Yamaha YZ450FN 2022, Owner'S Service Manual, Page: 162 / 366

FRONT FORK
4-48
7. Install:
• Base valve “1”
(to the damper assembly “2”)
TIP
First bring the damper rod pressure to a maxi-
mum. Then install the base valve while releasing
the damper rod pressure.
8. Check:
• Damper assembly
Not fully stretched

Repeat the steps (1) to
(7).
9. Tighten:
• Base valve “1”
TIP
Hold the damper assembly with the cap bolt ring
wrench “2” and use the cap bolt wrench “3” to
tighten the base valve.
10.After filling, pump the damper assembly “1”
slowly up and down more than 10 times to
distribute the fork oil.
11.While protecting the damper assembly “1”
with a cloth and compressing fully, allow ex-
cessive oil to overflow on the base valve side.
NOTICE
ECA24540
Take care not to damage the damper assem-
bly.
12.Allow the overflowing oil to escape at the hole
“a” in the damper assembly.
TIP
The overflow measures about 10 cm³ (0.34
US oz, 0.35 Imp.oz).
Base valve
28 N·m (2.8 kgf·m, 21 lb·ft)
Cap bolt wrench
90890-01500
Cap bolt wrench
YM-01500
Cap bolt ring wrench
90890-01501
Cap bolt ring wrench
YM-01501
1
1
2
T
R
.
.
1
2
3
1
1