Yamaha YZ450FX 2019 Owner's Service Manual page 245

push lever shaft sliding surface.
1
2. Install:
• Primary driven gear "1"
• Thrust washer "2"
• Clutch boss "3"
TIP
Apply the engine oil on the primary driven gear
inner circumference.
1 1 1
2
3
3
3
3. Install:
• Lock washer "1"
New
• Clutch boss nut "2"
Clutch boss nut
75 N·m (7.5 kgf·m, 55 lb·ft)
ECA24660
NOTICE
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.
E
5-46
Universal clutch holder
90890-04086
Universal clutch holder
YM-91042
1 1 1
3 3 3
4. Bend the lock washer "1" tab.
1
5. 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  1, friction plate
2 (identification color: purple)  6, and friction
plate 1  1.
• Apply the engine oil on the friction plates and
clutch plates.
a
E
3
E
1
2
2
a. Identification color
CLUTCH
a
1
2
2 2 2
1
E
2
E