Yamaha YFZ450S 2003 Service Manual page 316

SWINGARM AND DRIVE CHAIN
2. Check:
_
Do not attempt to straighten a bent pivot
shaft.
3. Clean:
4. Check:
7 - 66
• pivot shaft
Roll the axle on a flat surface.
Bends → Replace.
WARNING
• pivot shaft
• spacer
• bearings
• bushings
Recommended cleaning solvent
Kerosene
• oil seals
Damage/wear → Replace.
• bearings
• bushings
Damage/pitting → Replace.
CHAS