Yamaha WR250F(N) Owner's Service Manual page 474

FRONT WHEEL AND REAR WHEEL
5 - 4
EC514200
Wheel axle
1. Measure:
Wheel axle bends
Out of specification
Use the dial gauge 1.
Wheel axle bending limit:
0.5 mm (0.020 in)
NOTE:
The bending value is shown by one half of the
dial gauge reading.
WARNING
Do not attempt to straighten a bent axle.
EC594200
Brake disc
1. Measure:
Brake disc deflection (only rear brake
disc)
Use the dial gauge 1.
Out of specification
runout.
If wheel runout is in good condition,
replace the brake disc.
Brake disc deflection limit:
Rear:
<Limit>: 0.15 mm (0.006 in)
2. Measure:
Brake disc thickness a
Out of limit
Brake disc thickness:
Front:
3.0 mm (0.12 in)
<Limit>: 2.5 mm (0.10 in)
Rear:
4.0 mm (0.16 in)
<Limit>: 3.5 mm (0.14 in)
CHAS
Replace.
Inspect wheel
Replace.