Checking The Brake Discs; Checking The Spoke Tension - KTM 250 EXC EU Repair Manual

14 WHEELS
14.3

Checking the brake discs

Warning
Danger of accidents Reduced braking efficiency due to worn brake disc(s).
–
Change the worn brake disc(s) without delay.
14.4

Checking the spoke tension

Warning
Danger of accidents Instable handling due to incorrect spoke tension.
–
Ensure that the spoke tension is correct.
Info
A loose spoke causes wheel imbalance and rapidly leads to more loose spokes.
If the spokes are too tight, they can break due to local overload.
Check the spoke tension regularly, especially on a new motorcycle.
–
Check the thickness of the front and rear brake discs at several places on the disc
to see if it conforms to measurement
Info
Wear reduces the thickness of the brake disc around the area used by the
brake linings.
Brake discs - wear limit
Front
400257-10
Rear
» If the brake disc thickness is less than the specified value:
–
Change the brake disc.
–
Check the front and rear brake discs for damage, cracking and deformation.
» If the brake disc exhibits damage, cracking or deformation:
–
Change the brake disc.
–
Briefly strike each spoke with the tip of a screwdriver.
Info
The tone frequency depends on the length of the spoke and the spoke diam-
eter.
If you hear different tone frequencies from different spokes of equal length
and diameter, this is an indication of different spoke tensions.
You should hear a high note.
400694-01 » If the spoke tension varies:
–
Correct the spoke tension.
–
Check the spoke torque.
Guideline
Spoke nipple, front wheel
Spoke nipple, rear wheel
Torque wrench with various accessories in set (58429094000) (
.
A
2.5 mm (0.098 in)
3.5 mm (0.138 in)
M4.5 5... 6 Nm (3.7...
4.4 lbf ft)
M4.5 5... 6 Nm (3.7...
4.4 lbf ft)
92
p. 275)