Yamaha WR450F(R) Owner's Service Manual page 402

CLUTCH
EC484500
Friction plate
1. Measure:
Friction plate thickness
G
Out of specification → Replace friction
plate as a set.
Measure at all four points.
Friction plate thickness:
2.92 ~ 3.08 mm
(0.115 ~ 0.121 in)
<Limit>: 2.8 mm (0.110 in)
EC484600
Clutch plate
1. Measure:
Clutch plate warpage
G
Out of specification → Replace clutch
plate as a set.
Use a surface plate 1 and thickness
gauge 2.
Warp limit:
0.1 mm (0.004 in)
Push lever
1. Inspect:
Push lever 1
G
Wear/damage → Replace.
EC484810
Push rod
1. Inspect:
Push rod 1 1
G
Bearing 2
G
Plain washer 3
G
Push rod 2 4
G
Ball 5
G
Wear/damage/bend → Replace.
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ENG