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■ Engine
Bore x stroke 3.7795 x 2.4464 in (96.000 x 62.138 mm)
Displacement 27.436 cu-in (449.77 cm
3
)
Compression
ratio
13.5 : 1
Valve clearance
(cold)
Intake
0.005 ± 0.001 in (0.13 ± 0.03
mm)
Exhaust
0.011 ± 0.001 in (0.28 ± 0.03
mm)
Recommended
engine oil
API Service Classification SJ or higher except
oils labeled as energy conserving or resource
conserving on the circular API service label,
SAE 10W-30, JASO T 903 standard MA, Pro
Honda GN4 4-stroke oil (USA & Canada) or
Honda 4-stroke oil, or an equivalent
motorcycle oil
Engine oil
capacity
After draining 1.06 US qt (1.00 L)
After draining
and oil filter
change
1.10 US qt (1.04 L)
After
disassembly
1.43 US qt (1.35 L)
Idle speed 2,000 ± 100 rpm
■ Cooling system
Recommended
coolant
Pro Honda HP Coolant
Cooling capacity
After
draining
1.14 US qt (1.08 L)
After
disassembly
1.20 US qt (1.14 L)
■ Drive train
Primary reduction 2.357
Gear ratio
1st 2.133
2nd 1.706
3rd 1.421
4th 1.211
5th 1.043
Final reduction
CRF450RX
3.846
CRF450R/RWE
3.769
Gear shift pattern
Left foot-operated return system
1-N-2-3-4-5
Specifications
Specifications
72
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