Yamaha YZ450F(S) Owner's Service Manual page 338

Å ı
CLUTCH
EC493000
REMOVAL POINTS
EC483211
Clutch boss
1. Remove:
Nut 1
G
Lock washer 2
G
Clutch boss 3
G
NOTE:
Straighten the lock washer tab and use the
clutch holding tool 4 to hold the clutch boss.
Clutch holding tool:
YM-91042/90890-04086
Å For USA and CDN
ı Except for USA and CDN
EC494000
INSPECTION
EC484100
Clutch housing and boss
1. Inspect:
Clutch housing 1
G
Cracks/wear/damage → Replace.
Clutch boss 2
G
Scoring/wear/damage → Replace.
EC484201
Primary driven gear
1. Check:
Circumferential play
G
Free play exists → Replace.
Gear teeth a
G
Wear/damage → Replace.
EC484400
Clutch spring
1. Measure:
Clutch spring free length a
G
Out of specification → Replace springs
as a set.
Clutch spring free length:
Standard
50 mm (1.97 in)
4 - 50
ENG
<Limit>
49 mm (1.93 in)