2000 YAMAHA WR 400F lock

5 - 29
CHASFRONT FORK
EC556000
HANDLING NOTE
NOTE:
The front fork requires careful attention. So it is
recommended that the front fork be main-
tained at the dealers.
CAUTION:
To prevent an accidental explosion of air,
the following instructions should be
observed:
lThe 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.
lBefore 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:
lCap bolt 1
From the outer tube.
NOTE:
Before removing the front fork from the
machine, loosen the cap bolt.
2. Remove:
lCap bolt 1
NOTE:
lWhile compressing the fork spring, set the
thin type spanners 2 between the spacer 3
and spring guide 4.
lHold the locknut 5 and remove the cap bolt.

5 - 29
CHAS
FOURCHE AVANT
TELESKOPGABEL
HORQUILLA DELANTERA
HANDHABUNGSHINWEIS
HINWEIS:
Die Teleskopgabel erfordert beson-
dere Aufmerksamkeit und sollte am
besten vom Yamaha-Händler gewar-
tet werden.
ACHTUNG:
Um einen plötzlichen Druckverlust
und damit verbundene Gefahren
zu vermeiden, unbedingt folgen-
de Hinweise beachten.
lDer feine Teleskopgabel-Mecha-
nismus ist sehr auf Fremdstoffe
anfällig.
Deshalb beim Gabelölwechsel
sowie bei der Demontage und -
Montage darauf achten, daß
keine Fremdstoffe in die Tele-
skopgabel eindringen.
lVor dem Lösen der Verschluß-
schrauben unbedingt die Luft
aus den Gabelbeinen vollstän-
dig ablassen.
AUSBAU
Verschlußschraube
1. Demontieren:
lVerschlußschraube 1
(vom Standrohr)
HINWEIS:
Die Verschlußschrauben vor der Te-
leskopgabel-Demontage lockern.
2. Demontieren:
lVerschlußschraube 1
HINWEIS:
lDie Gabelfeder komprimieren und
dabei einen flachen Schlüssel 2
zwischen dem Distanzstück 3 und
dem Federsitz 4 ansetzen.
lDie Sicherungsmutter 5 gegenhal-
ten und die Verschlußschraube lö-
sen. REMARQUES CONCERNANT LA
MANIPULATION
N.B.:
La fourche avant nécessite une soi-
gneuse attention. Il est donc recom-
mandé de la faire entretenir chez le
revendeur.
ATTENTION:
Pour éviter une explosion accidentelle,
les instructions suivantes doivent être
observées:
lLa construction interne d’une four-
che avant à tige de piston incorpo-
rée est très sophistiquée et est
particulièrement sensible aux subs-
tances étrangères.
Faire suffisamment attention à ne
pas laisser pénétrer de substances
étrangères lorsque l’huile est rem-
placée ou lorsque la fourche avant
est démontée ou remontée.
lAvant de dévisser les boulons capu-
chons ou d’enlever la fourche avant,
être sûr d’avoir complètement
extrait l’air du réservoir d’air.
POINTS DE DEPOSE
Boulon capuchon
1. Déposer:
lBoulon capuchon 1
Du tube externe.
N.B.:
Avant de démonter la fourche avant de la
machine, desserrer le boulon capuchon.
2. Déposer:
lBoulon capuchon 1
N.B.:
lTout en comprimant le ressort de four-
che, placer la clé à ergots fine 2 entre
l’entretoise 3 et le guide de ressort
4.
lMaintenir le contre-écrou 5 et retirer
le boulon capuchon.NOTA DE MANEJO
NOTA:
La horquilla delantera requiere una aten-
ción especial. Por ello, recomendamos
que el mantenimiento de la horquilla
delantera se realice en el concesionario.
PRECAUCION:
Para evitar una explosión accidental,
tenga en cuenta las siguientes instruc-
ciones:
lLa horquilla delantera, con una
varilla del pistón incorporada, tiene
una construcción interna muy sofis-
ticada que es especialmente sensible
a los materiales extraños.
Tenga especial cuidado en que no
penetre ningún material extraño
cuando cambie el aceite o cuando
desmonte la horquilla delantera y la
monte nuevamente.
lAntes de extraer los pernos de la
tapa o las horquillas delanteras, ase-
gúrese de extraer completamente el
aire de la cámara de aire.
PUNTOS DE EXTRACCIÓN
Perno de la tapa
1. Extraer:
lPerno de la tapa 1
Desde el tubo externo.
NOTA:
Antes de extraer la horquilla delantera
del vehículo, afloje el perno de la tapa.
2. Extraer:
lPerno de la tapa 1
NOTA:
lMientras comprime el resorte de la
horquilla, coloque una llave inglesa
delgada 2 entre el separador 3 y la
guía del resorte 4.
lSujete la contratuerca 5 y extraiga el
perno de la tapa.

