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Honda CRF450R 2017 User Manual

Honda CRF450R 2017
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Rear Suspension Adjustments
(cont’d)
Adjustments for Competition 127
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
9.41 in (239.0 mm)
Each turn of the adjusting nut changes spring
length and spring pre-load. One turn equals: spring
length/spring pre-load:
Standard: 0.06 in (1.5 mm)/18 lbf (81 N)
Pin spanners should be used for turning the shock
spring lock nut and adjusting nut. See page 156 for
optional pin spanners.
Spring pre-load length (Standard (medium) spring)
Compression Damping
Compression damping may be adjusted in two
stages with separate adjusters.
The high speed compression damping adjuster (1)
is effective when damping adjustment is desired
for high speed operation. The low speed
compression damping adjuster (2) should be used
when damping adjustment is desired at relatively
low speeds.
When adjusting the compression damping
adjusters, make sure to use the proper size tool
to avoid damage.
Both the high and low speed compression
damping can be increased by turning the
appropriate adjuster clockwise.
Adjust the high speed compression damping
adjuster in 1/4 turn increments.
Be sure the high speed compression adjuster is
firmly located in a detent, and not between
positions.
High Speed Damping:
The high speed damping can be adjusted by
turning the hexagonal portion of the compression
damping adjuster.
The high speed compression damping adjuster has
3 1/2 turns or more.
To adjust to the standard position:
1. Turn the adjuster clockwise (harder) until it
will no longer turn (lightly seats).
2. Turn the adjuster counterclockwise (softer) 3 – 3
1/2 turns and adjust it until the punch mark (3) on
the adjuster and the punch mark (4) on the
adjuster body are aligned.
Standard: 9.29 in (236.0 mm)
Max. : 9.33 in (237.0 mm)
Min. : 9.04 in (229.5 mm)
Rear Suspension Damping
(1) high speed compression damping adjuster
(2) low speed compression damping adjuster
(1)
(2)
(3) high speed compression damping adjuster punch
mark
(4) adjuster body punch mark
(3)
(4)
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Honda CRF450R 2017 Specifications

General IconGeneral
Engine Type449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke96.0mm x 62.1mm
Compression Ratio13.5:1
InductionProgrammed Fuel Injection (PGM-FI), 46mm throttle body
TransmissionClose-ratio five-speed
Final Drive#520 Chain; 13T/49T
Rear SuspensionPro-Link Showa single shock with spring preload, rebound and compression damping adjustability; 12.4 inches travel
Front BrakeSingle 260mm disc with twin-piston caliper
Rear BrakeSingle 240mm disc
Front Tire80/100-21
Rear Tire120/80-19
Trail116mm (4.6 inches)
Wheelbase58.3 inches
Seat Height37.8 inches
Valve TrainUnicam, 4-valve
IgnitionFull transistorized
Curb Weight243 pounds

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