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10
TUNING THE CHASSIS
10.4
Checking the riding sag of the shock absorber
10.5
Adjusting the spring preload 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.)
–
Measure distance
–
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
A
0 0 A
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
Info
The riding sag is the difference between measurements
–
Check the riding sag.
Riding sag (50 SX)
0 0 C
C
Riding sag (50 SX Mini)
»
If the riding sag differs from the specified measurement:
–
Adjust the riding sag.
400990-10
Preparatory work
–
Raise the motorcycle with a lift stand. (
–
Remove shock absorber.
–
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
–
Turn adjusting ring
Hook wrench (T106S)
–
Measure the overall spring length when not under tension.
–
Tighten the spring by turning adjusting ring
Guideline
700506-01
Spring preload (50 SX)
Standard
Spring preload (50 SX Mini)
Standard
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
Finishing work
–
Install shock absorber.
–
Remove the motorcycle from the lift stand. (
of rear wheel unloaded. (
A
.
C
45... 55 mm (1.77... 2.17 in)
40... 50 mm (1.57... 1.97 in)
(
p. 25)
x
x
p. 27)
(
p. 34)
x
.
1
until the spring is no longer under tension.
2
2
3 mm (0.12 in)
5 mm (0.2 in)
.
1
x
(
p. 34)
p. 23)
and
.
A
C
to the specified measurement.
p. 27)
24
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