Checking The Clutch Plates; Checking The Clutch Springs; Checking The Clutch Housing; Checking The Clutch Boss - Yamaha 2009 YFM25RY Service Manual

TIP
Measure the friction plate at four places.
Friction plate thickness
2.90–3.10 mm (0.114–0.122 in)
Wear limit
2.80 mm (0.110 in)
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
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
47.80 mm (1.88 in)
Minimum length
46.50 mm (1.83 in)
EAS25150

CHECKING THE CLUTCH HOUSING

1. Check:
• Clutch housing dogs
Damage/pitting/wear → Deburr the clutch
housing dogs or replace the clutch hous-
ing.
TIP
Pitting on the clutch housing dogs will cause
erratic clutch operation.
EAS25160

CHECKING THE CLUTCH BOSS

1. Check:
• Clutch boss splines
Damage/pitting/wear → Replace the
clutch boss.
5-33
CLUTCH