Setting Of Spring After Replacement (Rear); Rear Shock Absorber Setting Parts - Yamaha YZ250F(D) Owner's Service Manual

Yz series
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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 re-
bound 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 re-
bound damping to compensate
for its greater spring load. Run
with the rebound damping adjust-
er 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 cor-
rection, turn the low compression
damping adjuster on the softer side.
When using a rear shock absorber
other than currently 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.
Length "a" of standard
shock:
490.5 mm (19.31 in)
REAR SHOCK ABSORBER
SETTING PARTS
• Rear shock spring "1"
[Equal-pitch steel spring]
SPRING
SPRI
PART
NG
TYPE
NUM-
RAT
BER
E
(-22212-)
SOFT
4.3
5UN-00
4.5
5UN-10
4.7
5UN-20
4.9
5UN-30
5.1
5UN-40
5UN-50
STD
5.3
(5UN-K0)
(5UN-L0)
5.5
5UN-60
STIFF
5.7
5UN-70
• The I.D. mark "a" is marked at the
end of the spring.
• Spring specification varies accord-
ing to the color and quantity of I.D.
marks.
7-8
• Extent of adjustment (spring pre-
load)
SPRING
PART
NUMBER
I.D.
(-22212-)
MARK/
5UN-00
Q'TY
5UN-10
5UN-20
Brown/1
5UN-30
Green/1
Red/1
Black/1
Blue/1
5UN-40
Yellow/1
5UN-50
(5UN-K0)
(5UN-L0)
Pink/1
5UN-60
White/1
5UN-70
For the spring preload adjustment, re-
fer to "ADJUSTING THE REAR
SHOCK ABSORBER SPRING PRE-
LOAD" in the CHAPTER 3.
CHASSIS
Maximum
Minimum
Position
in which
the spring
is turned
in 18 mm
Position
(0.71 in)
in which
from its
the spring
free
is turned
length.
in 1.5 mm
Position
(0.06 in)
in which
from its
the spring
free
is turned
length.
in 20 mm
(0.79 in)
from its
free
length.

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