10 TUNING THE CHASSIS 32
10.9 Checking the riding sag of the shock absorber
402417-10
–
Measure dimension
A
of rear wheel unloaded. ( p. 30)
– 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 again measures the distance between the rear axle and
marking SAG on the rear fender using the sag gauge.
–
Note down the value as dimension
C
.
Info
The riding sag is the difference between measurements
A
and
C
.
– Check the riding sag.
Guideline
Riding sag (125/150 SX EU) 105 mm (4.13 in)
Riding sag (125/150 SX US) 105 mm (4.13 in)
» If the riding sag differs from the specified measurement:
– Adjust the riding sag. ( p. 33)
10.10 Adjusting the spring pretension 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.)
Info
Before changing the spring pretension, make a note of the present setting, e.g., by measuring the length of the spring.
Preparatory work
– Raise the motorcycle with a lift stand. ( p. 38)
– Remove the shock absorber. ( p. 45)
– After removing the shock absorber, clean it thoroughly.
402659-10
Main work
–
Loosen screw
1
.
–
Turn adjusting ring
2
until the spring is no longer under tension.
Hook wrench (90129051000)
– Measure the overall spring length while the spring is not under tension.
–
Tighten the spring by turning adjusting ring
2
to measurement
A
.
Guideline
Spring preload (125/150 SX EU) 6 mm (0.24 in)
Spring preload (125/150 SX US) 6 mm (0.24 in)
Info
Depending on the static sag and/or the riding sag, it may be necessary to
increase or decrease the spring pretension.
–
Tighten screw
1
.
Guideline
Screw, shock absorber adjusting ring M5 5 Nm (3.7 lbf ft)
Finishing work
– Install the shock absorber. ( p. 46)
– Remove the motorcycle from the lift stand. ( p. 38)
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