Yamaha YZ250X 2023 Owner's Manual page 104

EAM20111
CLUTCH
EAM30108
REMOVING THE CLUTCH
1. Remove:
• Clutch boss nut "1"
• Lock washer
• Clutch boss "2"
TIP
• While holding the clutch boss with the clutch
holder "3", loosen the clutch boss nut.
• Do not use an impact wrench for removing the
clutch boss nut.
Clutch holder
90890-04199
Universal clutch holder
YM-91042
3
G088993
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.
Friction plate 1 thickness
2.92–3.08 mm (0.115–0.121 in)
Wear limit
2.82 mm (0.111 in)
Friction plate 2 thickness
2.90–3.10 mm (0.114–0.122 in)
Wear limit
2.80 mm (0.110 in)
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
1
CHECKING THE CLUTCH SPRINGS
1. Check:
• Clutch spring
Damage  Replace the clutch springs as a
set.
2
2. Measure:
• Clutch spring free length
Out of specification  Replace the clutch
springs as a set.
EAM30112
CHECKING THE CLUTCH HOUSING
1. Check:
• Clutch housing dogs
Damage/pitting/wear  Deburr the clutch
housing dogs or replace the clutch housing.
TIP
Pitting on the clutch housing dogs will cause er-
ratic clutch operation.
5-1
Thickness gauge
90890-03268
Feeler gauge set
YU-26900-9
Clutch plate thickness
1.50–1.70 mm (0.059–0.067 in)
Warpage limit
0.20 mm (0.008 in)
Clutch spring free length
44.00 mm (1.73 in)
Clutch spring free length limit
41.80 mm (1.65 in)
CLUTCH