ENGLISH
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MAINTENANCE WORK ON CHASSIS AND ENGINE »
Removing the seat
The quick-release mechanism [1] allows removal of the seat without tools.
Turn the quick-release device approximately 180° counterclockwise, lift the
rear portion of the seat and pull the seat off backwards.
When mounting the seat ensure that the hook engages at the tank.
Checking and adjusting the steering head bearing (50 SX Junior) *
The steering head bearing should be checked regularly for play. For this
purpose, jack up the motorcycle by the frame so that the front wheel is in the
air. Now try to move the fork forward and backward. There should be no clear-
ance. For readjustment, release the two clamp screws [2] of the top triple
clamp and the counternut [3]. Turn the adjusting nut [4] until almost no play
is left. Do not tighten the adjusting nut! Tightening the adjusting nut can
damage the bearings! Keep in mind that tightening the
counternut [3] reduces the play of the bearing. Slightly tap the top triple clamp
with a rubber hammer to prevent jamming. Then tighten the 2 clamp screws
with 20 Nm.
IF THE STEERING HEAD BEARING IS NOT ADJUSTED TO BE FREE OF CLEARANCE,
THE MOTORCYCLE WILL EXHIBIT UNSTEADY DRIVING CHARACTERISTICS AND
CAN GET OUT OF CONTROL.
– THE HANDLEBAR MUST MOVE 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 least once a year, the steering head bearings should be smeared with water-
proof grease (Motorex Long Term 2000).
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.
– WHEN CLEANING THE MOTORCYCLE, DO NOT USE A HIGH PRESSURE CLEANING UNIT IF POSSIBLE, OTHERWISE WATER
WILL PENETRATE THE BEARINGS, CARBURETOR, ELECTRIC CONNECTORS, DRUM BRAKES, ETC.
– BEFORE CLEANING WITH WATER, PLUG THE EXHAUST PIPE TO PREVENT WATER INGRESS
– WHEN TRANSPORTING YOUR MOTORCYCLE, SECURE IT WITH ELASTIC STRAPS OR OTHER MECHAICAL DEVICES IN AN UPRIGHT
POSITION. BE SURE THAT THE FUEL TAP IS CLOSED. IF THE MOTORCYCLE TOPPLES OVER, FUEL CAN FLOW OUT OF THE
CARBURETOR OR FUEL TANK.
– DO NOT USE TOOTHED WASHERS OR SPRING RINGS WITH THE ENGINE FASTENING SCREWS, AS THESE WORK INTO THE
FRAME PARTS AND KEEP WORKING LOOSE. INSTEAD, USE SELF-LOCKING NUTS.
– LET YOUR MOTORCYCLE COOL DOWN BEFORE BEGINNING ANY MAINTENANCE WORK IN ORDER TO AVOID GETTING BURNED.
– DISPOSE OF OILS, FATTY MATTERS, FILTERS, FUELS, WASHING DETERGENTS, ETC. PROPERLY.
– UNDER NO CIRCUMSTANCES MAY USED OIL BE DISPOSED OF IN THE SEWAGE SYSTEM OR IN THE OPEN COUNTRYSIDE.
1 LITER OF USED OIL CONTAMINATES 1,000,000 LITERS OF WATER.
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