Yamaha YZ450F 2021 - Page 239

CLUTCH
5-53
6. Install:
• Lock washer “1”
• Clutch boss nut “2”
NOTICE
ECA24660
Make sure to tighten to specification; other-
wise, it may damage the other part that is fas-
tened together.
TIP
• Align the notch in the lock washer “1” with the
detent rib “a” of the clutch boss.
• Apply engine oil to the threads and contact sur-
face of the clutch boss nut.
• Use the universal clutch holder “3” to hold the
clutch boss.
7. Bend the lock washer “1” tab.
8. Install:
• Friction plate 1 “1”
• Clutch plate “2”
• Friction plate 2 “3”
TIP
• Install the clutch plates and friction plates alter-
nately on the clutch boss, starting with a friction
plate and ending with a friction plate.
• From the clutch boss side, install the friction
plates in order: friction plate 1  3, friction plate
2 (identification color: purple)  3, and friction
plate 1  2.
• Apply the engine oil on the friction plates and
clutch plates.
9. Install:
• Bearing “1”
• Washer “2”
• Circlip “3”
(to push rod 1 “4”)
TIP
Apply the engine oil on the bearing, washer and
push rod 1.
Clutch boss nut
75 N·m (7.5 kgf·m, 55 lb·ft)
Universal clutch holder
90890-04086
Universal clutch holder
YM-91042
1
1
1
2
3
3
3
E
New
T
R
.
.
a
2
1
1
11
2
22
3
3
3
a. Identification color
1
a
1
3
1
2
2
2
E
E
E
E
New