Yamaha YZ450F 2021 - Checking the Clutch Boss; Checking the Pressure Plate; Checking the Push Lever Shaft; Checking the Push Rods

CLUTCH
5-51
EAM30113
CHECKING THE CLUTCH BOSS
1. Check:
• Clutch boss splines
Damage/pitting/wear  Replace the clutch
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”
• Circlip “3”
• Push rod 2 “4”
• Ball “5”
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
3
3
4
4
5
5
New
New