Checking The Tires; Checking And Tightening The Spokes; Checking The Wheels; Checking The Wheel Bearings - Yamaha YZ450F Owner's Service Manual

CHECKING THE TIRES

EASB111106
1. Measure:
• Tire pressure
Out of specification  Regulate.
Tire air pressure (measured on cold
tires)
Front
100 kPa (1.00 kgf/cm
Rear
100 kPa (1.00 kgf/cm
TIP
• 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.
• If the tire valve stem is found tilted, the tire is
considered to be slipping off its position. Cor-
rect the tire position.
EASB111107 CHECKING AND TIGHTENING THE
SPOKES
1. Check:
• Spokes
Bend/damage  Replace.
Loose  Tighten.
TIP
A tight spoke will emit a clear, ringing tone; a
loose spoke will sound flat.
2. Tighten:
• Spokes
2
, 15 psi)
2
, 15 psi)
TIP
• Do not give a half turn (180 °) or more for one
tightening.
• Make sure that tightening after a break-in is
done until the initial looseness in nipples dis-
appears.
• Make sure that tightening is done in stages,
not at a time.

CHECKING THE WHEELS

EASB111108
1. Check:
• Wheel(s)
EWA
Never attempt to make any repairs to the
wheel.
TIP
After replacing a tire or a wheel, always bal-
ance the wheel.

CHECKING THE WHEEL BEARINGS

EASB111109
1. Check:
• Wheel bearings
3-34
Use a spoke nipple wrench "1" for tighten-
ing.
1
Spoke nipple wrench (6–7)
90890-01521
YM-01521
Spokes
2.5 Nm (0.25 m·kgf, 1.8 ft·lbf)
Damage/out-of-round  Replace.
WARNING
Refer to "CHECKING THE FRONT WHEEL"
on page 4-4 and "CHECKING THE REAR
WHEEL" on page 4-8.
CHASSIS