Yamaha YZ250F(E), Owner'S Service Manual

Page: 231 / 356

CLUTCH
5-38
EAS1SM1233
REMOVING THE CLUTCH
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.
EAS1SM1234
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.
EAS1SM1235
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.
EAS1SM1236 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.
EAS1SM1237
Clutch holder
90890-04086
YM-91042
Friction plate thickness
2.90–3.10 mm (0.114–0.122 in)
Wear limit
2.80 mm (0.110 in)
3
4
1
2
Warpage limit
0.10 mm (0.0039 in)
Clutch spring free length
45.00 mm (1.77 in)
Limit
44.00 mm (1.73 in)