2000 YAMAHA YZ426F oil type

SPEC

2 - 1
GENERAL SPECIFICATIONS
EC200000
SPECIFICATIONS
EC211000
GENERAL SPECIFICATIONS
Model name: YZ426FLC (EUROPE)
YZ426FM (USA)
YZ426F(M) (CDN, AUS, NZ, ZA)
Model code number: 5JG1 (USA)
5JG2 (EUROPE)
5JG4 (CDN, AUS, NZ, ZA)
Dimensions:
Overall length 2,171 mm (85.5 in)
Overall width 827 mm (32.6 in)
Overall height 1,303 mm (51.3 in)
Seat height 998 mm (39.3 in)
Wheelbase 1,490 mm (58.7 in)
Minimum ground clearance 373 mm (14.7 in)
Basic weight:
With oil and full fuel tank 113.5 kg (250 lb)
Engine:
Engine type Liquid cooled 4-stroke, DOHC
Cylinder arrangement Single cylinder, forward inclined
Displacement 426 cm
3

(15.0 Imp oz, 14.4 US oz)
Bore

´

stroke 95.0
´
60.1 mm (3.74
´
2.37 in)
Compression ratio 12.5 : 1
Starting system Kick starter
Lubrication system: Dry sump
Oil type or grade:
Engine oil SAE 20W40 SH or SAE 10W30 SH
Oil capacity:
Engine oil
Periodic oil change 1.5 L (1.32 Imp qt, 1.59 US qt)
With oil filter replacement 1.6 L (1.41 Imp qt, 1.69 US qt)
Total amount 1.7 L (1.50 Imp qt, 1.80 US qt)
Coolant capacity (including all routes): 1.2 L (1.06 Imp qt, 1.27 US qt)
Air filter: Wet type element
-20
-4-10
140
3010
5020
6830
8640 50
104
122¡CTemp.
¡F
10W/30
10W/40
20W/40
20W/50

2

SPEC

2 - 7
MAINTENANCE SPECIFICATIONS
Piston pin bore inside diameter19.004 ~ 19.015 mm
(0.7482 ~ 0.7486 in)19.045 mm
(0.7498 in)
Piston pin outside diameter18.991 ~ 19.000 mm
(0.7477 ~ 0.7480 in)18.971 mm
(0.7469 in)
Piston rings:
Top ring:
Type Barrel ----
Dimensions (B

´

T) 1.2
´
3.5 mm (0.05
´
0.14 in) ----
End gap (installed) 0.20 ~ 0.30 mm
(0.008 ~ 0.012 in)0.55 mm
(0.022 in)
Side clearance (installed) 0.030 ~ 0.065 mm
(0.0012 ~ 0.0026 in)0.13 mm
(0.005 in)
2nd ring:
Type Taper ----
Dimensions (B

´

T) 1.00
´
3.35 mm (0.04
´
0.13 in) ----
End gap (installed) 0.35 ~ 0.50 mm
(0.014 ~ 0.020 in)0.85 mm
(0.033 in)
Side clearance 0.020 ~ 0.055 mm
(0.0008 ~ 0.0022 in)0.13 mm
(0.005 in)
Oil ring:
Dimensions (B

´

T) 2.0
´
2.9 mm (0.08
´
0.11 in) ----
End gap (installed) 0.2 ~ 0.5 mm (0.01 ~ 0.02 in) ----
Crankshaft:
Crank width “A” 61.95 ~ 62.00 mm
(2.439 ~ 2.441 in)----
Runout limit “C” 0.03 mm (0.0012 in) 0.05 mm
(0.002 in)
Big end side clearance “D” 0.15 ~ 0.45 mm
(0.0059 ~ 0.0177 in)0.50 mm
(0.02 in)
Small end free play “F” 0.4 ~ 1.0 mm (0.02 ~ 0.04 in) 2.0 mm
(0.08 in)
Balancer:
Balancer drive method Gear ----
Decompression device:
Type Manual ----
Cable free play 5 ~ 9 mm (0.20 ~ 0.35 in)
Air filter oil grade: Engine oil ----Item Standard Limit
T
B
B
T
B
T

SPEC

2 - 9
MAINTENANCE SPECIFICATIONS
Lubrication system:
Oil filter type Wire mesh type ----
Oil pump type Trochoid type ----
Tip clearance “A” or “B” 0.07 ~ 0.12 mm
(0.0028 ~ 0.0047 in)0.15 mm
(0.006 in)
Side clearance 0.03 ~ 0.08 mm
(0.0012 ~ 0.0031 in)0.15 mm
(0.006 in)
Bypass valve setting pressure 40 ~ 80 kPa (0.4 ~ 0.8 kg/cm
2

,
5.69 ~ 11.38 psi)----
Cooling:
Radiator core size
Width 117.8 mm (4.6 in) ----
Height 260 mm (10.2 in) ----
Thickness 32 mm (1.26 in) ----
Radiator cap opening pressure110 kPa (1.1 kg/cm
2

, 15.6 psi)----
Radiator capacity (total) 0.76 L (0.67 lmp qt, 0.80 US qt) ----
Water pump
Type Single-suction centrifugal pump ----Item Standard Limit

