Yamaha WR250F Owner's Service Manual page 77

CHECKING THE TIRE PRESSURE
1. Measure:
• Tire pressure
→
Out of specification
Standard tire pressure:
100 kPa (1.0 kgf/cm
15 psi)
• Check the tire while it is cold.
• Loose bead stoppers allow the tire
to slip off its position on the rim
when the tire pressure is low.
• A tilted tire valve stem indicates that
the tire slips off its position on the
rim.
• If the tire valve stem is found tilted,
the tire is considered to be slipping
off its position. Correct the tire posi-
tion.
CHECKING AND TIGHTENING THE
SPOKES
1. Inspect:
• Spokes "1"
→
Bend/damage Replace.
→
Loose spoke Retighten.
2. Tighten:
• Spokes
Spokes:
3 Nm (0.3 m•kg, 2.2
ft•lb)
Be sure to retighten these spokes be-
fore and after break-in. After a prac-
tice or a race check spokes for
looseness.
CHECKING THE WHEELS
1. Inspect:
• Wheel runout
Elevate the wheel and turn it.
Abnormal runout
Adjust.
2. Inspect:
2
,
• Bearing free play
Exist play
CHECKING AND ADJUSTING THE
STEERING HEAD
1. Elevate the front wheel by placing
a suitable stand under the engine.
2. Check:
• Steering stem
Grasp the bottom of the forks and
gently rock the fork assembly
back and forth.
Free play
3. Check:
• Steering smooth action
Turn the handlebar lock to lock.
Unsmooth action
ing ring nut.
4. Adjust:
• Steering ring nut
Steering ring nut adjustment
steps:
a. Remove the headlight.
b. Remove the handlebar and upper
bracket.
→
Replace.
→
Replace.
→
Adjust steering head.
→
Adjust steer-
3-24
CHASSIS
c. Loosen the steering ring nut "1"
using the steering nut wrench "2".
Steering nut wrench:
YU-33975/90890-01403
d. Tighten the steering ring nut "3"
using steering nut wrench "4".
• Apply the lithium soap base grease
on the thread of the steering stem.
• Set the torque wrench to the steer-
ing nut wrench so that they form a
right angle.
Steering nut wrench:
YU-33975/90890-01403
Steering ring nut (initial
tightening):
38 Nm (3.8 m•kg, 27
ft•lb)
e. Loosen the steering ring nut one
turn.
f. Retighten the steering ring nut us-
ing the steering nut wrench.
Avoid over-tightening.
Steering ring nut (final
tightening):
7 Nm (0.7 m•kg, 5.1
ft•lb)
g. Check the steering stem by turn-
ing it lock to lock. If there is any
binding, remove the steering stem
assembly and inspect the steer-
ing bearings.
h. Install the washer "5", collar "6",
upper bracket "7", washer "8",
steering stem nut "9", handlebar
"10", handlebar upper holder "11"
and headlight "12".