Yamaha YZ 2017 Series, Owner'S Service Manual

Page: 245 / 410

CLUTCH
5-44
EASB29B239
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.
EASB29B240 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.
EASB29B241
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.
EASB29B242
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.
Universal clutch holder
90890-04086
Universal clutch holder
YM-91042
Friction plate thickness
2.90–3.10 mm (0.114–0.122 in)
Wear limit
2.85 mm (0.112 in)
3
4
1
2
Warpage limit
0.10 mm (0.004 in)
Clutch spring free length
47.80 mm (1.88 in)
Limit
45.41 mm (1.79 in)