct if necessary or have it corrected by an authorized KTM workshop. To tune your clutch, lay the bike on the left side. To prevent oil from leaking from the transmission vent hose, run the hose upwards and fasten.
» TROUBLE SHOOTING CORRECTING CLUTCH WEAR: Check the clutch shoes for wear. If the surface is only slightly worn you can remount them again. NOTE: The centrifugal clutch has an outer diameter of approx. 82.5 mm when new. To correct slight wear to the surface, you can insert one of the pretensioning disks  from each clutch spring between the clutch hub and the clutch shoes –...
TECHNICAL DATA – ENGINE TROUBLE CAUSE Engine stalling or running Carburetor overflows if level adjust too high, float with four stroke cycle needle seating is dirty or enlarged Loose carburetor jets High rpm misfiring Incorrect heat range spark plug or low quality spark plug Loose, corroded or non conductive ignition socket connector...
» CLEANING Clean your motorcycle regularly in order to keep its painted finish looking shiny and new. The best manner would be to use warm water that has been mixed with a commercially available washing detergent and a sponge. The hard dirt can be removed before with the help of a soft water jet.