Removing The Clutch; Checking The Friction Plates; Checking The Clutch Plates; Checking The Clutch Springs - Yamaha YZ250F Owner's Service Manual

REMOVING THE CLUTCH

EAS1SM5234
1. Remove:
• Clutch boss nut "1"
• Lock washer "2"
• Clutch boss "3"
TIP
• Straighten the lock washer tab.
• While holding the clutch boss with the clutch
holder "4", loosen the clutch boss nut.
Clutch holder
90890-04086
YM-91042
3

CHECKING THE FRICTION PLATES

EAS1SM5235
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 thickness
2.90–3.10 mm (0.114–0.122 in)
Wear limit
2.85 mm (0.112 in)
EAS1SM5236
1
4
5-38

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
"1")
Out of specification  Replace the clutch
plates as a set.
Warpage limit
0.10 mm (0.0039 in)

CHECKING THE CLUTCH SPRINGS

EAS1SM5237
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
45.00 mm (1.77 in)
Limit
44.00 mm (1.73 in)
CLUTCH