Removing The Clutch; Checking The Friction Plates; Checking The Clutch Plates; Checking The Clutch Springs - Yamaha WR450FB 2012 Owner's Service Manual

EAS25070

REMOVING THE CLUTCH

1. Straighten the lock washer tab.
2. Remove:
• Clutch boss nut "1"
• Conical washer "2"
• Clutch boss "3"
TIP
While holding the clutch boss with the universal
clutch holder "4", loosen the clutch boss nut.
Universal clutch holder
90890-04086
YM-91042
EAS25100

CHECKING THE FRICTION PLATES

The following procedure applies to all of the
friction plates.
1. Check:
• Friction plate
Damage/wear Replace the friction plates
as a set.
2. Measure:
• Friction plate thickness
Out of specification
plates as a set.
TIP
Measure the friction plate at four places.
Friction plate thickness
2.92–3.08 mm (0.115–0.121 in)
Wear limit
2.82 mm (0.1110 in)
Replace the friction
6-39
EAS25110

CHECKING THE CLUTCH PLATES

The following procedure applies to all of 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
plates as a set.
Warpage limit
0.10 mm (0.0039 in)
EAS25140

CHECKING THE CLUTCH SPRINGS

The following procedure applies to all of the
clutch springs.
1. Check:
• Clutch spring
Damage Replace the clutch springs as a
set.
CLUTCH
Replace the clutch