Yamaha TT-R90(S) Owner's Service Manual page 244

Å ı
CLUTCH
REMOVAL POINTS
Clutch boss
1. Remove:
Clutch boss nut 1
G
Lock washer 2
G
Clutch boss
G
NOTE:
Straighten the lock washer tab and use the
clutch holding tool 3 to hold the clutch boss.
Clutch holding tool:
YM-91042/90890-04086
Å For USA and CDN
ı Except for USA and CDN
Primary clutch
1. Remove:
Primary clutch nut 1
G
NOTE:
Loosen the nut while holding the magneto
rotor with the sheave holder 2.
Sheave holder:
YS-1880-A/90890-01701
INSPECTION
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:
Standard
2.7 ~ 2.9 mm
(0.106 ~ 0.114 in)
4 - 30
ENG
Limit
2.6 mm
(0.102 in)