2006 YAMAHA WR 450F lock

5 - 28
CHASFRONT FORK
EC556000
HANDLING NOTE
NOTE:
The front fork requires careful attention. So it is
recommended that the front fork be maintained
at the dealers.
CAUTION:
To prevent an accidental explosion of air,
the following instructions should be
observed:
The front fork with a built-in piston rod
has a very sophisticated internal con-
struction and is particularly sensitive to
foreign material.
Use enough care not to allow any foreign
material to come in when the oil is
replaced or when the front fork is disas-
sembled and reassembled.
Before removing the cap bolts or front
forks, be sure to extract the air from the
air chamber completely.
EC553000
REMOVAL POINTS
EC553150
Cap bolt
1. Remove:
Cap bolt 1
From the outer tube.
NOTE:
Before removing the front fork from the
machine, loosen the cap bolt.
2. Remove:
Cap bolt 1
NOTE:
Hold the locknut 2 and remove the cap bolt.

5 - 29
CHAS
EC553201
Inner tube
1. Remove:
Dust seal 1
Stopper ring 2
Using slotted-head screwdriver.
CAUTION:
Take care not to scratch the inner tube.
2. Remove:
Inner tube 1
Oil seal removal steps:
Push in slowly a the inner tube just before
it bottoms out and then pull it back quickly
b.
Repeat this step until the inner tube can
be pulled out from the outer tube.
EC553311
Damper rod
1. Remove:
Base valve 1
Damper rod 2
NOTE:
Use a damper rod holder 3 to lock the damper
rod.
EC554000
INSPECTION
EC554100
Damper rod
1. Inspect:
Damper rod 1
Bend/damage → Replace damper rod.
CAUTION:
The front fork with a built-in piston rod has
a very sophisticated internal construction
and is particularly sensitive to foreign
material.
Use enough care not to allow any foreign
material to come in when the oil is replaced
or when the front fork is disassembled and
reassembled.
Damper rod holder:
YM-01494/90890-01494
FRONT FORK

5 - 30
CHAS
EC554200
Base valve
1. Inspect:
Valve assembly 1
Wear/damage → Replace.
O-ring 2
Damage → Replace.
2
1
EC554400
Fork spring
1. Measure:
Fork spring free length a
Out of specification → Replace.
EC554502
Inner tube
1. Inspect:
Inner tube surface a
Score marks → Repair or replace.
Use #1,000 grit wet sandpaper.
Damaged oil lock piece → Replace.
Inner tube bends
Out of specification → Replace.
Use the dial gauge 1.
NOTE:
The bending value is shown by one half of the
dial gauge reading.
WARNING
Do not attempt to straighten a bent inner
tube as this may dangerously weaken the
tube.
EC554600
Outer tube
1. Inspect:
Outer tube 1
Score marks/wear/damage → Replace.
Fork spring free length:
Standard Limit
460 mm (18.1 in) 455 mm (17.9 in)
Inner tube bending limit:
0.2 mm (0.008 in)
FRONT FORK

5 - 31
CHAS
EC554700
Cap bolt
1. Inspect:
Cap bolt 1
O-ring 2
Air bleed screw 3
Wear/damage → Replace.
FRONT FORK
EC555000
ASSEMBLY AND INSTALLATION
Front fork assembly
1. Wash the all parts in a clean solvent.
2. Install:
Damper rod 1
To inner tube 2.
CAUTION:
To install the damper rod into the inner
tube, hold the inner tube aslant. If the inner
tube is held vertically, the damper rod may
fall into it, damaging the valve inside.
3. Install:
Copper washer 1
O-ring 2
Base valve 3
To inner tube 4.
4. Tighten:
Base valve 1
NOTE:
Use a damper rod holder 2 to lock the
damper rod 3.
Apply the LOCTITE
® on the base valve
thread.
Damper rod holder:
YM-01494/90890-01494
New
T R..55 Nm (5.5 m · kg, 40 ft · lb)

5 - 32
CHASFRONT FORK
5. Install:
Spring guide 1
Locknut 2
To damper rod 3.
NOTE:
Install the spring guide with its smaller dia.
end a facing downward.
With its thread b facing upward, fully finger
tighten the locknut onto the damper rod.
6. Install:
Dust seal 1
Stopper ring 2
Oil seal 3
Oil seal washer 4
Slide metal 5
To inner tube 6.
NOTE:
Apply the fork oil on the inner tube.
When installing the oil seal, use vinyl seat a
with fork oil applied to protect the oil seal lip.
Install the oil seal with its manufacture’s
marks or number facing the axle holder side.
Install the oil seal washer with its projections
b facing upward.
New
New
7. Install:
Piston metal 1
NOTE:
Install the piston metal onto the slot on inner
tube.
New
8. Install:
Outer tube 1
To inner tube 2.

