Checking The Friction Plates; Checking The Clutch Plates - Yamaha MTN850-A 2017 Service Manual

3
8. Remove:
• Clutch boss nut
• Conical spring washer
• Washer
• Clutch boss
• Thrust plate
• Clutch housing
• Oil pump drive chain
EAS30348

CHECKING THE FRICTION PLATES

The following procedure applies to all of the fric-
tion plates.
1. Check:
• Friction plate 1, 2
Damage/wear  Replace the friction plates
as a set.
2. Measure:
• Friction plate 1, 2 thickness
Out of specification  Replace the friction
plates as a set.
TIP
Measure the friction plate at four places.
Friction plate 1 thickness
2.92–3.08 mm (0.115–0.121 in)
Wear limit
2.82 mm (0.111 in)
Friction plate 2 thickness
2.92–3.08 mm (0.115–0.121 in)
Wear limit
2.82 mm (0.111 in)
2
1
5-43
A. Friction plate 1
B. Friction plate 2
EAS30349

CHECKING THE CLUTCH PLATES

The following procedure applies to all of the
clutch plates.
1. Check:
• Clutch plate 1, 2
Damage  Replace the clutch plates as a
set.
2. Measure:
• Clutch plate 1, 2 thickness
(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 1 thickness
2.20–2.40 mm (0.087–0.094 in)
Warpage limit
0.10 mm (0.004 in)
Clutch plate 2 thickness
1.90–2.10 mm (0.075–0.083 in)
Warpage limit
0.10 mm (0.004 in)
3. Measure:
• Assembly width "a" of the friction plates and
clutch plates
CLUTCH