Yamaha YZ450FN 2022, Owner'S Service Manual, Page: 236 / 366

CLUTCH
5-50
boss.
TIP
Pitting on the clutch boss splines will cause er-
ratic clutch operation.
EAM30114
CHECKING THE PRESSURE PLATE
1. Check:
•
Pressure plate
Crack/damage

Replace.
EAM30115
CHECKING THE PUSH LEVER SHAFT
1. Check:
•
Push lever shaft
Wear/damage

Replace.
EAM30484
CHECKING THE PUSH RODS
1. Check:
•
Push rod 1 “1”
•
Bearing/Washer “2”
•
Push rod 2 “3”
• Ball “4”
Cracks/damage/wear

Replace.
2. Measure:
• Push rod 2 bending limit
Out of specification

Replace.
EAM30117
CHECKING THE PRIMARY DRIVE GEAR
1. Check:
• Primary drive gear
Damage/wear

Replace the primary drive
and primary driven gears as a set.
Excessive noise during operation

Replace
the primary drive and primary driven gears as
a set.
2. Check:
• Primary-drive-gear-to-primary-driven-gear
free play
Free play exists

Replace the primary drive
and primary driven gears as a set.
EAM30118
CHECKING THE PRIMARY DRIVEN GEAR
1. Check:
• Primary driven gear
Damage/wear

Replace the primary drive
and primary driven gears as a set.
Excessive noise during operation

Replace
the primary drive and primary driven gears as
a set.
EAM30121
INSTALLING THE CLUTCH
1. Install:
• Oil seal “1”
•
Washer “2”
• Circlip “3”
TIP
•
Apply the lithium-soap-based grease on the oil
seal lip.
•
Install the oil seal in parallel with its manufac-
ture’s marks or numbers facing inward.
Push rod bending limit
0.10 mm (0.004 in)
1 1 1
2 2
4 3
5 4
Ne w
Ne w