Yamaha YZ65J Owner's Manual page 38

Instrument and control functions
2
1. Bolt
2. Panel
4. Remove the muffler bolt, and then
4
remove the muffler.
1
2
1. Muffler
2. Muffler bolt
5. Remove the rear frame bolts, and
then remove the rear frame as-
sembly.
2
1. Rear frame assembly
2. Rear frame bolt
1
1. Rear frame assembly
2. Rear frame bolt
1. Locknut
1
2. Spring preload adjusting nut
4-12
1
6. Loosen the locknut.
7. To increase the spring preload
and thereby harden the suspen-
sion, turn the adjusting nut in di-
rection (a). To decrease the spring
preload and thereby soften the
suspension, turn the adjusting nut
in direction (b).
(a)
 A special wrench can be ob-
tained at a Yamaha dealer to
make this adjustment.
 The spring preload setting is
determined
distance A, shown in the illus-
tration. The longer distance A
is, the lower the spring pre-
load; the shorter distance A
is, the higher the spring pre-
load. With each complete
2
1
2
(b)
by measuring