Checking And Adjusting The Steering Head - Yamaha SR400 2014 Service Manual

vehicle is used in dusty areas.
This vehicle has a drive chain with small rubber
O-rings between each side plate. Steam clean-
ing, high-pressure washing, certain solvents,
and the use of a coarse brush can damage
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
EAS21510
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.
Binding/looseness  Adjust the steering
head.
3. Remove:
• Upper bracket
Refer to "STEERING HEAD" on page 4-44.
4. Adjust:
• Steering head
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Remove the lock washer "1", upper ring nut
"2", and rubber washer "3".
PERIODIC MAINTENANCE
b. Tighten the lower ring nut "4" to specification
with a steering nut wrench "5".
TIP
Set the torque wrench at a right angle to the
steering nut wrench.
4
c. After fully loosening the lower ring nut, 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 "CHECKING THE STEERING
HEAD" on page 4-46.
e. Install the rubber washer "1".
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
1
the lower ring nut and tighten the upper ring
nut until their slots are aligned.
2
TIP
3
Make sure the lock washer "3" tab "a" sit correct-
ly in the ring nut slots "b".
3-19
Steering nut wrench
90890-01385
Lower ring nut (initial tightening
torque)
38 Nm (3.8 m·kgf, 27 ft·lbf)
5
Lower ring nut (final tightening
torque)
18 Nm (1.8 m·kgf, 13 ft·lbf)
354-017