Honda CRF450R 2017 Owner's Manual & Competition Handbook page 103

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.
(4)
(2)
(2) fork damper piston rod
(4) fork damper assembly
98
Servicing Your Honda
Fork Dumper installation
1. Turn the fork assembly (1) by placing it upside
down.
3
(About (0.2 US oz (5.4 cm ) 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)
(1)
(1) fork assembly
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.
Amount of fork oil left in the fork
(within damper and spring)
minute
5 10 20 35
°C/°F
30/86 6.5 5.7 5.2 4.5
20/68 6.7 6.2 5.4 4.7
10/50 7.3 6.4 5.6 5
0/32 8.6 8.2 7.9 7.6
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.
(2) fork center bolt lock nut
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.
unit: cm 3
55 85 145
4.1 3.7 3.3
(4)
4.4 3.8 3.5
4.6 4.2 3.8
(5)
7.3 6.8 6
(3) slider bushing
(4) seat stopper
(5) back-up ring
(A)
(2)
(A) thread length
(7)
(4)
(5)
(6) (3)
(6) spring seat collar
(7) fork damper