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 = 4.6 N/mm
(0.46 kg/mm,
25.8 lb/in)K = 4.5 N/mm
(0.45 kg/mm,
25.2 lb/in)----
Optional spring/spacer Yes¬----
Oil capacity 578 cm
3
(20.3 lmp oz,
19.5 US oz) ¬----
Oil level 130 mm
(5.12 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 0 mm (0 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 253 mm
(9.96 in)260 mm
(10.24 in)----
247 ~ 265 mm
(9.72 ~ 10.43 in)257 ~ 275 mm
(10.12 ~ 10.83 in)----
Spring rate, STD K = 54.0 N/mm
(5.40 kg/mm,
302.4 lb/in)K = Approx.
54.0 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/manufacturer F5JG/YAMAHA ----
Source coil 1 resistance (color) 720 ~ 1,080 W at 20 ˚C (68 ˚F)
(Green – Brown)----
Source coil 2 resistance (color) 44 ~ 66 W at 20 ˚C (68 ˚F)
(Black – Pink)----
Pickup coil resistance (color) 248 ~ 372 W at 20 ˚C (68 ˚F)
(White – Red)----
CDI unit-model/manufacturer 5JG/YAMAHA ----
Ignition coil:
Model/manufacturer JF2/YAMAHA ----
Minimum spark gap 6 mm (0.24 in) ----
Primary winding resistance 0.20 ~ 0.30 W at 20 ˚C (68 ˚F) ----
Secondary winding resistance 9.5 ~ 14.3 kW 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

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CARACTERISTIQUES D’ENTRETIEN
SPEC

Limite de voile d’arbre à cames ---- 0,03 mm
(0,0012 in)
Chaîne de distribution:
Type de chaîne de distribution/nbre de maillons 92RH2010-120MPX/120 ----
Méthode de réglage de la chaîne de distribution Automatique ----
Soupape, siège de soupape, guide de soupape:
Jeu de soupape (à froid) AD 0,15 à 0,20 mm
(0,0059 à 0,0079 in)----
ECH 0,25 à 0,30 mm
(0,0098 à 0,0118 in)----
Dimensions des soupapes:
“A” diamètre de tête AD 26,9 à 27,1 mm
(1,0591 à 1,0669 in)----
ECH 27,9 à 28,1 mm
(1,0984 à 1,1063 in)----
“B” largeur de face AD 2,26 mm (0,089 in) ----
ECH 2,26 mm (0,089 in) ----
“C” largeur de siège AD0,9 à 1,1 mm (0,0354 à 0,0433 in)1,5 mm
(0,0591 in)
ECH 0,9 à 1,1 mm (0,0354 à 0,0433 in)1,5 mm
(0,0591 in)
“D” épaisseur de rebord AD 1 mm (0,0394 in) 0,85 mm
(0,033 in)
ECH 1 mm (0,0394 in) 0,85 mm
(0,033 in)
Diamètre extérieur de queue AD4,475 à 4,490 mm
(0,1762 à 0,1768 in)----
ECH 4,960 à 4,975 mm
(0,1953 à 0,1959 in)----
Diamètre intérieur du guide AD 4,500 à 4,512 mm
(0,1772 à 0,1776 in)----
ECH 5,000 à 5,012 mm
(0,1969 à 0,1973 in)----
Jeu entre queue et guide AD0,010 à 0,037 mm
(0,0004 à 0,0015 in)0,08 mm
(0,003 in)
ECH 0,025 à 0,052 mm
(0,0010 à 0,0020 in)0,10 mm
(0,004 in) Article Standard Limite
A
Diamètre de tête
B
Largeur de faceC
Largeur de siège
D
Épaisseur de marge
Epaisseur de rebord

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 520DM-DHA/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 245 ´ 3,0 mm (9,65 ´ 0,12 in) 245 ´ 2,5 mm
(9,65 ´ 0,08 in)
Limite de flèche ----0,15 mm (0,006 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 240 ´ 4,0 mm (9,45 ´ 0,16 in) 240 ´ 3,5 mm
(9,45 ´ 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 82,5 mm (3,25 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) 2 à 4 mm (0,08 à 0,16 in) ----
Jeu à la poignée d’accélération 3 à 5 mm (0,12 à 0,20 in) ----Article Standard Limite

3 - 7
INSP
ADJ

RADIATOR CAP INSPECTION
CAUTION:

l
Do not mix more than one type of ethyl-
ene glycol antifreeze containing corro-
sion inhibitors for aluminum engine.
l
Do not use water containing impurities or
oil.
7. Install:
l
Radiator cap
Start the engine and warm it up for a
several minutes.
8. Check:
lCoolant level
Coolant level low ® Add coolant. Handling notes of coolant:
The coolant is harmful so it should be han-
dled with special care.
WARNING
lWhen coolant splashes to your eye.
Thoroughly wash your eye with water
and see your doctor.
lWhen coolant splashes to your
clothes.
Quickly wash it away with water and
then with soap.
lWhen coolant is swallowed.
Quickly make him vomit and take him
to a doctor.
EC355000
RADIATOR CAP INSPECTION
1. Inspect:
lSeal (radiator cap) 1
lValve and valve seat 2
Crack/damage ® Replace.
Exist fur deposits 3 ® Clean or
replace.