2002 YAMAHA YZ426F oil

SPEC
2 - 13
MAINTENANCE SPECIFICATIONS
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 = 4.41 N/mm
(0.45 kg/mm,
25.2 lb/in)----
Optional spring/spacer Yes←----
Oil capacity 568 cm
3
(20.0 lmp oz,
19.2 US oz) ←----
Oil level 135 mm (5.31 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 endZero mm (Zero in)←----
Rear suspension: USA, CDN,
AUS, NZ, ZAEUROPE
Shock absorber travel 132 mm
(5.20 in)←----
Spring free length 265 mm
(10.43 in)275 mm
(10.83 in)----
Fitting length 248 mm
(9.76 in)262 mm
(10.31 in)----
245.5 ~ 263.5 mm
(9.67 ~ 10.37 in)255.5 ~ 273.5mm
(10.06 ~ 10.77 in)----
Spring rate, STD K = 53.0 N/mm
(5.40 kg/mm,
302.4 lb/in)K = Approx.
53.0 N/mm
(5.40 kg/mm,
302.4 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)

SPEC
2 - 17
MAINTENANCE SPECIFICATIONS
EC212300
ELECTRICAL
Item Standard Limit
Ignition system:
Advancer type Electrical ----
C.D.I.:
Magneto-model (stator)/manufacturer 5SF-00/YAMAHA ----
Source coil 1 resistance (color) 720 ~ 1,080 Ω at 20 ˚C (68 ˚F)
(Green – Brown)----
Source coil 2 resistance (color) 44 ~ 66 Ω at 20 ˚C (68 ˚F)
(Black – Pink)----
Pickup coil resistance (color) 248 ~ 372 Ω at 20 ˚C (68 ˚F)
(White – Red)----
CDI unit-model/manufacturer 5SF-00/YAMAHA ----
Ignition coil:
Model/manufacturer 5BE-00/YAMAHA ----
Minimum spark gap 6 mm (0.24 in) ----
Primary winding resistance 0.20 ~ 0.30 Ω at 20 ˚C (68 ˚F) ----
Secondary winding resistance 9.5 ~ 14.3 kΩ at 20 ˚C (68 ˚F) ----
Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Stator M6 × 1.0 3 10 1.0 7.2
Rotor M10 × 1.25 1 48 4.8 35
Ignition coil M6 × 1.0 2 7 0.7 5.1

2 - 4
CARACTERISTIQUES D’ENTRETIEN
SPEC

CARACTERISTIQUES D’ENTRETIEN
MOTEUR
Article Standard Limite
Culasse:
Limite de déformation ---- 0,05 mm
(0,002 in)
Cylindre:
Alésage 95,00 à 95,01 mm
(3,7402 à 3,7406 in)----
Limite d’ovalisation ---- 0,05 mm
(0,002 in)
Arbre à cames:
Méthode d’entraînement Transmission par chaîne (gauche) ----
Diamètre intérieur de chapeau d’arbre à cames 22,000 à 22,021 mm
(0,8661 à 0,8670 in)----
Diamètre de roulement d’arbre à cames 21,967 à 21,980 mm
(0,8648 à 0,8654 in)----
Jeu entre arbre à cames et chapeau 0,020 à 0,054 mm
(0,0008 à 0,0021 in)0,08 mm
(0,003 in)
Dimensions de came
Admission“A”31,7 à 31,8 mm
(1,2480 à 1,2520 in)31,6 mm
(1,244 in)
“B”22,95 à 23,05 mm
(0,9035 à 0,9075 in)22,85 mm
(0,900 in)
Echappement“A”31,2 à 31,3 mm
(1,2283 à 1,2323 in)31,1 mm
(1,224 in)
“B”22,95 à 23,05 mm
(0,9035 à 0,9075 in)22,85 mm
(0,900 in)
Limite de voile d’arbre à cames ---- 0,03 mm
(0,0012 in)
A
B

