2002 YAMAHA WR 426F gas type

2 - 2
SPECGENERAL SPECIFICATIONS (WR426F)
Oil capacity:
Engine oil
Periodic oil change 1.3 L (1.14 Imp qt, 1.37 US qt)
With oil filter replacement 1.4 L (1.23 Imp qt, 1.48 US qt)
Total amount 1.5 L (1.32 Imp qt, 1.59 US qt)
Coolant capacity (including all routes): 1.2 L (1.06 Imp qt, 1.27 US qt)
Air filter: Wet type element
Fuel:
Type Premium unleaded gasoline only with a
research octane number of 95 or higher.
(Except for ZA)
Premium gasoline (For ZA)
Tank capacity 12 L (2.64 Imp gal, 3.17 US gal)
(For USA, CDN, AUS and NZ)
8.0 L (1.76 Imp gal, 2.11 US gal)
(For EUROPE and ZA)
Reserve 1.6 L (0.35 Imp gal, 0.42 US gal)
(For USA, CDN, AUS and NZ)
1.4 L (0.31 Imp gal, 0.37 US gal)
(For EUROPE and ZA)
Carburetor:
Type FCR-MX39
Manufacturer KEIHIN
Spark plug:
Type/manufacturer CR8E/NGK
U24ESR-N/DENSO
Gap 0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
Clutch type: Wet, multiple-disc
Transmission:
Primary reduction system Gear
Primary reduction ratio 62/21 (2.952)
Secondary reduction system Chain drive
Secondary reduction ratio 50/14 (3.571)
Transmission type Constant mesh, 5-speed
Operation Left foot operation
Gear ratio: 1st 29/12 (2.416)
2nd 26/15 (1.733)
3rd 21/16 (1.312)
4th 21/20 (1.050)
5th 21/25 (0.840)
Chassis:
Frame type Semi double cradle
Caster angle 27.8˚
Trail 123 mm (4.84 in)

2

2 - 3
SPECGENERAL SPECIFICATIONS (WR426F)
Tire:
Type With tube
Size (front) 80/100-21 51M (USA, CDN, ZA)
90/90-21 54R (EUROPE, AUS, NZ)
Size (rear) 110/100-18 64M (USA, CDN, ZA)
130/90-18 69R (EUROPE, AUS, NZ)
Tire pressure (front and rear) 100 kPa (1.0 kgf/cm
2, 15 psi)
Brake:
Front brake type Single disc brake
Operation Right hand operation
Rear brake type Single disc brake
Operation Right foot operation
Suspension:
Front suspension Telescopic fork
Rear suspension Swingarm (link type monocross suspension)
Shock absorber:
Front shock absorber Coil spring/oil damper
Rear shock absorber Coil spring/gas, oil damper
Wheel travel:
Front wheel travel 300 mm (11.8 in)
Rear wheel travel 315 mm (12.4 in)
Electrical:
Ignition system CDI magneto
Headlight type: Quartz bulb (halogen)
Bulb wattage × quantity:
Headlight 12 V 60/55 W × 1
Tail light 12 V 21/5 W × 1

2 - 13
SPECMAINTENANCE SPECIFICATIONS (WR426F)
EC212201
CHASSIS
Item Standard Limit
Steering system:
Steering bearing type Taper roller bearing ----
Front suspension: USA, CDN
AUS, NZ, ZAEUROPE
Front fork travel 300 mm
(11.8 in)←----
Fork spring free length 460 mm
(18.1 in)←455 mm (17.9 in)
Spring rate, STD K = 4.51 N/mm
(0.46 kg/mm,
25.8 lb/in)K = 4.12 N/mm
(0.42 kg/mm,
23.5 lb/in)----
Optional spring/spacer Yes←----
Oil capacity 568 cm
3
(20.0 lmp oz,
19.2 US oz) 578 cm3
(20.3 lmp oz,
19.5 US oz)----
Oil level 135 mm
(5.31 in)125 mm
(4.92 in)----

