Checking And Adjusting The Steering Head - Yamaha YZF-R25 Service Manual

these O-rings. Therefore, use only kerosene to
clean the drive chain. Wipe the drive chain dry
and thoroughly lubricate it with engine oil or
chain lubricant that is suitable for O-ring chains.
Do not use any other lubricants on the drive
chain since they may contain solvents that could
damage the O-rings.
Recommended lubricant
Chain lubricant suitable for O-
ring chains
EAS30645
CHECKING AND ADJUSTING THE
STEERING HEAD
1. Stand the vehicle on a level surface.
EWA13120
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
TIP
Place the vehicle on a suitable stand so that the
front wheel is elevated.
2. Check:
• Steering head
Grasp the bottom of the front fork legs and
gently rock the front fork.
Blinding/looseness → Adjust the steering
head.
3. Remove:
• Upper bracket
Refer to "STEERING HEAD" on page 4-70.
4. Adjust:
• Steering head
▼ ▼▼▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼
a. Remove the lock washer "1", the upper ring
nut "2", and the washer "3".
1
2
3
b. Loosen the lower ring nut "4" and then tighten
it to specification with a steering nut wrench
"5".
▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼
PERIODIC MAINTENANCE
TIP
Set the torque wrench at a right angle to the
steering nut wrench.
c. Loosen the lower ring nut completely and
then tighten it to specification with a steering
nut wrench.
EWA13140
WARNING
Do not overtighten the lower ring nut.
d. Check the steering head for looseness or
▼▼▼
binding by turning the front fork all the way in
both directions. If any binding is felt, remove
the lower bracket and check the upper and
lower bearings.
Refer to "STEERING HEAD" on page 4-70.
e. Install the washer "3".
f. Install the upper ring nut "2".
g. Finger tighten the upper ring nut, then align
the slots of both ring nuts. If necessary, hold
the lower ring nut and tighten the upper ring
nut until their slots are aligned.
h. Install the lock washer "1".
TIP
Make sure the lock washer tabs "a" sit correctly
in the ring nut slots "b".
3-19
Steering nut wrench
90890-01403
Exhaust flange nut wrench
YU-A9472
Lower ring nut (initial tightening
torque)
48 Nm (4.8 m·kgf, 35 ft·lbf)
Lower ring nut (final tightening
torque)
18 Nm (1.8 m·kgf, 13 ft·lbf)