Yamaha Wr 450 F Owners Manual

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TUNSETTING
EC727020
Spring preload adjustment
The spring preload is adjusted by installing the
adjustment washer 1 between the fork spring
2 and damper rod 3.
CAUTION:
Do not install three or more adjustment
washers for each front fork.
WARNING
Always adjust each front fork to the same
setting. Uneven adjustment can cause poor
handling and loss of stability.
ÅLoad
ıFork stroke
1Without adjustment washer (standard)
21 adjustment washer
32 adjustment washers
Standard washer quantity:
Zero adjustment washers
Extent of adjustment:
Zero ~ 2 adjustment washers
EC72A001
Setting of spring after replacement
As the front fork setting can be easily affected
by rear suspension, take care so that the
machine front and rear are balanced (in posi-
tion, etc.) when setting the front fork.
1. Use of soft spring
Generally a soft spring gives a soft riding
feeling. Rebound damping tends to
become stronger and the front fork may
sink deeply over a series of gaps.
To set a soft spring:
Change the rebound damping.
Turn out one or two clicks.
Change the compression damping.
Turn in one or two clicks. 
						

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TUN
2. Use of stiff spring
Generally a stiff spring gives a stiff riding
feeling. Rebound damping tends to
become weaker, resulting in lack of a
sense of contact with the road surface or
in a vibrating handlebar.
To set a stiff spring:
Change the rebound damping.
Turn in one or two clicks.
Change the compression damping.
Turn out one or two clicks.
ÅCoverage of spring by weight
ıRider weight
1Soft
2Standard
3Stiff
SETTING 
						

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TUN
EC72P000
Front fork setting parts
Adjustment washer 1 
Front fork spring 2 
[Equal pitch spring]
* For EUROPE
** For AUS, NZ and ZA
[Unequal pitch spring]
NOTE:
The unequal pitch spring is softer in initial
characteristic than the equal pitch spring and
is difficult to bottom out under full compres-
sion.
The I.D. mark (slits) a is proved on the end
of the spring.TYPE (thickness) PART NUMBER
T = 2.3 mm (0.09 in) 4SS-23364-L0
TYPESPRING 
RATESPRING
PART NUMBERI.D. 
MARK 
(slits)
SOFT0.380
0.390
0.400
0.4104SS-23141-10
4SS-23141-20
4SS-23141-30
4SS-23141-40I-I
I-II
I-III
I
*STD 0.420 4SR-23141-L0 –
0.430 4SS-23141-60 III
**STD 0.440 5NL-23141-00 –
0.450 5BE-23141-L0 –
STD 0.460 5GR-23141-L0 –
STIFF 0.470 5GR-23141-00 II-II
TYPESPRING 
RATE 
(approx.)SPRING
PART NUMBERI.D. 
MARK 
(slits)
SOFT
STIFF0.400
0.410
0.420
0.430
0.4405ET-23141-20
5ET-23141-00
5ET-23141-30
5ET-23141-10
5ET-23141-40V
V-I
V-II
V-III
V-IIII
SETTING 
						

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TUN
EC72B000
Rear suspension setting
The rear suspension setting should be made
depending on the rider’s feeling of an actual
run and the circuit conditions.
The rear suspension setting includes the fol-
lowing two factors:
1. Setting of spring preload
Change the set length of the spring.
Change the spring.
2. Setting of damping force
Change the rebound damping.
Change the compression damping.
EC72C001
Choosing set length
1. Place a stand or block under the engine
to put the rear wheel above the floor, and
measure the length a between the rear
wheel axle center and the rear fender
holding bolt.
2. Remove the stand or block from the
engine and with a rider astride the seat,
measure the sunken length b between
the rear wheel axle center and the rear
fender holding bolt.
3. Loosen the locknut 1 and make adjust-
ment by turning the spring adjuster 2 to
achieve the standard figure from the sub-
traction of the length b from the length
a.
Standard figure:
90 ~ 100 mm (3.5 ~ 3.9 in)
SETTING 
						

