Honda CRF450RX 2020 User Manual

Adjustments for Competition 145
Front Suspension Adjustments
1. Remove the front suspension (page 98).
2. Disassemble the fork outer tube (page 100).
3. Disassemble the fork damper (page 105).
Fork Oil Capacity:
(CRF450RX)
Standard 27.4 Ibf/in (4.8 N/mm) Fork Spring
(CRF450R/RWE)
Standard 28.6 Ibf/in (5.0 N/mm) Fork Spring
Example: Front fork characteristics when a standard spring
(CRF450RX)
(CRF450R/RWE)
(CRF450RX)
Optional Soft 26.3 Ibf/in (4.6 N/mm) Fork Spring
(CRF450R/RWE)
Optional Soft 27.4 Ibf/in (4.8 N/mm) Fork Spring
(CRF450RX)
Optional Stiff 28.6 Ibf/in (5.0 N/mm) Fork Spring
(CRF450R/RWE)
Optional Stiff 29.7 Ibf/in (5.2 N/mm) Fork Spring
4. Assemble the fork damper (page 110).
5. Refilling the fork oil (page 101).
6. Install the front suspension (page 102).
Fork Oil Adjustment
Standard
oil capacity
CRF450RX
12.3 US oz
(363 cm
3
)
CRF450R/
RWE
12.0 US oz
(356 cm
3
)
Maximum
oil capacity
CRF450RX
13.3 US oz
(394 cm
3
)
Slightly stiffer
as it nears full
compression.
CRF450R/
RWE
13.2 US oz
(389 cm
3
)
Minimum
oil capacity
CRF450RX
10.5 US oz
(309 cm
3
)
Slightly softer
as it nears full
compression.
CRF450R/
RWE
10.3 US oz
(304 cm
3
)
1 scribe mark or
no mark (factory products)
2 scribe marks or
no mark (factory products)
Force (N)
Stroke (mm)
Oil capacity 13.3 US oz (394 cm
3
)
(MAX)
Oil capacity 12.3 US oz (363 cm
3
)
(STANDARD)
Oil capacity 10.5 US oz (309 cm
3
)
(MIN)
Standard
oil capacity
CRF450RX
12.2 US oz
(361 cm
3
)
CRF450R/
RWE
12.2 US oz
(361 cm
3
)
Maximum
oil capacity
CRF450RX
13.3 US oz
(392 cm
3
)
Slightly stiffer
as it nears full
compression.
CRF450R/
RWE
13.3 US oz
(394 cm
3
)
Minimum
oil capacity
CRF450RX
10.4 US oz
(307 cm
3
)
Slightly softer
as it nears full
compression.
CRF450R/
RWE
10.5 US oz
(309 cm
3
)
Force (N)
Stroke (mm)
Oil capacity 13.2 US oz (389 cm
3
)
(MAX)
Oil capacity 12.0 US oz (356 cm
3
)
(STANDARD)
Oil capacity 10.3 US oz (304 cm
3
)
(MIN)
1 scribe mark
1 scribe mark
Standard
oil capacity
CRF450RX
11.8 US oz
(350 cm
3
)
CRF450R/
RWE
11.8 US oz
(350 cm
3
)
Maximum
oil capacity
CRF450RX
12.9 US oz
(381 cm
3
)
Slightly stiffer
as it nears full
compression.
CRF450R/
RWE
13.0 US oz
(383 cm
3
)
Minimum
oil capacity
CRF450RX
10.0 US oz
(296 cm
3
)
Slightly softer
as it nears full
compression.
CRF450R/
RWE
10.1 US oz
(299 cm
3
)
2 scribe marks
3 scribe marks

Honda CRF450RX 2020 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	96.0mm x 62.1mm
Compression Ratio	13.5:1
Induction	Programmed Fuel Injection (PGM-FI), 46mm throttle body
Ignition	Full transistorized ignition
Transmission	5-speed
Final Drive	Chain
Front Brake	Single 260mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	120/80-18
Wheelbase	58.3 inches
Seat Height	37.8 inches
Ground Clearance	12.9 inches
Starter	Electric
Trail	4.6 inches
Front Suspension	49mm inverted fork with rebound and compression damping adjustability; 12.0 inches travel
Rear Suspension	12.4 inches of travel
Valve Train	Unicam, four-valve