(From top of outer tube with inner
tube and damper rod fully com-
pressed without spring.)80 ~ 150 mm
(3.15 ~ 5.91 in)←----
Oil grade Suspension oil
“01”←----
Inner tube outer diameter 46 mm (1.81 in)←----
Front fork top end Zero mm
(Zero in)←----
Rear suspension: USA, CDN,
AUS, NZ, ZAEUROPE
Shock absorber travel 132 mm
(5.20 in)←----
Spring free length 260 mm
(10.24 in)←----
Fitting length 246 mm
(9.69 in)247 mm
(9.72 in)----
240.5 ~ 258.5 mm
(9.47 ~ 10.18 in)←----
Spring rate, STD K = 51.0 N/mm
(5.20 kg/mm,
291.2 lb/in)K = 49.0 N/mm
(5.00 kg/mm,
280.0 lb/in)----
Optional spring Yes←----
Enclosed gas pressure 1,000 kPa
(10 kg/cm
2,
142 psi)←----
Swingarm:
Swingarm free play limit
End ---- 1.0 mm (0.04 in)

2 - 19
SPECGENERAL SPECIFICATIONS (WR400F)
Fuel:
Type Premium unleaded gasoline only with a
research octane number of 95 or higher.
Tank capacity 8.0 L (1.76 Imp gal, 2.11 US gal)
Reserve 1.4 L (0.31 Imp gal, 0.37 US gal)
Carburetor:
Type FCR-MX39
Manufacturer KEIHIN
Spark plug:
Type/manufacturer CR8E/NGK
U24ESR-N/DENSO
Gap 0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
Clutch type: Wet, multiple-disc
Transmission:
Primary reduction system Gear
Primary reduction ratio 62/21 (2.952)
Secondary reduction system Chain drive
Secondary reduction ratio 50/14 (3.571)
Transmission type Constant mesh, 5-speed
Operation Left foot operation
Gear ratio: 1st 29/12 (2.416)
2nd 26/15 (1.733)
3rd 21/16 (1.312)
4th 21/20 (1.050)
5th 21/25 (0.840)
Chassis:
Frame type Semi double cradle
Caster angle 27.8˚
Trail 123 mm (4.84 in)
Tire:
Type With tube
Size (front) 90/90-21 54R
Size (rear) 130/90-18 69R
Tire pressure (front and rear) 100 kPa (1.0 kgf/cm
2, 15 psi)
Brake:
Front brake type Single disc brake
Operation Right hand operation
Rear brake type Single disc brake
Operation Right foot operation
Suspension:
Front suspension Telescopic fork
Rear suspension Swingarm (link type monocross suspension)

2 - 20
SPECGENERAL SPECIFICATIONS (WR400F)
Shock absorber:
Front shock absorber Coil spring/oil damper
Rear shock absorber Coil spring/gas, oil damper
Wheel travel:
Front wheel travel 300 mm (11.8 in)
Rear wheel travel 315 mm (12.4 in)
Electrical:
Ignition system CDI magneto
Headlight type: Quartz bulb (halogen)
Bulb wattage × quantity:
Headlight 12 V 60/55 W × 1
Tail light 12 V 21/5 W × 1

2 - 30
SPECMAINTENANCE SPECIFICATIONS (WR400F)
EC212201
CHASSIS
Item Standard Limit
Steering system:
Steering bearing type Taper roller bearing ----
Front suspension: AUS EUROPE
Front fork travel 300 mm
(11.8 in)←----
Fork spring free length 460 mm
(18.1 in)←455 mm (17.9 in)
Spring rate, STD K = 4.51 N/mm
(0.46 kg/mm,
25.8 lb/in)K = 4.12 N/mm
(0.42 kg/mm,
23.5 lb/in)----
Optional spring/spacer Yes←----
Oil capacity 568 cm
3
(20.0 lmp oz,
19.2 US oz) 578 cm3
(20.3 lmp oz,
19.5 US oz)----
Oil level 135 mm
(5.31 in)125 mm
(4.92 in)----

