Yamaha YZ 2018 Series, Owner'S Service Manual

Page: 384 / 402

CHASSIS
10-3
TIP
Generally a stiff spring gives a stiff riding feel-
ing. Rebound damping tends to become weak-
er, resulting in lack of a sense of contact with
the road surface or in a vibrating handlebar.
EASB29B394
FRONT FORK SETTING PARTS
• Front fork spring “1”
*For JPN
TIP
The I.D. mark (slits) “a” is proved on the end of
the spring.
EASB29B395
REAR SUSPENSION SETTING
The rear shock absorber setting should be
made depending on the rider’s feeling of an ac-
tual 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 force.
• Change the compression damping force.
EASB29B396
CHOOSING SET LENGTH
1. Place a stand or a block under the engine to
put the rear wheel above the floor, and mea-
sure 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 hold-
ing bolt.
3. Loosen the locknut “1” and make adjustment
by turning the adjuster “2” to achieve the
standard figure from the subtraction of the
length “b” from the length “a”.
Type
Spring
rate N/
mm
Part number
I.D.
Mark
(slits)
STD* 4.1 2GB-23141-A0 |||
4.2 2GB-23141-B0 ||||
4.3
2GB-23141-C0 |||||
STD 4.4
2GB-23141-30 —
2GB-23141-D0 |-|
4.5 2GB-23141-E0 |-||
STIFF 4.6 33D-23141-30 |-|||
a
1
Standard figure
90–100 mm (3.5–3.9 in)