User Manual - Page 175

For 2019 CRF450X.

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Specifications
Technical Information 169
Item English Metric
Dimension
Overall length 86.3 in 2,191 mm
Overall width 32.2 in 818 mm
Overall height 50.3 in 1,278 mm
Wheelbase 58.7 in 1,491 mm
Seat height 37.9 in 963 mm
Footpeg height 16.4 in 417 mm
Ground clearance 13.1 in 333 mm
Frame
Type Twin tube
F. suspension
Telescopic fork,
travel 10.55 in (268 mm)
stroke 12.01 in (305 mm)
R. suspension
Pro-link,
travel 11.81 in (300 mm)
Tire size, front
80/100-21 51M
DUNLOP MX52F
Tire size, rear
110/100-18 64M
DUNLOP MX52
Tire type bias-ply, tube
Tire pressure, front
(cold)
22 psi (150 kPa, 1.50 kgf/cm
2
)
Tire pressure, rear
(cold)
22 psi (150 kPa, 1.50 kgf/cm
2
)
F. brake, swept area
Single disc brake
56.0 in
2
(361.0
cm
2
)
R. brake, swept
area
Single disc brake
60.5 in
2
(390.3
cm
2
)
Fuel
unleaded gasoline, pump octane
number of 91 or higher
Fuel tank capacity
2.01 US gal
7.6 ℓ
Caster angle 27°36’
Trail length 5.6 in 143 mm
Fork oil capacity
(except damper)
12.2 US oz 361 cm
3
Fork oil capacity
(damper)
8.2 US oz 243 cm
3
Item English Metric
Engine
Type Liquid cooled, 4-stroke
Cylinder
arrangement
Single 10° inclined
from vertical
Bore and stroke 3.78 x 2.44 in 96.0 x 62.1mm
Displacement 27.4 cu-in 449 cm
3
Compression ratio 12.0 : 1
Valve clearance
(cold)
Intake: 0.004 ± 0.001 in
(0.11 ± 0.03 mm)
Exhaust:0.011 ± 0.001 in
(0.28 ± 0.03 mm)
Engine oil capacity
after draining 1.16 US qt 1.10 ℓ
after draining and
oil filter change
1.22 US qt 1.15
after
disassembly
1.53 US qt 1.45
Throttle body
Identification
number
GQ2HA
Idle speed 1,800 ± 100 rpm
Cooling system
Cooling capacity
after draining 1.20 US qt 1.14 ℓ
after
disassembly
1.31 US qt 1.24
Item English Metric
Drive train
Clutch type Wet, multi-plate type
Transmission 6-speed, constant mesh
Primary reduction 2.357
Gear ratio I 2.357
Gear ratio II 1.705
Gear ratio III 1.300
Gear ratio IV 1.090
Gear ratio V 0.916
Gear ratio VI 0.793
Final reduction 3.923
Gear shift pattern
Left foot-operated return
system 1-N-2-3-4-5-6
Electrical
Battery
HY93-C lithium-ion (li-ion)
12V-4.5 Ah (20HR)
Ignition ECM
Starting system Electric
Spark plug NGK
Standard SILMAR9A-9S
For extended high
speed riding
NGK
SILMAR10A-9S
Spark plug gap
0.031 – 0.035 in
(0.8 – 0.9 mm)
Lights
headlight 12 V 35 W
taillight LED
Fuse
Main fuse 20 A
Other fuse 10 A
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