Honda CRF450X Owner's Manual page 124

Front Suspension Adjustments
13.Pour the recommended fork oil (11) into the
outer tube (1).
Recommended Oil:
Honda ULTRA CUSHION OIL SPECIAL 5W
or equivalent.
(11)
(1)
(1) outer tube (11) fork oil
118
Adjustments for Competition
Fork Oil Capacity:
Standard (0.47 kgf/mm) Fork Spring
No mark
1
(factory products)
or
1 scribe mark
2
(aftermarket parts)
Standard oil 332 cm 3
3
capacity (11.2 US oz,
11.7 Imp oz)
3
Maximum oil 402 cm Slightly stiffer as
4
capacity (13.6 US oz, it nears full
14.2 Imp oz) compression.
Minimum oil 306 cm 3 Slightly softer as
5
capacity (10.3 US oz, it nears full
10.8 Imp oz) compression.
Optional Softer (0.45 kgf/mm) Fork Spring
2 scribe marks
8
3
Standard oil 338 cm
capacity (11.4 US oz,
11.9 Imp oz)
Maximum oil 407 cm 3 Slightly stiffer as
capacity (13.8 US oz, it nears full
14.3 Imp oz) compression.
3
Minimum oil 311 cm Slightly softer as
capacity (10.5 US oz, it nears full
10.9 Imp oz) compression.
Optional Stiffer (0.49 kgf/mm) Fork Spring
9 3 scribe marks
3
Standard oil 335 cm
capacity (11.3 US oz,
11.8 Imp oz)
Maximum oil 405 cm 3 Slightly stiffer as
capacity (13.7 US oz, it nears full
6
14.3 Imp oz) compression.
3
Minimum oil 309 cm Slightly softer as
capacity (10.5 US oz, it nears full
10.9 Imp oz) compression.
7
Be sure the oil capacity is the same in both fork
legs.