Yamaha WR450F(Y) 2009 Owner's Service Manual page 59

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MAINTENANCE INTERVALS FOR COMPETITION USE
Item
Replace
CAMSHAFTS
Inspect
Replace
CAMSHAFT SPROCKETS
Inspect
Replace
PISTON
Inspect
Clean
Replace
PISTON RING
Inspect
Replace
PISTON PIN
Inspect
Replace
CYLINDER HEAD
Inspect and clean
CYLINDER
Inspect and clean
Replace
CLUTCH
Inspect and adjust
Replace
TRANSMISSION
Inspect
Replace bearing
SHIFT FORK, SHIFT CAM,
GUIDE BAR
Inspect
ROTOR NUT
Retighten
MUFFLER
Inspect and retighten
Clean
Replace
CRANK
Inspect and clean
Every
After
third
Every
break-
race
(or 500
in
km)
3-4
Every
fifth (or
As re-
1,000
quired
km)
Inspect the camshaft surface.
Inspect the decompression system.
Check for wear on the teeth and for
damage.
Inspect crack.
Inspect carbon deposits and eliminate
them.
Check ring end gap.
Inspect carbon deposits and eliminate
them.
Change gasket.
Inspect score marks.
Inspect wear.
Inspect housing, friction plate, clutch
plate and spring.
Inspect wear.
Remarks

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