Checking The Friction Plates; Checking The Clutch Plates - Yamaha YZF-R1B 2012 Service Manual

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7. Remove:
• Clutch boss nut
• Springs
• Clutch boss
• Pressure plate 2
• Conical spring washer
• Thrust washer
• Clutch housing assembly
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 → Replace the fric-
tion 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 (0.111 in)
A. Friction plate 1
B. Friction plate 2
email: info@motomatrix.co.uk
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.
Warpage limit
0.10 mm (0.0039 in)
3. Measure:
• assembly width "a" of the friction plates
and clutch plates
Out of specification → Adjust.
Assembly width
42.4–43.0 mm (1.67–1.69 in)
TIP
• Perform the thickness measurement without
applying the oil.
• This step should be performed only if the fric-
tion plates and clutch plates were replaced.
• To measure the total width of the friction
plates and clutch plates, combine 9 friction
plates and 8 clutch plates as shown.
5-63
CLUTCH