Yamaha YZ450F, Owner'S Service Manual

Page: 634 / 650

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T U N
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 hold-
ing 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 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
.
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.
Standard figure:
90 ~ 100 mm (3.5 ~ 3.9 in)
SETTING