KTM 50 SX Motorcycle User Manual


 
ENGLISH
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MAINTENANCE WORK ON CHASSIS AND ENGINE
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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 ham-
mer to prevent jamming. Then tighten the 2 clamp screws with 25 Nm.
If the steering head bearing is not adjusted to be free of clearance, the motor-
cycle 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 protect your youngster, always have
such work performed by a specialized KTM dealer where your motorcycle 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 mechanical 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 contam-
inates 1,000,000 liters of water.
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