2000 YAMAHA YZ426F maintenance

SPEC

2 - 8
MAINTENANCE SPECIFICATIONS
Clutch:
Friction plate thickness 2.9 ~ 3.1 mm
(0.114 ~ 0.122 in)2.7 mm
(0.11 in)
Quantity 9 ----
Clutch plate thickness 1.1 ~ 1.3 mm (0.043 ~ 0.051 in) ----
Quantity 8 ----
Warp limit ---- 0.1 mm
(0.004 in)
Clutch spring free length 44 mm (1.73 in) 43 mm
(1.69 in)
Quantity 6 ----
Clutch housing thrust clearance 0.20 ~ 0.45 mm
(0.0079 ~ 0.0177 in)----
Clutch housing radial clearance 0.010 ~ 0.044 mm
(0.0004 ~ 0.0017 in)----
Clutch release method Inner push, cam push ----
Shifter:
Shifter type Cam drum and guide bar ----
Guide bar bending limit ---- 0.05 mm
(0.002 in)
Kick starter:
Type Ratchet type ----
Carburetor:
USAEUROPE, CDN,
ZA, AUS, NZ
I. D. mark 5JG1 00 5JG2 10 ----
Main jet (M.J) #162
¬
----
Main air jet (M.A.J) #200
¬
----
Jet needle (J.N) OBEKR-4 OBEKQ-4 ----
Cutaway (C.A) 15
¬
----
Pilot air jet 1 (P.A.J.1) #100
¬
----
Pilot outlet (P.O) 0.9
¬
----
Pilot jet (P.J) #42
¬
----
Pilot screw (example) (P.S) 1-3/4 1-1/2 ----
Bypass 1 (B.P.1) 1.0
¬
----
Valve seat size (V.S) 3.8
¬
----
Starter jet 1 (G.S.1) #72
¬
----
Float height (F.H) 8 mm (0.31 in)
¬
----
Engine idle speed 1,700 ~
1,900 r/min
¬
----
Intake vacuum29.3 ~ 32.0 kPa
(220 ~ 240 mmHg,
8.66 ~ 9.45 inHg)
¬
---- Item Standard Limit

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 - 10
MAINTENANCE SPECIFICATIONS
Item Standard
Lubrication chart:
Pressure feed
Splashed scavenge
Oil strainer
Oil pan Oil pump rotor 2
Oil pump rotor 1
Oil tank
Oil filter
Check ball
Cylinder head
Crank pinPiston pinPiston
Drive axleMain axleTransmission gears
Camshaft
Valve lifter

SPEC

2 - 11
MAINTENANCE SPECIFICATIONS
Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Spark plug M10
´
1.0 1 13 1.3 9.4
Camshaft cap M6
´
1.0 10 10 1.0 7.2
Cylinder head (stud bolt) M6
´
1.0 2 7 0.7 5.1
M8
´
1.25 3 15 1.5 11
(bolt) M10
´
1.25 4 44 4.4 32
(nut) M6
´
1.0 2 10 1.0 7.2
M8
´
1.25 2 20 2.0 14
Cylinder head cover M6
´
1.0 2 10 1.0 7.2
Cylinder M6
´
1.0 1 10 1.0 7.2
Timing chain tensioner M6
´
1.0 2 10 1.0 7.2
Tensioner cap bolt M6
´
1.0 1 7 0.7 5.1
Timing chain guide (rear) M6
´
1.0 2 10 1.0 7.2
Decompression shaft M6
´
1.0 1 7 0.7 5.1
Decompression cable guide M6
´
1.0 1 10 1.0 7.2
Exhaust pipe (nut) M8
´
1.25 1 24 2.4 17
(bolt) M8
´
1.25 1 24 2.4 17
Silencer M8
´
1.25 2 35 3.5 25
Silencer clamp M8
´
1.25 1 20 2.0 14
Exhaust pipe protector M6
´
1.0 3 10 1.0 7.2
Clamp (air cleaner joint) M5
´
0.8 1 3 0.3 2.2
Clamp (carburetor joint) M4
´
0.7 1 3 0.3 2.2
Air filter joint clamp M6
´
1.0 1 3 0.3 2.2
Throttle cable cover M5
´
0.8 1 4 0.4 2.9
Air filter element M6
´
1.0 1 2 0.2 1.4
Radiator panel (upper) M6
´
1.0 2 10 1.0 7.2
Radiator M6
´
1.0 6 10 1.0 7.2
Radiator hose clamp M6
´
1.0 8 2 0.2 1.4
Impeller M8 ´ 1.25 1 14 1.4 10
Water pump housing cover M6 ´ 1.0 3 10 1.0 7.2
Coolant drain bolt M6 ´ 1.0 1 10 1.0 7.2
Oil pump cover M5 ´ 0.8 1 4 0.4 2.9
Oil pump M6 ´ 1.0 3 10 1.0 7.2
Engine oil drain bolt (oil filter) M6 ´ 1.0 1 10 1.0 7.2
Oil filter cover M6 ´ 1.0 2 10 1.0 7.2
Oil delivery pipe 1 M10 ´ 1.25 1 20 2.0 14
M8 ´ 1.25 2 18 1.8 13
Oil hose clamp – 2 2 0.2 1.4
Clutch cover M6 ´ 1.0 7 10 1.0 7.2
Crankcase cover (right) M6 ´ 1.0 10 10 1.0 7.2
Crankcase cover (left) M6 ´ 1.0 8 10 1.0 7.2
Crankcase M6 ´ 1.0 12 12 1.2 8.7
Oil drain bolt (crankcase) M12 ´ 1.5 1 20 2.0 1.4
Oil drain bolt (frame) M8 ´ 1.25 1 23 2.3 17

