Rear Suspension Adjustments; Rear Suspension Spring Pre-Load - Honda CRF450R 2006 Owner's Manual

The rear suspension can be adjusted for the
rider's weight and riding conditions by changing
the spring pre-load and the rebound and
compression damping.
The rear shock absorber assembly includes a
damper unit that contains high pressure nitrogen
gas. Do not attempt to disassemble, service, or
dispose of the damper; see your Honda dealer.
The instructions found in this owner's manual are
limited to adjustments of the shock assembly
only.
Puncture or exposure to flame may also result in
an explosion, causing serious injury.
Service or disposal should only be done by your
Honda dealer or a qualified mechanic, equipped
with the proper tools, safety equipment and the
official Honda Service Manual.
If your CRF is new, put enough part-throttle
break-in time (about one hour) on it to ensure
that the suspension has worked in.

Rear Suspension Spring Pre-Load

Pre-load should be adjusted when the engine is
cold because it is necessary to remove the
muffler (page 89).
An optional pin spanner is available for turning
the lock nut and adjusting nut to adjust spring
pre-load.
1. Place a workstand under the engine to raise
the rear wheel off the ground.
2. Loosen the connecting tube clamp screw and
remove the rear subframe's three mounting
bolts, then remove the subframe. See page
32.
3. Check that the spring preload is adjusted to
the standard length. Adjust as necessary by
loosening the lock nut (1) and turning the
adjusting nut (2).
Each complete turn of the adjuster nut
changes the spring length by 1/16 in (1.5
mm).
(1)
(3)
(2)
(1) lock nut (3) pin spanners
(2) adjusting nut (4) spring length
To increase spring pre-load:
Loosen the lock nut with the optional pin spanner
(3) and turn the adjusting nut to shorten the
spring length (4). Do not shorten to less than:
9.8 in (249.0 mm)
To decrease spring pre-load:
Loosen the lock nut with the optional pin spanner
(3) and turn the adjusting nut to increase the
spring length (4). Do not increase to more than:
10.15 in (257.7 mm)
Each turn of the adjuster changes spring length
and spring pre-load. One turn equals: spring
length:
1/16 in (1.5 mm)

Rear Suspension Adjustments

Pin spanners should be used for turning the lock
nut and adjusting nut. See page 151 for optional
pin spanners.
Spring preload length (Standard spring)
Standard: 10.11 in (256.7 mm)
9.8 in (249.0 mm)
Min. :
Spring preload length (Optional spring)
Min. (Softer, 5.3 kgf/mm): 9.88 in (251 mm)
Min. (Stiffer, 5.7 kgf/mm): 9.88 in (251 mm)
(4)
Min. (Stiffer, 5.9 kgf/mm): 9.84 in (250 mm)
Adjustments for Competition
111