Clutch; Removing The Clutch; Checking The Friction Plates; Checking The Clutch Plates - Yamaha YZ450FP 2023 Owner's Service Manual

EAM30108

REMOVING THE CLUTCH

1. Straighten the clutch boss nut rib "a".
2. Remove:
• Clutch boss nut "1"
• Washer "2"
• Sleeve "3"
• Absorber
• Clutch boss
TIP
While holding the sleeve with the clutch holder
"4", loosen the clutch boss nut.
Clutch holder
90890-04199
Universal clutch holder
YM-91042
1 1
EAM30109

CHECKING THE FRICTION PLATES

1. Check:
• Friction plate
Damage/wear  Replace the friction plates
as a set.
2. Measure:
• Friction plate thickness
Out of specification  Replace the friction
plates as a set.
TIP
Measure it at four points on the friction plate.
a
EAM30110

CHECKING THE CLUTCH PLATES

1. Check:
• Clutch plate
Damage  Replace the clutch plates as a
set.
2. Measure:
• Clutch plate warpage
(with a surface plate and thickness gauge)
Out of specification  Replace the clutch
plates as a set.
EAM30111

CHECKING THE CLUTCH SPRING

2 2
1. Check:
• Pressure plate
Damage  Replace.
2. Check:
3 3 3
• Spring retainer
Damage  Replace.
4 4
3. Check:
• Clutch spring
Damage  Replace the clutch spring.
4. Measure:
• Clutch spring free height
Out of specification  Replace the clutch
spring.
5-48

CLUTCH

Friction plate 1 thickness
2.12–2.28 mm (0.083–0.090 in)
Wear limit
2.02 mm (0.080 in)
Friction plate 2 thickness
2.12–2.28 mm (0.083–0.090 in)
Wear limit
2.02 mm (0.080 in)
Thickness gauge
90890-03268
Feeler gauge set
YU-26900-9
Warpage limit
0.10 mm (0.004 in)
Clutch spring free height
5.80 mm (0.228 in)
Clutch spring free height limit
5.51 mm (0.217 in)