Yamaha Wr 450 F Owners Manual

SPEC
 
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MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS 
ENGINE 
Item Standard Limit
Cylinder head:
Warp limit ---- 0.05 mm 
(0.002 in)
Cylinder:
Bore size 95.00 ~ 95.01 mm 
(3.7402 ~ 3.7406 in)----
Out of round limit ---- 0.05 mm 
(0.002 in)
Camshaft:
Drive method Chain drive (Left) ----
Camshaft cap inside diameter 22.000 ~ 22.021 mm 
(0.8661 ~ 0.8670 in)----
Camshaft journal diameter 21.967 ~ 21.980 mm 
(0.8648 ~ 0.8654 in)----
Shaft-to-cap clearance 0.020 ~ 0.054 mm 
(0.0008 ~ 0.0021...

SPEC
 
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MAINTENANCE SPECIFICATIONS 
Cam chain:
Cam chain type/No. of links 98XRH2010-118M/118 ----
Cam chain adjustment method Automatic ----
Valve, valve seat, valve guide:
Valve clearance (cold) IN 0.10 ~ 0.15 mm 
(0.0039 ~ 0.0059 in)----
EX 0.20 ~ 0.25 mm 
(0.0079 ~ 0.0098 in)----
Valve dimensions:
“A” head diameter IN 26.9 ~ 27.1 mm 
(1.0591 ~ 1.0669 in)----
EX 27.9 ~ 28.1 mm 
(1.0984 ~ 1.1063 in)----
“B” face width IN 2.26 mm (0.089 in) ----
EX 2.26 mm (0.089 in) ----
“C” seat width IN 0.9 ~...

SPEC
 
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MAINTENANCE SPECIFICATIONS 
Valve spring:
Free length IN 37.03 mm (1.46 in) 35.17 mm 
(1.38 in)
EX 37.68 mm (1.48 in) 35.79 mm 
(1.41 in)
Set length (valve closed) IN 27.87 mm (1.10 in) ----
EX 27.38 mm (1.08 in) ----
Compressed force
(installed) IN 111.3 ~ 127.9 N at 27.87 mm
(11.3 ~ 13.0 kg at 27.87 mm, 
24.91 ~ 28.66 lb at 1.10 in)----
EX 127.4 ~ 146.4 N at 27.38 mm
(13.0 ~ 14.9 kg at 27.38 mm, 
28.66 ~ 32.85 lb at 1.08 in)----
Tilt limit IN ---- 2.5˚/ 1.61 mm 
(2.5˚/0.063 in)
EX ----...

SPEC
 
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MAINTENANCE SPECIFICATIONS 
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)0.12 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 ~...

SPEC
 
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MAINTENANCE SPECIFICATIONS 
Clutch:
Friction plate thickness 2.92 ~ 3.08 mm 
(0.115 ~ 0.121 in)2.8 mm 
(0.110 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 48.4 mm (1.91 in) 47.4 mm 
(1.87 in)
Quantity 6 ----
Clutch housing thrust clearance 0.10 ~ 0.35 mm 
(0.0039 ~ 0.0138 in)----
Clutch housing radial clearance 0.010 ~ 0.044 mm 
(0.0004 ~ 0.0017 in)----
Clutch release method Inner...

SPEC
 
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MAINTENANCE SPECIFICATIONS 
Lubrication system:
Oil filter type Paper type ----
Oil pump type Trochoid type ----
Tip clearance “A”0.12 mm or less 
(0.0047 in or less)0.20 mm 
(0.008 in)
Tip clearance “B”0.09 ~ 0.17 mm 
(0.0035 ~ 0.0067 in)0.24 mm 
(0.009 in)
Side clearance 0.03 ~ 0.10 mm 
(0.0012 ~ 0.0039 in)0.17 mm 
(0.007 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 127.8 mm (5.0 in) ----
Height 260 mm (10.2...

SPEC
 
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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
 
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MAINTENANCE SPECIFICATIONS 
Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Spark plug M10S  
× 
 1.0 1 13 1.3 9.4
Camshaft cap M6  
× 
 1.0 10 10 1.0 7.2
Cylinder head blind plug screw M12  
× 
 1.0 1 37 3.7 27
Cylinder head (stud bolt) M6  
× 
 1.0 2 7 0.7 5.1
M8  
× 
 1.25 1 15 1.5 11
(bolt) M10  
× 
 1.25 4 Refer to NOTE.* 
1
 
(nut) M6  
× 
 1.0 2 10 1.0 7.2
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...

SPEC
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MAINTENANCE SPECIFICATIONS
NOTE:
- marked portion shall be checked for torque tightening after break-in or before each race.
NOTE:
*1: Tighten the cylinder head bolts to 30 Nm (3.0 m · kg, 22 ft · lb) in the proper tightening sequence,
remove and retighten the cylinder head bolts to 20 Nm (2.0 m · kg, 14 ft · lb) in the proper tightening
sequence, and then tighten the cylinder head bolts further to reach the specified angle 180˚ in the
proper tightening sequence.Oil check bolt M6 × 1.0 1 10...

SPEC
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MAINTENANCE SPECIFICATIONS
EC212201
CHASSIS
Item Standard Limit
Steering system:
Steering bearing type Taper roller bearing ----
Front suspension: USA, CDN EUROPE AUS, NZ, ZA
Front fork travel 300 mm (11.8 in)←←
Fork spring free length 460 mm (18.1 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)K = 4.31 N/mm 
(0.44 kg/mm, 
24.6 lb/in)
Optional spring/spacer Yes←←
Oil capacity 573 cm
3 
(20.2 lmp oz, 
19.4 US oz) ←←
Oil level 130 mm (5.12...