Honda CRF450R 2017 User Manual

98 Servicing Your Honda
Suspension
19. Fully stroke the piston rod (2) by pushing
down the fork damper assembly (4).
Check the piston rod for smooth operation.
If the piston rod operation is not smooth, check
the piston rod for bends or damage.
1. Turn the fork assembly (1) by placing it upside
down.
(About (0.2 US oz (5.4 cm
3
) of fork oil will be
left in the outer tube/slider when it is left
inverted for about 20 minutes at 20 °C/68 °F)
To properly dispose of drained fluids, refer to You
& the Environment on page 144.
NOTICE
Improper disposal of drained fluids is harmful to
the environment.
2. Tighten the fork center bolt lock nut (2) fully
and measure the thread length (A) as shown.
Standard: 0.35 – 0.43 in (9 – 11 mm)
Wipe the oil completely off the fork damper.
3. Apply recommended fork oil to the slider
bushing (3).
Install the seat stopper (4), back-up ring (5)
and spring seat collar (6) to the fork damper
(7).
Make sure the black side of the back-up ring is
seated on the seat stopper side.
(2) fork damper piston rod
(4) fork damper assembly
(4)
(2)
Fork Dumper installation
(1) fork assembly
Amount of fork oil left in the fork
(within damper and spring) unit: cm
3
minute
°C/°F
5 1020355585145
30/86 6.5 5.7 5.2 4.5 4.1 3.7 3.3
20/68 6.7 6.2 5.4 4.7 4.4 3.8 3.5
10/50 7.3 6.4 5.6 5 4.6 4.2 3.8
0/32 8.6 8.2 7.9 7.6 7.3 6.8 6
(1)
(2) fork center bolt lock nut (A) thread length
(3) slider bushing (6) spring seat collar
(4) seat stopper (7) fork damper
(5) back-up ring
(A)
(2)
(4)
(5)
(7)
(4)
(5)
(6) (3)
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Honda CRF450R 2017 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
Transmission	Close-ratio five-speed
Final Drive	#520 Chain; 13T/49T
Rear Suspension	Pro-Link Showa single shock with spring preload, rebound and compression damping adjustability; 12.4 inches travel
Front Brake	Single 260mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	120/80-19
Trail	116mm (4.6 inches)
Wheelbase	58.3 inches
Seat Height	37.8 inches
Valve Train	Unicam, 4-valve
Ignition	Full transistorized
Curb Weight	243 pounds