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MAINTENANCE WORK ON CHASSIS AND ENGINE
18
C
1
D
Basic suspension setup for the weight of the driver
(50 Mini SX)
To achieve maximum handling performance and to prevent the telescopic fork
and shock absorber from being damaged, the basic setup of the suspension
components must be suitable for your child's weight. At delivery, KTM's mini
A
motorcycles are set to accommodate a driver weighing 25 - 30 kg (wearing
full protective clothing). If your child's weight exceeds or falls short of this
range, you will need to adjust the spring preload for the telescopic fork and
shock absorber accordingly.
To adjust, check the sag of the shock absorber and telescopic fork. The motor-
cycle should be filled up and your child should be wearing full protective
clothing.
To determine the sag of the shock absorber
– Jack up the motorcycle until the rear wheel no longer touches the ground.
– Measure the vertical distance between the rear wheel axle and a fixed point
– Place the motorcycle on the ground again.
– Have your child sit on the motorcycle in a normal seating position (feet
– Holding your child and the bike, have another person measure the dis-
B
B
– The sag is the difference between dimensions A and B.
EXAMPLE:
Motorcycle jacked up (dimension A) . . . . . . . . . . . . . . . . . . . . . .330 mm
Motorcycle on ground with driver seated (dimension B) . . . . . . .– 285 mm
Sag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 mm
50 Mini SX shock absorber sag . . . . . . . . . . . . . . . . . . 50 mm (± 5 mm)
If the sag is lower, the spring preload of the shock absorber must be reduced,
if the sag is higher, the spring preload must be increased (see Changing spring
preloading of the shock absorber).
To determine the sag of the telescopic fork
– Jack up the motorcycle until the rear wheel no longer touches the ground.
– Measure the distance between the upper edge of the slider tube and the
– Have your child sit on the motorcycle in a normal seating position (feet
– Holding your child and the bike, have another person measure the dis-
– The sag is the difference between dimensions C and D.
EXAMPLE:
Motorcycle jacked up (dimension C) . . . . . . . . . . . . . . . . . . . . . .200 mm
Motorcycle on ground with driver seated (dimension D) . . . . . . .– 160 mm
Sag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 mm
50 Mini SX telescopic fork sag . . . . . . . . . . . . . . . . . . . 40 mm (± 5 mm)
If the sag is lower, the spring preload of the telescopic fork must be reduced,
if the sag is higher, the spring preload must be increased.
The preload on the fork spring is determined by the length of preload spacer
[1]. If an adjustment is necessary, demount the fork legs, remove the plugs
and shorten the pretensioning sleeves or replace with longer ones (see
Maintenance of telescopic fork). Harder fork springs are also available for both
models (see spare parts catalog).
(e.g. a mark on the side cover) and write it down as dimension A.
on the footrests) wearing full protective clothing and bounce up and down
a few times to allow the rear wheel suspension to become level.
tance between the same two points with the load on the motorcycle to
establish dimension B.
triple clamp and write it down as dimension C.
on the footrests) wearing full protective clothing, and bounce up and down
a few times to allow the telescopic fork to become level.
tance between the same two points with the load on the motorcycle to
establish dimension D.
»
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