2 - 14
CARACTERISTIQUES D’ENTRETIENSPEC
Roue:
Type de roue avant Roue à rayons ----
Type de roue arrière Roue à rayons ----
Taille/matériau de jante avant 21 × 1,60/aluminum ----
Taille/matériau de jante arrière 19 × 2,15/aluminum ----
Limite de voile de jante:
Radial ---- 2,0 mm (0,08 in)
Latéral ---- 2,0 mm (0,08 in)
Chaîne de transmission:
Type/fabricant DID520DMA2 SDH/DAIDO ----
Nombre de maillons 113 maillons + attache ----
Flèche de la chaîne 40 à 50 mm (1,6 à 2,0 in) ----
Longueur de chaîne (10 maillons) ----152,5 mm (6,00 in)
Frein à disque avant:
Diamètre extérieur × épaisseur 250 × 3,0 mm (9,84 × 0,12 in) 250 × 2,5 mm
(9,84 × 0,10 in)
Epaisseur de plaquette 4,4 mm (0,17 in) 1 mm (0,04 in)
Diamètre intérieur de maître-cylindre 11,0 mm (0,433 in) ----
Diamètre intérieur de cylindre d’étrier 27,0 mm (1,063 in) × 2 ----
Type de liquide de frein DOT n˚4 ----
Frein à disque arrière:
Diamètre extérieur × épaisseur 245 × 4,0 mm (9,65 × 0,16 in) 245 × 3,5 mm
(9,65 × 0,14 in)
Limite de flèche ----0,15 mm (0,006 in)
Epaisseur de plaquette 6,4 mm (0,25 in) 1,0 mm (0,04 in)
Diamètre intérieur de maître-cylindre 12,7 mm (0,500 in) ----
Diamètre intérieur de cylindre d’étrier 27,0 mm (1,063 in) × 1 ----
Type de liquide de frein DOT n˚4 ----
Levier de frein et pédale de frein:
Position du levier de frein 95 mm (3,74 in) ----
Hauteur de la pédale de frein
(hauteur en dessous le haut du repose-pied)5 mm (0,20 in) ----
Jeu de levier d’embrayage (au pivot du levier) 8 à 13 mm (0,31 à 0,51 in) ----
Jeu à la poignée d’accélération 3 à 5 mm (0,12 à 0,20 in) ---- Article Standard Limite

2 - 19
SPEC

LUBRICATION DIAGRAMS
LUBRICATION DIAGRAMS
1
Oil delivery pipe
2
Intake camshaft
3
Exhaust camshaft
4
Oil cleaner element
5
Oil pump
6
Main axle
7
Drive axle

2 - 20
SPEC

LUBRICATION DIAGRAMS
1
Camshaft
2
Connecting rod
3
Oil cleaner element
4
Crankshaft
5
Main axle
6
Drive axle
7
Oil delivery pipe

2 - 21
SPEC

CABLE ROUTING DIAGRAM
EC240000
CABLE ROUTING DIAGRAM
1
Hose guide
2
Brake hose
3
Fuel tank breather hose
4
Oil tank breather hose
5
Clamp
6
Sub wire harness
7
TPS (throttle position
sensor) lead
8
Neutral switch lead
9
Oil hose
0
Hose holder
A
CDI magneto lead
B
Clutch cable
C
Cylinder head breather hose
D
Carburetor breather hose
E
Overflow hose
Å
Pass the clutch cable through
the cable guide.
ı
Pass the fuel tank breather hose
between the handlebar and ten-
sion bar, then insert its end into
the hole of the number plate.
Ç
Pass the decompression cable
under the oil tank breather pipe.
Î
Fasten the CDI magneto lead
and neutral switch lead to the
frame with a plastic locking tie
and cut off the tie end.
‰
Fasten the sub wire harness to
the frame at the white tape for
the sub wire harness with a
plastic locking tie and cut off the
tie end.
Ï
Pass the cylinder head breather
hose along the right side of the
oil tank breather hose.
Ì
Fasten the sub wire harness to
the frame with a plastic locking
tie ends at the lower left of the
frame and cut off the tie end. For
fastening, pass the plastic lock-
ing tie through the upper holes
in the engine brackets.
Ó
Pass the sub wire harness
between the engine brackets.

2 - 22
SPEC

CABLE ROUTING DIAGRAM
È
Fasten the TPS lead (in the
sub wire harness) under the
frame so that it does not con-
tact the carburetor.
Ô
Make sure that the TPS lead
coupler does not go outside the
chassis.

Fasten the TPS lead under the
coupler to the frame with a
plastic locking tie.
Ò
Pass the carburetor breather
hose and overflow hose
between the connecting rod
and cross tube (frame).
˜Fasten the neutral switch lead
and oil hose together with a
plastic locking tie and cut off
the tie end.ˆFasten the cylinder head
breather hose with the hose
holder.
ØFasten the neutral switch lead
to the frame with a plastic band
ends toward the rear of the
frame.
∏Fasten the cylinder head
breather hose with the hose
holder.
ŒPass the clutch cable through
the cable guide.
ÂFasten the neutral switch lead
and CDI magneto lead together
with a plastic band.
ÍPass the clutch cable on the
inside the cylinder head
breather hose.ÊPass the cylinder head
breather hose along the inner
side of the radiator pipe.
ËPass the radiator breather
hose from the right side of the
frame to the left side, over radi-
ator pipe 1, along the inner side
of radiator hose 4 and the radi-
ator, and between the lower
engine bracket, crankcase, oil
hose and the frame.
◊Pass the clutch cable between
the frame and radiator and
over the lower boss on the radi-
ator.