5 - 36
CHASFRONT FORK
21. Measure:
Distance a
Out of specification → Turn into the lock-
nut.
Distance
a:
18 mm (0.71 in) or more
Between damper rod
1 top and
locknut
2 top.
22. Loosen:
Rebound damping adjuster 1
NOTE:
Loosen the rebound damping adjuster finger
tight.
Record the set position of the adjuster (the
amount of turning out the fully turned in posi-
tion).
23. Install:
Push rod 1
Fork spring 2
NOTE:
Install the fork spring with the damper rod 3
pulled up.
After installing the fork spring, hold the
damper rod end so that it will not go down.
24. Install:
Spring seat 1
Cap bolt 2
NOTE:
Fully finger tighten the cap bolt onto the
damper rod.
25. Tighten:
Cap bolt (locknut) 1
NOTE:
Hold the locknut 2 and tighten the cap bolt
with specified torque.
T R..29 Nm (2.9 m · kg, 21 ft · lb)

5 - 36
CHAS
21. Messen:
Abstand
a
Nicht nach Vorgabe
→ In die
Sicherungsmutter hineindrehen.
Abstand a:
Min. 18 mm (0,71 in)
(zwischen der Ober-
kante des Dämpfer-
rohrs 1 und der
Oberkante der Siche-
rungsmutter 2)
22. Lockern:
Einstellschraube (Zugstufen-
Dämpfungskraft)
1
HINWEIS:
Die Einstellschraube für die Zug-
stufen-Dämpfungskraft leicht lok-
kern.
Die Einstellposition notieren (d. h.
die Anzahl Umdrehungen aus der
völlig hineingedrehten Stellung).
23. Montieren:
Druckstange
1
Gabelfeder
2
HINWEIS:
Die Gabelfeder muss bei hochge-
haltenem Dämpferrohr
3 einge-
baut werden.
Nach dem Einbau der Gabelfeder
das Dämpferrohr weiterhin hoch-
halten.
24. Montieren:
Federsitz
1
Gabel-Abdeckschraube
2
HINWEIS:
Die Gabel-Abdeckschraube hand-
fest am Dämpferrohr anschrauben.
25. Festziehen:
Gabel-Abdeckschraube
(Sicherungsmutter)
1
HINWEIS:
Die Sicherungsmutter
2 fest halten
und die Gabel-Abdeckschraube vor-
schriftsmäßig festziehen.
T R..29 Nm (2,9 m · kg, 21 ft · lb)
21. Mesurer:
Distance a
Hors spécifications → Serrer le
contre-écrou.
Distance a:
18 mm (0,71 in) ou plus
Entre le haut de la tige
d’amortissement 1 et le
haut du contre-écrou 2.
22. Desserrer:
Dispositif de réglage de l’amor-
tissement à la détente 1
N.B.:
Desserrer à la main le dispositif de
réglage de l’amortissement à la détente.
Noter le réglage du dispositif de
réglage de l’amortissement à la
détente (le nombre de tours à partir de
la position vissée à fond).
23. Monter:
Tige de commande 1
Ressort de fourche 2
N.B.:
Poser le ressort de fourche avec la tige
d’amortissement 3 sortie.
Après avoir monté le ressort de four-
che, maintenir l’extrémité de la tige
d’amortissement de manière qu’elle ne
descende pas.
24. Monter:
Siège de ressort 1
Boulon capuchon 2
N.B.:
Serrer à fond, manuellement, le boulon
capuchon sur la tige d’amortissement.
25. Serrer:
Boulon capuchon (contre-écrou)
1
N.B.:
Maintenir le contre-écrou 2 et serrer le
bouchon capuchon au couple spécifié.
T R..29 Nm (2,9 m · kg, 21 ft · lb)
21. Medir:
Distancia a
Fuera del valor especificado →
Girar la contratuerca.
Distancia a:
18 mm (0,71 in) o más
Entre la parte superior
de la varilla del amorti-
guador 1 y la parte
superior de la contra-
tuerca 2.
22. Aflojar:
Regulador de la amortiguación en
extensión 1
NOTA:
Afloje el regulador de amortiguación
en extensión a mano.
Anote la posición del regulador (la
cantidad de vueltas a partir de la posi-
ción completamente apretado).
23. Instalar:
Barra de empuje 1
Muelle de la horquilla 2
NOTA:
Instale el muelle de la horquilla con la
varilla del amortiguador 3 levantada.
Después de instalar el muelle de la
horquilla, sostenga el extremo de la
varilla del amortiguador de forma que
no baje.
24. Instalar:
Asiento del muelle 1
Perno capuchino 2
NOTA:
Apriete a mano, completamente, el perno
capuchino en la varilla del amortiguador.
25. Apretar:
Perno capuchino (contratuerca)
1
NOTA:
Sostenga la contratuerca 2 y apriete el
perno capuchino con el par especificado.
T R..29 Nm (2,9 m · kg, 21 ft · lb)
FOURCHE
TELESKOPGABEL
HORQUILLA DELANTERA

5 - 50
CHAS
4. Install:
•Ring nut 1
Tighten the ring nut using the ring nut
wrench 2.
Refer to “STEERING HEAD INSPEC-
TION AND ADJUSTMENT” section in the
CHAPTER 3.
T R..7 Nm (0.7 m · kg, 5.1 ft · lb)
5. 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.
6. Install:
•Plain washer 1
7. Install:
•Front fork 1
•Handle crown 2
•Main switch 3
•Hose guide bracket 4
NOTE:
•Temporarily tighten the pinch bolts (under
bracket).
•Do not tighten the pinch bolts (handle crown)
yet.
8. Install:
•Guide (speed sensor lead) 1
NOTE:
After installing the guide as shown, pass the
speed sensor lead through the guide.
1
STEERING