Clutch; Removing The Clutch; Checking The Friction Plates; Checking The Clutch Plates - Yamaha YZ250FX 2021 Owner's Manual

EAM20111

CLUTCH

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REMOVING THE CLUTCH

1. Straighten the clutch boss nut rib "a".
2. Remove:
• Clutch boss nut "1"
• Conical washer "2"
• Clutch boss "3"
TIP
• While holding the clutch boss with the univer-
sal clutch holder "4", loosen the clutch boss
nut.
• Do not use an impact wrench for removing the
clutch boss nut.
Universal clutch holder
90890-04086
Universal clutch holder
YM-91042
2 2 2
3 3
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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.
a
1 1
4 4
5-3
TIP
Measure it at four points on the friction plate.
Friction plate 1 thickness
2.70–2.90 mm (0.106–0.114 in)
Wear limit
2.60 mm (0.102 in)
Friction plate 2 thickness
2.72–2.88 mm (0.107–0.113 in)
Wear limit
2.60 mm (0.102 in)
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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.
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
0.10 mm (0.004 in)
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CHECKING THE CLUTCH SPRINGS

1. Check:
• Clutch spring
Damage  Replace the clutch springs as a
set.
2. Measure:
• Clutch spring free length
Out of specification  Replace the clutch
springs as a set.
Clutch spring free length
44.00 mm (1.73 in)
Clutch spring free length limit
41.80 mm (1.65 in)
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CHECKING THE CLUTCH HOUSING

1. Check:
• Clutch housing dogs "1"
Damage/pitting/wear  Deburr the clutch
CLUTCH