Fork Assembly - Honda CRF450R 2011 Owner's Manual

Front Suspension Adjustments
15. Drain the extra oil from the oil holes (7) of the
fork damper oil/spring chamber (8).
By doing above procedure, about 10 cm
oz, 0.4 Imp oz) of fork fluid will be drained from
the damper oil/spring chamber through the oil hole
and cause 205 cm 3 (7.0 US oz, 7.2 Imp oz) of fork
fluid to be left in the chamber.
(8)
(7) oil holes
(8) fork damper oil/spring chamber
Pour the drained oil into a suitable container and
dispose of it in an approved manner (page 148).
NOTICE
Improper disposal of drained fluids is harmful to
the environment.
124
Adjustments for Competition

Fork Assembly

1. Drain the fork oil from the fork assembly (1)
3 (0.3 US
by placing it upside down.
(About 9.8 cm
oil will be left in the outer tube/slider when it is
left inverted for about 20 minutes at 20°C/68°F)
(7)
(1) fork assembly
To properly dispose of drained fluids, refer to You
& the Environment (page 148).
NOTICE
Improper disposal of drained fluids is harmful to
the environment.
Amount of fork oil left in the fork
(without damper and spring)
minute
5
°C/°F
0/32 16.1
10/50 14.9
20/68 13.2
30/86 12.5
(cm 3 )
0°C/32°F
Inverted time
3
(0.3 US oz, 0.3 Imp oz) of fork
(1)
unit: cm
10 20 35 55 85 145
14.2 12.4 10.8 9.8 8.4 7.0
12.5 11.3 9.5 8.0 6.9 5.8
11.4 9.8 7.8 6.6 5.1 4.7
10.2 8.2 6.9 5.8 4.4 3.6
10°C/50°F
20°C/68°F
30°C/86°F
(minutes)
2. Tighten the fork centre bolt lock nut (2) fully
and measure the thread length (A) as shown.
Standard: 16 – 18 mm (0.6 – 0.7 in)
Wipe the oil completely off the fork damper.
(2)
(2) fork centre bolt lock nut
3. Blow out the oil completely off the fork spring
(3) using compressed air.
Install the fork spring and spring retainer (4) to
the fork damper assembly (5).
Install the fork damper assembly to the fork
assembly (1).
3
(4)
(1) fork assembly (4) spring retainer
(3) fork spring (5) fork damper assembly
(A)
(A) thread length
(5)
(3)
(1)