2002 YAMAHA YZ426F oil change

6. GASOLINE CAN CAUSE INJURY.
If you should swallow some gasoline,
inhale excess gasoline vapors, or
allow any gasoline to get into your
eyes, contact a doctor immediately. If
any gasoline spills onto your skin or
clothing, immediately wash skin areas
with soap and water, and change your
clothes.
7. ONLY OPERATE THE MACHINE IN AN
AREA WITH ADEQUATE VENTILA-
TION.
Never start the engine or let it run for
any length of time in an enclosed area.
Exhaust fumes are poisonous. These
fumes contain carbon monoxide,
which by itself is odorless and color-
less. Carbon monoxide is a dangerous
gas which can cause unconscious-
ness or can be lethal.
8. PARK THE MACHINE CAREFULLY;
TURN OFF THE ENGINE.
Always turn off the engine if you are
going to leave the machine. Do not
park the machine on a slope or soft
ground as it may fall over.
9. THE ENGINE, EXHAUST PIPE, MUF-
FLER, AND OIL TANK WILL BE VERY
HOT AFTER THE ENGINE HAS BEEN
RUN.
Be careful not to touch them or to
allow any clothing item to contact
them during inspection or repair.
10. PROPERLY SECURE THE MACHINE
BEFORE TRANSPORTING IT.
When transporting the machine in
another vehicle, always be sure it is
properly secured and in an upright
position and that the fuel cock is in
the “OFF” position. Otherwise, fuel
may leak out of the carburetor or fuel
tank.

GEN
INFO

1 - 1
DESCRIPTION
EC100000
GENERAL INFORMATION
EC110000
DESCRIPTION
1
Clutch lever
2
Decompression lever
3
Front brake lever
4
Throttle grip
5
Radiator cap
6
Fuel tank cap
7
Oil filler plug/dipstick
8
“ENGINE STOP” button
9
Kick starter
0
Fuel tank
A
Radiator
B
Coolant drain bolt
C
Rear brake pedal
D
Valve joint
E
Fuel cock
F
Cold starter knob
G
Hot starter knob (red)
H
Drive chain
I
Air cleaner
J
Shift pedal
K
Front fork
NOTE:


The machine you have purchased may differ
slightly from those shown in the following.

Designs and specifications are subject to
change without notice.

SPEC

2 - 2
GENERAL SPECIFICATIONS
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 8.0 L (1.76 Imp gal, 2.11 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: USA, CDN, ZA,
AUS, NZEUROPE
Primary reduction system Gear
←
Primary reduction ratio 62/21 (2.952)
←
Secondary reduction system Chain drive
←
Secondary reduction ratio 49/14 (3.500) 48/14 (3.429)
Transmission type Constant mesh,
5-speed
←
Operation Left foot operation
←
Gear ratio: 1st 24/13 (1.846)
←
2nd 23/15 (1.533)
←
3rd 23/18 (1.278)
←
4th 24/22 (1.091)
←
5th 20/21 (0.952)
←
Chassis:
Frame type Semi double cradle
Caster angle 27.8˚
Trail 123 mm (4.84 in)
Tire:
Type With tube
Size (front) 80/100-21 51M (For USA, CDN, ZA, AUS, NZ
and F)
80/100-21 51R (For EUROPE except F)
Size (rear) 110/90-19 62M (For USA, CDN, ZA, AUS, NZ
and F)
110/90-19 NHS (For EUROPE except F)
Tire pressure (front and rear) 100 kPa (1.0 kgf/cm
2

, 15 psi)

2

3 - 1
INSP
ADJ

MAINTENANCE INTERVALS
EC300000
REGULAR INSPECTION AND ADJUSTMENTS
MAINTENANCE INTERVALS
The following schedule is intended as a general guide to maintenance and lubrication. Bear in mind
that such factors as weather, terrain, geographical location, and individual usage will alter the
required maintenance and lubrication intervals. If you are a doubt as to what intervals to follow in
maintaining and lubricating your machine, consult your Yamaha dealer.
ItemAfter
break-inEvery
race
Every
third
(or
500 km)Every
fifth
(or
1,000 km)
As re-
quiredRemarks
ENGINE OIL
Replace
●

●

OIL FILTER
Clean
●●

VALVES
Check the valve clearances.
Inspect
Replace
●

●

●

●
The engine must be cold.
Check the valve seats
and valve stems for wear.
VALVE SPRINGS
Inspect
Replace
●

