KTM 125 SX EU 2015 - Checking the Basic Setting of the Fork

10 TUNING THE CHASSIS 35
B00292-10
Main work
– Choose and mount a suitable spring.
Guideline
Spring rate (125/150 SX)
Weight of rider: 65… 75 kg (143…
165 lb.)
45 N/mm (257 lb/in)
Weight of rider: 75… 85 kg (165…
187 lb.)
48 N/mm (274 lb/in)
Weight of rider: 85… 95 kg (187…
209 lb.)
51 N/mm (291 lb/in)
Spring rate (250 SX EU)
Weight of rider: 65… 75 kg (143…
165 lb.)
51 N/mm (291 lb/in)
Weight of rider: 75… 85 kg (165…
187 lb.)
54 N/mm (308 lb/in)
Weight of rider: 85… 95 kg (187…
209 lb.)
57 N/mm (325 lb/in)
Spring rate (250 SX US)
Weight of rider: 65… 75 kg (143…
165 lb.)
51 N/mm (291 lb/in)
Weight of rider: 75… 85 kg (165…
187 lb.)
54 N/mm (308 lb/in)
Weight of rider: 85… 95 kg (187…
209 lb.)
57 N/mm (325 lb/in)
Spring rate (All XC models)
Weight of rider: 65… 75 kg (143…
165 lb.)
51 N/mm (291 lb/in)
Weight of rider: 75… 85 kg (165…
187 lb.)
54 N/mm (308 lb/in)
Weight of rider: 85… 95 kg (187…
209 lb.)
57 N/mm (325 lb/in)
Info
The spring rate is shown on the outside of the spring.
Finishing work
–
Install the shock absorber. x ( p. 47)
– Install the main silencer. ( p. 51)
– Remove the motorcycle from the lift stand. ( p. 39)
– Check the static sag of the shock absorber. ( p. 33)
– Check the riding sag of the shock absorber. ( p. 33)
– Adjust the rebound damping of the shock absorber. ( p. 32)
10.11 Checking the basic setting of the fork
Info
For various reasons, no exact riding sag can be determined for the forks.
401000-01
– As with the shock absorber, smaller differences in the rider's weight can be com-
pensated by the spring preload.
– However, if the fork is often overloaded (hard end stop on compression), harder
springs must be fit to avoid damage to the fork and frame.