SPEC
2 - 12
MAINTENANCE SPECIFICATIONS
Oil strainer (frame) M18 ´ 1.5 1 90 9.0 65
Crankcase bearing stopper M6 ´ 1.0 15 10 1.0 7.2
Drive axle oil seal stopper M6 ´ 1.0 2 10 1.0 7.2
Ratchet wheel guide M6 ´ 1.0 2 12 1.2 8.7
Kick crank M8 ´ 1.25 1 33 3.3 24
Primary drive gear M20 ´ 1.0 1 75 7.5 54
Clutch boss M20 ´ 1.0 1 75 7.5 54
Clutch spring M6 ´ 1.0 6 8 0.8 5.8
Balancer driven gear M14 ´ 1.0 1 50 5.0 36
Balancer weight plate M6 ´ 1.0 3 10 1.0 7.2
Drive sprocket M20 ´ 1.0 1 75 7.5 54
Shift guide M6 ´ 1.0 2 10 1.0 7.2
Stopper lever M6 ´ 1.0 1 10 1.0 7.2
Segment M8 ´ 1.25 1 30 3.0 22
Neutral switch M5 ´ 0.8 2 4 0.4 2.9 Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb

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 - 14
MAINTENANCE SPECIFICATIONS
Wheel:
Front wheel type Spoke wheel ----
Rear wheel type Spoke wheel ----
Front rim size/material 21 ´ 1.60/Aluminum ----
Rear rim size/material 19 ´ 2.15/Aluminum ----
Rim runout limit:
Radial ---- 2.0 mm (0.08 in)
Lateral ---- 2.0 mm (0.08 in)
Drive chain:
Type/manufacturer 520DM-DHA/DAIDO ----
Number of links 113 links + joint ----
Chain slack 40 ~ 50 mm (1.6 ~ 2.0 in) ----
Chain length (10 links) ----152.5 mm (6.00 in)
Front disc brake:
Disc outside dia. ´ Thickness 245 ´ 3.0 mm (9.65 ´ 0.12 in) 245 ´ 2.5 mm
(9.65 ´ 0.08 in)
Deflection limit ----0.15 mm (0.006 in)
Pad thickness 4.4 mm (0.17 in) 1 mm (0.04 in)
Master cylinder inside dia. 11.0 mm (0.433 in) ----
Caliper cylinder inside dia. 27.0 mm (1.063 in) ´ 2 ----
Brake fluid type DOT #4 ----
Rear disc brake:
Disc outside dia. ´ Thickness 240 ´ 4.0 mm (9.45 ´ 0.16 in) 240 ´ 3.5 mm
(9.45 ´ 0.14 in)
Deflection limit ----0.15 mm (0.006 in)
Pad thickness 6.4 mm (0.25 in) 1.0 mm (0.04 in)
Master cylinder inside dia. 12.7 mm (0.500 in) ----
Caliper cylinder inside dia. 27.0 mm (1.063 in) ´ 1 ----
Brake fluid type DOT #4 ----
Brake lever and brake pedal:
Brake lever position 82.5 mm (3.25 in) ----
Brake pedal height
(vertical height below footrest top)5 mm (0.20 in) ----
Clutch lever free play (at lever pivot) 2 ~ 4 mm (0.08 ~ 0.16 in) ----
Throttle grip free play 3 ~ 5 mm (0.12 ~ 0.20 in) ----Item Standard Limit