●
Check the free length and
the tilt.
VALVE LIFTERS
Inspect
Replace
●

●
Check for scratches and
wear.
CAMSHAFTS
Inspect
Replace
●

●
Inspect the camshaft sur-
face.
CAMSHAFT SPROCKETS
Inspect
Replace
●

●
Check for wear on the
teeth and for damage.
PISTON
Inspect
Clean
Replace
●

●

●

●
Inspect crack
Remove carbon
PISTON RING
Inspect
Replace
●

●

●
Check ring end gap
PISTON PIN
Inspect
Replace
●

●

CYLINDER HEAD
Inspect and clean
●
Remove carbon
Change gasket
CYLINDER
Inspect and clean
Replace
●

●
Inspect score marks
Inspect wear
CLUTCH
Inspect and adjust
Replace
●

●

●
Inspect housing, friction
plate, clutch plate and
spring
TRANSMISSION
Inspect
Replace bearing
●

●

INSP
ADJ

PROGRAMME D’ENTRETIEN
FOURCHE AVANT
Contrôler et régler
Changer l’huile
Changer la bague d’étanchéité
●
●●
●
●
Huile de suspension “01”
BAGUE D’ETANCHEITE ET JOINT
ANTIPOUSSIERE DE FOURCHE
AVANT
Nettoyer et lubrifier
●●
Graisse à base de lithium
AMORTISSEUR ARRIERE
Contrôler et régler
Lubrifier
Resserrer
●
●●
●●
(Aprèscon-
duite sous
la pluie)
●
Graisse au bisulfure de
molybdène
GUIDE-CHAINE ET ROULEAU
Contrôler
●●
BRAS OSCILLANT
Contrôler, lubrifier et resserrer
●●
Graisse au bisulfure de
molybdène
BRAS RELAIS, BIELLE
Contrôler, lubrifier et resserrer
●●
Graisse au bisulfure de
molybdène
TETE DE FOURCHE
Contrôler le jeu
Nettoyer et lubrifier
Changer le roulement
●●
●
●
Graisse à base de lithium
PNEU, ROUES
Contrôler la pression de gonflage, le voile
de roue et l’usure des pneus et la tension
des rayons
Resserrer les boulons de la roue dentée
Contrôler les roulements
Changer les roulements
Graisser
●
●●
●
●
●●
Graisse à base de lithium
ACCELERATEUR, CABLES DE COM-
MANDE
Contrôler le cheminement et le branche-
ment
Graisser
●
●●
●
Yamaha lube pour câble ou
Huile moteur SAE 10W-30 PartieAprès
rodageChaque
course
Chaque
3ème (ou
500 km)Chaque
5ème (ou
1.000 km)
Si
néces-
saireRemarques
3 - 3

3 - 16
INSP
ADJ
ENGINE OIL REPLACEMENT
6. If the oil filter is to be replaced during this
oil change, remove the following parts
and reinstall them.
7. Install:
Plain washer 1
Oil strainer (frame) 2
Engine oil hose 3
Bolt (engine oil hose) 4
Engine oil hose clamp 5
Engine skid plate
8. Install:
Gaskets
Oil filter drain bolt
Drain bolt (crankcase)
Drain bolt (frame)
9. Fill:
Oil tank (frame)
10. Install:
Oil filler plug
11. Inspect:
Engine (for oil leaks)
Oil level
Refer to “ENGINE OIL LEVEL INSPEC-
TION”. Replacement steps:
Remove the exhaust pipe.
Remove the oil filter cover 1 and oil filter
element 2.
Check the O-rings 3, if cracked or dam-
aged, replace them with a new one.
Install the oil filter element and oil filter
cover.
T R..
Oil filter cover:
10 Nm (1.0 m • kg, 7.2 ft • lb)
Oil quantity:
Total amount:
1.5 L (1.32 Imp qt, 1.59 US qt)
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)
New
T R..90 Nm (9.0 m · kg, 65 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
T R..2 Nm (0.2 m · kg, 1.4 ft · lb)
New
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
T R..20 Nm (2.0 m · kg, 14 ft · lb)
T R..23 Nm (2.3 m · kg, 17 ft · lb)

