Yamaha 2011 WR450FA, Owner'S Service Manual

Page: 63 / 230

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