Yamaha YZ450FT Owner's Service Manual page 158

È É
CLUTCH
EC493000
REMOVAL POINTS
EC483211
Clutch boss
1. Remove:
• Nut 1
• Lock washer 2
• Clutch boss 3
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
È For USA and CDN
É Except for USA and CDN
EC494000
INSPECTION
EC484100
Clutch housing and boss
1. Inspect:
• Clutch housing 1
Cracks/wear/damage → Replace.
• Clutch boss 2
Scoring/wear/damage → Replace.
EC484201
Primary driven gear
1. Check:
• Circumferential play
Free play exists → Replace.
• Gear teeth a
Wear/damage → Replace.
EC484400
Clutch spring
1. Measure:
• Clutch spring free length a
Out of specification → Replace springs
as a set.
Clutch spring free length:
Standard
47.8 mm (1.88 in)
4 - 50
ENG
<Limit>
46.8 mm (1.84 in)