2006 YAMAHA TTR90 steering

3 - 19
INSP
ADJ
STEERING HEAD INSPECTION AND ADJUSTMENT
Ring nut wrench:
YU-1268/90890-01268
Tighten the ring nut 4 using ring nut
wrench 5 and turn the steering right and
left a few times.
NOTE:
Set the torque wrench to the ring nut wrench
so that they form a right angle.
Ring nut wrench:
YM-33975/90890-01403
T R..
Ring nut (initial tightening):
38 Nm (3.8 m  kg, 27 ft  lb)
Loosen the ring nut one turn.
Retighten the ring nut using the ring nut
wrench.
WARNING
Avoid over-tightening.
T R..
Ring nut (final tightening):
1 Nm (0.1 m  kg, 0.7 ft  lb)
Check the steering shaft by turning it lock
to lock. If there is any binding, remove the
steering shaft assembly and inspect the
steering bearings.
Install the handle crown 6, handlebar 7,
and front fender.
CAUTION:
Install the handlebar holder with its
groove
a facing outward, and tighten
the bolts so that the gaps
b are equal.
T R..
Steering stem bolt:
40 Nm (4.0 m  kg, 2.9 ft  lb)
Front fork cap bolt:
40 Nm (4.0 m  kg, 2.9 ft  lb)
Handlebar upper holder:
13 Nm (1.3 m  kg, 9.4 ft  lb)
5
4
2 3
a
bb

3 - 20
INSP
ADJ
TT-R90E
Steering ring nut
Steering ring nut adjustment steps:
Remove the front fender 1.
Remove the handlebar and handle crown.
Loosen the ring nut 2 using the ring nut
wrench 3.
Ring nut wrench:
YU-1268/90890-01268
Tighten the ring nut 4 using ring nut
wrench 5 and turn the steering right and
left a few times.
NOTE:
Set the torque wrench to the ring nut wrench
so that they form a right angle.
Ring nut wrench:
YM-33975/90890-01403
T R..
Ring nut (initial tightening):
38 Nm (3.8 m  kg, 27 ft  lb)
Loosen the ring nut one turn.
Retighten the ring nut using the ring nut
wrench.
WARNING
Avoid over-tightening.
T R..
Ring nut (final tightening):
1 Nm (0.1 m  kg, 0.7 ft  lb)
Check the steering shaft by turning it lock
to lock. If there is any binding, remove the
steering shaft assembly and inspect the
steering bearings.
Install the handle crown 6, main switch
7, handlebar 8, and front fender.
2 3
5
4
8
7
6
STEERING HEAD INSPECTION AND ADJUSTMENT

3 - 21
INSP
ADJ
STEERING HEAD INSPECTION AND ADJUSTMENT
NOTE:
Install the handlebar holder with its groove
a facing outward.
The upper handlebar holder should be
installed with the punched mark b for-
ward.
CAUTION:
First tighten the bolts on the front side of
the handlebar holder, and then tighten
the bolts on the rear side.
T R..
Steering stem bolt:
40 Nm (4.0 m  kg, 2.9 ft  lb)
Front fork cap bolt:
40 Nm (4.0 m  kg, 2.9 ft  lb)
Handlebar upper holder:
23 Nm (2.3 m  kg, 17 ft  lb)
a

5 - 18
CHASSTEERING
EC560000
STEERING
LS
LS
T R..TIGHTENING STEPS:
Tighten ring nut.
38 Nm (3.8 m  kg, 27 ft  Ib)
Loosen it completely.
Retighten it.
1 Nm (0.1 m  kg, 0.7 ft  Ib)
T R..40 Nm (4.0 m  kg, 29 ft  Ib)
5 9681076 43
21
Extent of removal:
1 Under bracket removal
2 Bearing removal
Extent of removal Order Part name Q’ty Remarks
STEERING REMOVAL
WARNING
Support the machine securely so
there is no danger of it falling over. Preparation for removal Hold the machine by placing the
suitable stand under the engine.
Front fork Refer to “FRONT FORK” section.
1 Steering stem bolt 1
2 Handle crown 1
3 Ring nut 1 Use special tool.
Refer to “STEERING HEAD INSPEC-
TION AND ADJUSTMENT” section in
the CHAPTER 3.
4 Ball race cover 1
5 Under bracket 1
6 Bearing inner race 2
7 Upper bearing ball 19
8 Lower bearing ball 16
9 Dust seal 1
10 Bearing outer race 2
2
1

5 - 19
CHAS
EC563000
REMOVAL POINTS
EC563202
Ring nut
1. Remove:
Ring nut 1
Use the steering nut wrench 2.
WARNING
Support the steering shaft so that it may
not fall down.
Steering nut wrench:
YU-33975/90890-01403
Bearing race
1. Remove:
Bearing race 1
Remove the bearing race using long rod
2 and the hammer.
EC563300
Bearing (lower)
1. Remove:
Bearing (lower) 1
Use the floor chisel 2.
CAUTION:
Take care not to damage the steering shaft
thread.
STEERING