(From top of outer tube with inner
tube and damper rod fully com-
pressed without spring.)80 ~ 150 mm
(3.15 ~ 5.91 in)←----
Oil grade Suspension oil
“01”←----
Inner tube outer diameter 46 mm (1.81 in)←----
Front fork top end Zero mm
(Zero in)←----
Rear suspension: AUS EUROPE
Shock absorber travel 132 mm
(5.20 in)←----
Spring free length 260 mm
(10.24 in)←----
Fitting length 246 mm
(9.69 in)247 mm
(9.72 in)----
240.5 ~ 258.5 mm
(9.47 ~ 10.18 in)←----
Spring rate, STD K = 51.0 N/mm
(5.20 kg/mm,
291.2 lb/in)K = 49.0 N/mm
(5.00 kg/mm,
280.0 lb/in)----
Optional spring Yes←----
Enclosed gas pressure 1,000 kPa
(10 kg/cm
2,
142 psi)←----
Swingarm:
Swingarm free play limit
End ---- 1.0 mm (0.04 in)

5 - 62
CHAS
EC586000
HANDLING NOTE
WARNING
This shock absorber is provided with a
separate type tank filled with high-pressure
nitrogen gas. To prevent the danger of
explosion, read and understand the follow-
ing information before handling the shock
absorber.
The manufacturer can not be held respon-
sible for property damage or personal
injury that may result from improper han-
dling.
1. Never tamper or attempt to disassem-
ble the cylinder or the tank.
2. Never throw the shock absorber into
an open flame or other high heat. The
shock absorber may explode as a
result of nitrogen gas expansion and/
or damage to the hose.
3. Be careful not to damage any part of
the gas tank. A damaged gas tank will
impair the damping performance or
cause a malfunction.
4. Take care not to scratch the contact
surface of the piston rod with the cylin-
der; or oil could leak out.
5. Never attempt to remove the plug at
the bottom of the nitrogen gas tank. It
is very dangerous to remove the plug.
6. When scrapping the shock absorber,
follow the instructions on disposal.
EC587000
NOTES ON DISPOSAL (YAMAHA DEALERS
ONLY)
Before disposing the shock absorber, be sure
to extract the nitrogen gas from valve 1. Wear
eye protection to prevent eye damage from
escaping gas and/or metal chips.
WARNING
To dispose of a damaged or worn-out
shock absorber, take the unit to your
Yamaha dealer for this disposal procedure.
REAR SHOCK ABSORBER