INSP
ADJ
CONTROLE DE PRESSION DES PNEUS/CONTROLE ET SERRAGE DES
RAYONS/CONTROLE DE LA ROUE
REIFENLUFTDRUCK KONTROLLIEREN/SPEICHEN KONTROLLIEREN
UND FESTZIEHEN/RÄDER KONTROLLIEREN
REIFENLUFTDRUCK KONTROLLIEREN
1. Messen:
Reifenluftdruck
Unvorschriftsmäßig → Einstellen.
HINWEIS:
Den Reifenluftdruck bei kalten Reifen kon-
trollieren.
Bei zu niedrigem Reifendruck liegt die Rei-
fenwulst nicht fest an, was dazu führen kann,
daß sich der Reifen von der Felge löst.
Ein geneigter Reifenventilschaft deutet an,
daß der Reifen verrutscht ist.
Bei geneigtem Reifenventilschaft muß die
Reifenposition berichtigt werden.
Standard-Reifenluftdruck
100 kPa (1,0 bar)
SPEICHEN KONTROLLIEREN UND
FESTZIEHEN
1. Kontrollieren:
Speichen 1
Verzug/Beschädigung → Erneuern.
Speichen locker → Nachspannen.
2. Festziehen:
Speichen
HINWEIS:
Die Speichen müssen vor und nach dem Ein-
fahren nachgezogen werden. Nach jeder
Übungsfahrt bzw. Rennen die Speichenspan-
nung prüfen.
T R..3 Nm (0,3 m · kg)
RÄDER KONTROLLIEREN
1. Messen:
Felgenschlag
Das Rad anheben und drehen.
Übermäßig → Erneuern. CONTROLE DE PRESSION DES PNEUS
1. Mesurer:
Pression des pneus
Hors spécification → Régler.
N.B.:
Vérifier le pneu alors qu’il est froid.
Des butées de bourrelet lâches permettent au
pneu de se détacher de sa position sur la jante
lorsque la pression des pneus est basse.
Une tige de soupape de pneu inclinée indique que
le pneu se détache de sa position sur la jante.
Si la tige de soupape de pneu est inclinée, le pneu
a tendance à se détacher de sa position. Corriger
la position du pneu.
Pression des pneus standard:
100 kPa (1,0 kgf/cm2, 15 psi)
CONTROLE ET SERRAGE DES RAYONS
1. Contrôler:
Rayons 1
Déformation/endommagement → Changer.
Rayons desserrés → Resserrer.
2. Serrer:
Rayon
N.B.:
Ne pas oublier de retendre les rayons avant et après
le rodage. Après un entraînement ou une course,
contrôler si les rayons ne sont pas détendus.
T R..3 Nm (0,3 m · kg, 2,2 ft · lb)
CONTROLE DE LA ROUE
1. Mesure:
Voile de roue
Soulever la roue et la tourner.
Voile excessif → Changer.
3 - 41

4 - 49
ENG
EMBRAYAGE
KUPPLUNG
Reibscheiben
1. Messen:
Reibscheibenstärke
Unvorschriftsmäßig → Die Reibschei-
ben im Satz erneuern.
Die Reibscheiben an vier Stellen mes-
sen.
Kupplungsscheiben
1. Messen:
Verzug der Kupplungsscheiben
Unvorschriftsmäßig → Kupplungsschei-
ben im Satz erneuern.
Eine Richtplatte 1 und eine Fühlerleh-
re 2 verwenden.
Reibscheibenstärke
2,9–3,1 mm
2,7 mm
Verzugsgrenze
0,1 mm
Druckhebel
1. Kontrollieren:
Druckhebel 1
Verschleiß/Beschädigung → Erneuern.
Druckstangen
1. Kontrollieren:
Druckstange 1 1
Lager 2
Beilagscheibe 3
Druckstange 2 4
Kugel 5
Verschleiß/Beschädigung/Verbiegung
→ Erneuern. Disque de friction
1. Mesurer:
Epaisseur de disque de friction
Hors-spécification → Changer tous les dis-
ques de friction.
Mesurer chaque disque en quatre endroits.
Disque d’embrayage
1. Mesurer:
Voile de disque d’embrayage
Hors-spécification → Changer tous les dis-
ques d’embrayage.
Utiliser une plaque à surfacer 1 et une
jauge d’épaisseur 2.
Epaisseur de disque de friction:
2,9 à 3,1 mm (0,114 à 0,122 in)
: 2,7 mm (0,106 in)
Limite de déformation:
0,1 mm (0,004 in)
Levier de poussée
1. Contrôler:
Levier de poussée 1
Usure/endommagement → Changer.
Tige de poussée
1. Contrôler:
Tige de poussée 1 1
Roulement 2
Rondelle ordinaire 3
Tige de poussée 2 4
Bille 5
Usure/endommagement/déformation →
Changer.