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TUNSETTING
NOTE:
If the machine is new and after it is broken in,
the same set length of the spring may
change because of the initial fatigue, etc. of
the spring. Therefore, be sure to make re-
evaluation.
If the standard figure cannot be achieved by
adjusting the spring adjuster and changing
the spring set length, replace the spring with
an optional one and make re-adjustment.
EC72G001
Setting of spring after replacement
After replacement, be sure to adjust the spring
to the set length [sunken length 90 ~ 100 mm
(3.5 ~ 3.9 in)] and set it.
1. Use of soft spring
Set the soft spring for less rebound
damping to compensate for its less
spring load. Run with the rebound
damping adjuster one or two clicks on
the softer side and readjust it to suit
your preference.
2. Use of stiff spring
Set the soft spring for more rebound
damping to compensate for its greater
spring load. Run with the rebound
damping adjuster one or two clicks on
the stiffer side and readjust it to suit
your preference.
*Adjusting the rebound damping will be
followed more or less by a change in the
compression damping. For correction,
turn the low compression damping
adjuster on the softer side. 
						

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TUN
CAUTION:
When using a rear cushion other than cur-
rently installed, use the one whose overall
length a does not exceed the standard as
it may result in faulty performance. Never
use one whose overall length is greater
than standard.
ÅCoverage of spring by weight
ıRider weight 
1Soft
2Standard
3Stiff
Length a of standard shock:
490.5 mm (19.31 in)
SETTING 
						

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TUNSETTING
EC72Q000
Rear shock absorber setting parts
Rear shock spring 1 
[Equal pitch spring]
* For EUROPE
** For AUS, NZ and ZA
[Unequal pitch spring]
NOTE:
The unequal pitch spring is softer in initial
characteristic than the equal pitch spring and
is difficult to bottom out under full compres-
sion.
The I.D. color a is marked at the end of the
spring.
Extent of adjustment (spring length)
TYPESPRING 
RATESPRING
PART NUMBERI.D. 
COLOR/
POINTSPRING 
FREE 
LENGTH
SOFT4.3
4.5
4.75UN-22212-00
5UN-22212-10
5UN-22212-20Brown/1
Green/1
Red/1260
260
260
*STD 4.9 5UN-22212-30 Black/1 260
5.1 5UN-22212-40 Blue/1 260
STD 5.2 5UN-22212-90 Purple/1 260
**STD5.3 5UN-22212-50 Yellow/1 260
STIFF5.5
5.75UN-22212-60
5UN-22212-70Pink/1
White/1260
260
TYPESPRING 
RATE
(approx.)SPRING
PART NUMBERI.D. 
COLOR/
POINTSPRING 
FREE 
LENGTH
SOFT
STIFF4.5
4.7
4.9
5.1
5.3
5.5
5.75UN-22212-A0
5UN-22212-B0
5UN-22212-C0
5UN-22212-D0
5UN-22212-E0
5UN-22212-F0
5UN-22212-G0Green/2
Red/2
Black/2
Blue/2
Yellow/2
Pink/2
White/2275
275
275
275
275
275
275
SPRING FREE 
LENGTHEXTENT OF 
ADJUSTMENT b 
260 mm (10.24 in)240.5 ~ 258.5 mm
(9.47 ~ 10.18 in)
275 mm (10.83 in)255.5 ~ 273.5 mm
(10.06 ~ 10.77 in) 
						

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TUNSETTING
EC72H002
Suspension setting
Front fork
NOTE:
If any of the following symptoms is experienced with the standard position as the base, make
resetting by reference to the adjustment procedure given in the same chart.
Before any change, set the rear shock absorber sunken length to the standard figure 90 ~
100 mm (3.5 ~ 3.9 in).
SymptomSection
Check Adjust
JumpLarge 
gapMedium 
gapSmall 
gap
Stiff over entire range

Compression damping
Oil level (oil amount)
SpringTurn adjuster counterclockwise (about 2 clicks) to 
decrease damping.
Decrease oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
Replace with soft spring.
Unsmooth movement 
over entire range

Outer tube
Inner tube
Under bracket tightening 
torqueCheck for any bends, dents, and other noticeable 
scars, etc. If any, replace affected parts.
Retighten to specified torque.
Poor initial 
movement

