Rear Suspension Adjustments; Rear Suspension Spring Pre-Load - Honda CRF450X 2017 Owner's Manual & Competition Handbook

Rear Suspension Adjustments

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 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
dealer or a qualified mechanic, equipped with
the proper tools, safety equipment and the Honda
Service Manual.
If your CRF is new, put enough part-throttle
break-in time (about 1 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 62).
Optional pin spanners are available for turning
the lock nut and adjusting nut to adjust spring
pre-load.
1. Place your CRF on an optional workstand or
equivalent support with the rear wheel off the
ground.
2. Lift the subframe to the upright position
(page 39).
126
Adjustments for Competition
17 CRF450X̲31MEY710.indb 126 17 CRF450X̲31MEY710.indb 126
3. Check that the spring pre-load is adjusted to
the standard length. Adjust as necessary by
loosening the shock spring lock nut (1) and
turning the adjusting nut (2).
Each complete turn of the adjusting nut
changes the spring length by 0.06 in (1.5
mm).
4. After adjustment, hold the adjusting nut
and tighten the shock spring lock nut to the
specified torque:
32 lbf·ft (44 N·m, 4.5 kgf·m)
(3)
(1)
(2)
(1) shock spring lock nut (3) pin spanners
(2) adjusting nut (4) spring length
To increase spring pre-load:
Loosen the shock spring lock nut with the
optional pin spanners (3) and turn the adjusting
nut to shorten the spring length (4). Do not
shorten to less than:
9.80 in (249.0 mm)
To decrease spring pre-load:
Loosen the shock spring lock nut with the
optional pin spanners (3) and turn the adjusting
nut to increase the spring length (4). Do not
increase to more than:
10.20 in (259.0 mm)
Each turn of the adjuster changes spring length
and spring pre-load. One turn equals: spring
length/spring pre-load:
0.06 in (1.5 mm)/18.18 lbf (80.85 N)
Pin spanners should be used for turning the shock
spring lock nut and adjusting nut. See page 169
for optional pin spanners.
Spring pre-load length (Standard spring)
Standard: 10.16 in (258.0 mm)
Min.: 9.80 in (249.0 mm)
Spring pre-load length (Optional spring)
Min. (Softer, 296.9 lbf/in (52.0 N/mm)):
9.9 in (251 mm)
(4)
Min. (Stiffer, 319.2 lbf/in (55.9 N/mm)):
9.9 in (251 mm)
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