5 - 30
CHAS
EC553201
Inner tube
1. Remove:
lDust seal 1
lStopper ring 2
Using slotted-head screwdriver.
CAUTION:
Take care not to scratch the inner tube.
2. Remove:
lInner tube 1
EC553311
Damper rod
1. Remove:
lBase valve 1
lDamper rod 2
NOTE:
Use a damper rod holder 3 to lock the damper
rod.
EC554000
INSPECTION
EC554100
Damper rod
1. Inspect:
lDamper 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.Oil seal removal steps:
lPush in slowly a the inner tube just before
it bottoms out and then pull it back quickly
b.
lRepeat this step until the inner tube can
be pulled out from the outer tube.
Damper rod holder:
YM-1423/90890-01423
FRONT FORK

5 - 31
CHAS
EC554200
Base valve
1. Inspect:
lValve assembly 1
Wear/damage ® Replace.
lO-ring 2
Damage ® Replace.
EC554400
Fork spring
1. Measure:
lFork spring free length a
Out of specification ® Replace.
EC554502
Inner tube
1. Inspect:
lInner tube surface a
Score marks ® Repair or replace.
Use #1,000 grit wet sandpaper.
Damaged oil lock piece ® Replace.
lInner 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:
lOuter tube 1
Score marks/wear/damage ® Replace.
Fork spring free length:
Standard
460 mm
(18.1 in)455 mm
(17.9 in)
Inner tube bending limit:
0.2 mm (0.008 in)
FRONT FORK

5 - 32
CHAS

EC554700
Cap bolt
1. Inspect:
l
Cap bolt
1

l
O-ring
2

l
Air bleed screw
3

Wear/damage
®
Replace.
FRONT FORK
EC555000
ASSEMBLY AND INSTALLATION
EC5551A0
Front fork assembly
1. Wash the all parts in a clean solvent.
2. Install:
l
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:
l
Copper washer
1

l
O-ring
2

l
Base valve
3

To inner tube
4
.
4. Tighten:
l
Base valve
1

NOTE:

l
Use a damper rod holder
2
to lock the
damper rod
3
.
l
Apply the LOCTITE
®

on the base valve
thread.
Damper rod holder:
YM-1423/90890-01423
New
T R..55 Nm (5.5 m · kg, 40 ft · lb)

5 - 33
CHAS

FRONT FORK
5. Install:
l
Spring guide
1

l
Locknut
2

To damper rod
3
.
NOTE:

l
Install the spring guide with its cut
a
facing
upward.
l
With its thread
b
facing upward, fully finger
tighten the locknut onto the damper rod.
6. Install:
l
Dust seal
1

l
Stopper ring
2

l
Oil seal
3

l
Plain washer
4

l
Slide metal
5

To inner tube
6
.
NOTE:

l
Apply the fork oil on the inner tube.
l
When installing the oil seal, use vinyl seat
a
with fork oil applied to protect the oil seal lip.
l
Install the oil seal with its manufacture’s
marks or number facing the axle holder side.
New
New

7. Install:
l
Piston metal
1

NOTE:

Install the piston metal onto the slot on inner
tube.
New

8. Install:
l
Outer tube
1

To inner tube
2.

5 - 37
CHASFRONT FORK
21. Measure:
lDistance a
Out of specification ® Turn into the
locknut.
Distance a:
20 mm (0.79 in) or more
Between damper rod 1 top and
locknut 2 top.
22. Loosen:
lRebound damping adjuster 1
NOTE:
lLoosen the rebound damping adjuster finger
tight.
lRecord the set position of the adjuster (the
amount of turning out the fully turned in posi-
tion).
23. Install
lCushion rubber 1
lWasher 2
lSpacer 3
To cap bolt 4.
NOTE:
Install the cushion rubber with its smaller dia.
end a facing the cap bolt.
24. Install:
lPush rod 1
lFork spring 2
NOTE:
lInstall the fork spring with the damper rod 3
pulled up.
lAfter installing the fork spring, hold the
damper rod end so that it will not go down.
25. Install:
lCap bolt 1
Fully tighten the cap bolt onto the
damper rod by hand.

5 - 38
CHASFRONT FORK
26. Tighten:
lCap bolt (locknut) 1
NOTE:
lWhile compressing the fork spring, set the
thin type spanners 2 between the spacer 3
and spring guide 4.
lHold the locknut 5 and tighten the cap bolt
with specified torque.
T R..29 Nm (2.9 m · kg, 21 ft · lb)
27. Install:
lCap bolt 1
To outer tube.
NOTE:
Temporarily tighten the cap bolt.
28. Install:
lProtector guide 1
EC5552A0
Installation
1. Install:
lFront fork 1
NOTE:
lTemporarily tighten the pinch bolts (under
bracket).
lDo not tighten the pinch bolts (handle crown)
yet.
2. Tighten:
lCap bolt 1
3. Adjust:
lFront fork top end a
* For EUROPE
Front fork top end (standard) a:
5 mm (0.20 in)
*Zero mm (Zero in)
T R..30 Nm (3.0 m · kg, 22 ft · lb)