SPEC
2 - 15
MAINTENANCE SPECIFICATIONS
NOTE:
1. First, tighten the ring nut approximately 38 Nm (3.8 m • kg, 27 ft • lb) by using the ring nut
wrench, then loosen the ring nut one turn.
2. Retighten the ring nut 7 Nm (0.7 m • kg, 5.1 ft • lb).Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Handle crown and outer tube M8 ´ 1.25 4 23 2.3 17
Under bracket and outer tube M8 ´ 1.25 4 20 2.0 14
Handle crown and steering shaft M24 ´ 1.0 1 145 14.5 105
Handlebar holder (upper) M8 ´ 1.25 4 23 2.3 17
Steering ring nut M28 ´ 1.0 1 Refer to NOTE.
Front fork and cap bolt M48 ´ 1.0 2 30 3.0 22
Front fork and base valve M30 ´ 1.0 2 55 5.5 40
Cap bolt and damper rod (front fork) M12 ´ 1.25 2 29 2.9 21
Bleed screw (front fork) and cap bolt M5 ´ 0.8 2 1 0.1 0.7
Front fork and protector M6 ´ 1.0 6 10 1.0 7.2
Front fork and brake hose holder M6 ´ 1.0 2 10 1.0 7.2
Front fork and hose cover M8 ´ 1.25 1 16 1.6 11
Front fork and hose cover M6 ´ 1.0 1 7 0.7 5.1
Throttle cable cap M5 ´ 0.8 2 4 0.4 2.9
Clutch lever holder M5 ´ 0.8 2 4 0.4 2.9
Decompression lever holder M5 ´ 0.8 2 4 0.4 2.9
Front brake master cylinder and bracket M6 ´ 1.0 2 9 0.9 6.5
Front brake master cylinder cap M4 ´ 0.7 2 2 0.2 1.4
Brake lever mounting (bolt) M6 ´ 1.0 1 7 0.7 5.1
Brake lever mounting (nut) M6 ´ 1.0 1 7 0.7 5.1
Brake lever position locknut M6 ´ 1.0 2 7 0.7 5.1
Cable guide (front brake hose) and guide stay M5 ´ 0.8 1 4 0.4 2.9
Front brake hose union bolt (master cylinder)M10 ´ 1.25 1 30 3.0 22
Front brake hose union bolt (caliper) M10 ´ 1.25 1 30 3.0 22
Front brake caliper and front fork M8 ´ 1.25 2 23 2.3 17
Brake caliper (front and rear) and pad pin plugM10 ´ 1.0 1 3 0.3 2.2
Front brake caliper and pad pin M10 ´ 1.0 1 18 1.8 13
Rear brake caliper and pad pin M10 ´ 1.0 1 18 1.8 13
Brake caliper (front and rear) and bleed screw M8 ´ 1.25 1 6 0.6 4.3
Front wheel axle and nut M16 ´ 1.5 1 105 10.5 75
Front wheel axle holder M8 ´ 1.25 4 23 2.3 17
Front brake disc and wheel hub M6 ´ 1.0 6 12 1.2 8.7
Rear brake disc and wheel hub M6 ´ 1.0 6 14 1.4 10
Brake pedal mounting M8 ´ 1.25 1 19 1.9 13
Rear brake master cylinder and frame M6 ´ 1.0 2 10 1.0 7.2