Rebound damping
Oil sealTurn adjuster counterclockwise (about 2 clicks) to 
decrease damping.
Apply grease in oil seal wall.
Soft over entire range, 
bottoming out

Compression damping
Oil level (oil amount)
SpringTurn adjuster clockwise (about 2 clicks) to increase 
damping.
Increase oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
Replace with stiff spring.
Stiff toward stroke end
Oil level (oil amount) Decrease oil level by about 5 mm (0.2 in).
Soft toward stroke end, 
bottoming out
Oil level (oil amount) Increase oil level by about 5 mm (0.2 in).
Stiff initial movement
Compression dampingTurn adjuster counterclockwise (about 2 clicks) to 
decrease damping.
Low front, tending to 
lower front posture

Compression damping
Rebound damping
Balance with rear end
Oil level (oil amount)Turn adjuster clockwise (about 2 clicks) to increase 
damping.
Turn adjuster counterclockwise (about 2 clicks) to 
decrease damping.
Set sunken length for 95 ~ 100 mm (3.7 ~ 3.9 in) when 
one passenger is astride seat (lower rear posture).
Increase oil level by about 5 mm (0.2 in).
“Obtrusive” front, tend-
ing to upper front pos-
ture

Compression damping
Balance with rear end
Spring
Oil lever (oil amount)Turn adjuster counterclockwise (about 2 clicks) to 
decrease damping.
Set sunken length for 90 ~ 95 mm (3.5 ~ 3.7 in) when 
one passenger is astride seat (upper rear posture).
Replace with soft spring.
Decrease oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in). 
						

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TUNSETTING
Rear shock absorber
NOTE:
If any of the following symptoms is experienced with the standard position as the base, make
resetting by reference to the adjustment procedure given in the same chart.
Adjust the rebound damping in 2-click increments or decrements.
Adjust the low compression damping in 1-click increments or decrements.
Adjust the high compression damping in 1/6 turn increments or decrements.
SymptomSection
Check Adjust
JumpLarge 
gapMedium 
gapSmall 
gap
Stiff, tending to sink

Rebound damping
Spring set lengthTurn adjuster counterclockwise (about 2 clicks) to 
decrease damping.
Set sunken length for 90 ~ 100 mm (3.5 ~ 3.9 in) when 
one passenger is astride seat.
Spongy and unstable

Rebound damping
Low compression damping
SpringTurn adjuster clockwise (about 2 clicks) to increase 
damping.
Turn adjuster clockwise (about 1 click) to increase 
damping.
Replace with stiff spring.
Heavy and dragging

Rebound damping
SpringTurn adjuster counterclockwise (about 2 clicks) to 
decrease damping.
Replace with soft spring.
Poor road gripping

Rebound damping
Low compression damping
High compression damp-
ing
Spring set length
SpringTurn adjuster counterclockwise (about 2 clicks) to 
decrease damping.
Turn adjuster clockwise (about 1 clicks) to increase 
damping.
Turn adjuster clockwise (about 1/6 clicks) to increase 
damping.
Set sunken length for 90 ~ 100 mm (3.5 ~ 3.9 in) when 
one passenger is astride seat.
Replace with soft spring.
Bottoming out

High compression damp-
ing
Spring set length
SpringTurn adjuster clockwise (about 1/6 turn) to increase 
damping.
Set sunken length for 90 ~ 100 mm (3.5 ~ 3.9 in) when 
one passenger in astride seat.
Replace with stiff spring.
Bouncing

Rebound damping
SpringTurn adjuster clockwise (about 2 clicks) to increase 
damping.
Replace with soft spring.
Stiff travel

High compression damp-
ing
Spring set length
SpringTurn adjuster counterclockwise (about 1/6 turn) to
decrease damping.
Set sunken length for 95 ~ 100 mm (3.7 ~ 3.9 in) when 
one passenger is astride seat.
Replace with soft spring. 
						

							PRINTED IN JAPAN
2002.10-2.0×1 CR
(E) PRINTED ON RECYCLED PAPER YAMAHA MOTOR CO., LTD.
2500 SHINGAI IWATA SHIZUOKA JAPAN