5 - 62
CHAS
HINWEIS ZUM UMGANG MIT DEM
STOSSDÄMPFER
WARNUNG
Der Stoßdämpfer enthält Stick-
stoff unter hohem Druck. Vor
Arbeiten am Stoßdämpfer die fol-
genden Erläuterungen sorgfältig
durchlesen und die gegebenen
Vorsichtsmaßregeln befolgen.
Der Hersteller übernimmt keinerlei
Haftung für Unfälle, Verletzungen
oder Schäden, die auf unsachge-
mäße Behandlung des Stoßdämp-
fers zurückzuführen sind.
1. Den Stoßdämpfer unter kei-
nen Umständen öffnen oder
manipulieren.
2. Den Stoßdämpfer vor Hitze
und offenen Flammen schüt-
zen. Der hitzebedingte
Druckanstieg kann eine Ex-
plosion des Stoßdämpfers
bewirken.
3. Den Gaszylinder vor Verfor-
mung und Beschädigung
schützen. Ein deformierter
Zylinder vermindert die
Dämpfwirkung.
4. Die Kontaktfläche zwischen
Dämpferrohr und Zylinder
nicht zerkratzen, da sonst Öl
austreten kann.
5. UNTER KEINEN UMSTÄN-
DEN die Schraube an der Un-
terseite des Gaszylinders lö-
sen.
6. Den Stoßdämpfer sachge-
mäß entsorgen.
HINWEIS ZUR ENTSORGUNG
(nur Yamaha-Händler)
Vor der Entsorgung des Stoßdämpfers
muß der Gasdruck in dessen Innerem
über das Ventil 1 vollständig abge-
baut werden. Unbedingt eine Schutz-
brille tragen, um Augenverletzungen
durch ausströmendes Gas oder
umherfliegende Metallspäne zu ver-
meiden.
WARNUNG
Den Stoßdämpfer vom Yamaha-
Händler entsorgen lassen.
AMORTISSEUR ARRIERE
FEDERBEIN
AMORTIGUADOR TRASERO
REMARQUES CONCERNANT LA
MANIPULATION
AVERTISSEMENT
Cet amortisseur est muni d’un réser-
voir type séparé contenant de l’azote
sous haute pression. Il doit être de ce
fait manipulé avec une attention parti-
culière. Afin d’éviter les risques
d’explosion, il convient de lire attenti-
vement les instructions suivantes.
Le fabricant de cet amortisseur ne
peut être tenu pour responsable de
tout accident, dommage matériel ou
corporel résultant d’une manipulation
incorrecte.
1. Ne jamais essayer de démonter
l’ensemble cylindre ou le réser-
voir à gaz.
2. Ne jamais jeter un amortisseur
usagé au feu ou l’exposer à une
chaleur intense. L’amortisseur
pourrait exploser suite à la dila-
tation de l’azote qu’il contient
ou à la détérioration du flexible.
3. Prendre garde à ne pas endom-
mager toute partie du réservoir
à gaz. Un réservoir à gaz
endommagé affectera la capa-
cité d’amortissement ou entraî-
nera un mauvais
fonctionnement.
4. Prendre garde à ne pas rayer la
surface de contact de la tige du
piston avec le cylindre; l’huile
pourrait fuir.
5. Ne jamais essayer d’enlever le
plot situé au bas du réservoir à
azote, Il est très dangereux
d’enlever le plot.
6. Pour la mise au rebut de l’amor-
tisseur, suivre les instructions
concernant cette opération.
REMARQUE CONCERNANT LA
MISE AU REBUT DE L’AMORTIS-
SEUR (TRAVAIL A EFFECTUER
CHEZ UN CONCESSIONNAIRE
YAMAHA)
Avant de mettre l’amortisseur au rebut,
ne pas oublier d’extraire l’azote par la
valve 1. Ne pas oublier de porter des
lunettes de protection pour se protéger
les yeux contre les copeaux métalliques
et le gaz qui s’échappe.
AVERTISSEMENT
Pour mettre au rebut un amortisseur
endommagé ou usé, demander conseil
à un concessionnaire Yamaha.NOTA DE MANEJO
ADVERTENCIA
Este amortiguador incorpora un
depósito independiente que contiene
gas nitrógeno de alta presión. Para
evitar el riesgo de una explosión, lea y
asegúrese de comprender la siguiente
información antes de manipular el
amortiguador.
El fabricante no puede hacerse res-
ponsable de los daños a la propiedad o
las lesiones personales derivadas de
una manipulación incorrecta.
1. No golpee ni intente desmontar
el cilindro o el depósito.
2. No tire nunca el amortiguador a
una llama libre ni ninguna otra
fuente de calor excesivo. Podría
explotar el amortiguador como
resultado de la expansión del gas
nitrógeno y dañar el tubo.
3. Tenga especial cuidado en no
dañar ninguna pieza del depó-
sito de gas. Un depósito de gas
dañado puede dar lugar a un
rendimiento deficiente de la
amortiguación.
4. Tenga cuidado de no arañar la
superficie de contacto de la
varilla del pistón con el cilindro;
o podrían producirse fugas de
aceite.
5. No intente nunca extraer el
tapón de la parte inferior del
depósito de gas nitrógeno ya que
podría resultar muy peligroso.
6. Cuando retire el amortiguador,
siga las instrucciones de
desecho.
NOTAS DE DESECHO (SÓLO
PARA CONCESIONARIOS
YAMAHA)
Antes de desechar el amortiguador, ase-
gúrese de extraer el gas nitrógeno de la
válvula 1. Utilice protección ocular
para evitar lesiones debido al escape de
gas o la proyección de virutas metálicas.
ADVERTENCIA
A la hora de desechar un amortigua-
dor dañado o desgastado, lleve la uni-
dad a su concesionario Yamaha.