Checking The Clutch Plates; Checking The Clutch Springs; Checking The Clutch Housing; Checking The Clutch Boss - Yamaha WR125R 2009 Service Manual

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 → Replace the clutch
plates as a set.
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
Clutch plate thickness
1.45–1.75 mm (0.057–0.069 in)
Warpage limit
0.20 mm (0.0079 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.
2. Measure:
• Clutch spring free length "a"
Out of specification → Replace the clutch
springs as a set.
Clutch spring free length
38.71 mm (1.52 in)
Minimum length
36.77 mm (1.45 in)
EAS25150

CHECKING THE CLUTCH HOUSING

1. Check:
• Clutch housing dogs "1"
Damage/pitting/wear → Deburr the clutch
housing dogs or replace the clutch housing.
TIP
Pitting on the clutch housing dogs will cause er-
ratic clutch operation.
2. Check:
• Bearing
Damage/wear → Replace the bearing and
clutch housing.
EAS25160

CHECKING THE CLUTCH BOSS

1. Check:
• Clutch boss splines
Damage/pitting/wear → Replace the clutch
boss.
TIP
Pitting on the clutch boss splines will cause er-
ratic clutch operation.
5-43
CLUTCH