10 TUNING THE CHASSIS 28
10.9 Checking the riding sag of the shock absorber
400990-10
–
Measure distance
of rear wheel unloaded. ( p. 27)
– With another person holding the motorcycle, the rider, wearing full protective cloth-
ing, sits on the seat in a normal sitting position (feet on footrests) and bounces up
and down a few times.
The rear wheel suspension levels out.
– Another person now measures the distance between the rear axle and the fixed
point.
–
Note down the value as dimension
.
Info
The riding sag is the difference between measurements
and
.
– Check the riding sag.
Riding sag (50 SX) 80 mm (3.15 in)
Riding sag (50 SX Mini) 65 mm (2.56 in)
» If the riding sag differs from the specified measurement:
– Adjust the riding sag. ( p. 29)
10.10 Adjusting the spring preload of the shock absorber
Caution
Risk of injury Parts of the shock absorber will fly off if the shock absorber is disassembled incorrectly.
The shock absorber is filled with highly compressed nitrogen.
– Please follow the description provided. (Your authorized KTM workshop will be glad to help.)
Preparatory work
(50 SX)
– Raise the motorcycle with a lift stand. ( p. 34)
(50 SX Mini)
– Raise the motorcycle with a lift stand. ( p. 34)
– Remove the rear wheel. ( p. 68)
– Remove the shock absorber. ( p. 45)
– After removing the shock absorber, clean it thoroughly.
V00261-10
Main work
(50 SX)
– Measure the full spring length while it is under tension and note down the
value.
–
Loosen retaining ring
.
–
Turn adjusting ring
until the spring is no longer under tension.
Hook wrench (T106S)
– Measure the overall spring length while the spring is not under tension.
–
Tighten the spring by turning adjusting ring
to the specified measurement.
Guideline
Spring preload
Standard 3 mm (0.12 in)
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.
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