Yamaha YZ450F(S), Owner'S Service Manual

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INSP
ADJ
MAINTENANCE INTERVALS
EC300000
REGULAR INSPECTION AND ADJUSTMENTS
MAINTENANCE INTERVALS
The following schedule is intended as a general guide to maintenance and lubrication. Bear in mind
that such factors as weather, terrain, geographical location, and individual usage will alter the
required maintenance and lubrication intervals. If you are a doubt as to what intervals to follow in
maintaining and lubricating your machine, consult your Yamaha dealer.
Item
After
break-in
Every
race
Every
third
(or
500 km)
Every
fifth
(or
1,000 km)
As re-
quired
Remarks
ENGINE OIL
Replace
● ●
VALVES
Check the valve clearances
Inspect
Replace
● ●
●
●
The engine must be cold.
Check the valve seats
and valve stems for wear.
VALVE SPRINGS
Inspect
Replace
●
●
Check the free length and
the tilt.
VALVE LIFTERS
Inspect
Replace
●
●
Check for scratches and
wear.
CAMSHAFTS
Inspect
Replace
●
●
Inspect the camshaft sur-
face.
Inspect the decompres-
sion system
CAMSHAFT SPROCKETS
Inspect
Replace
●
●
Check for wear on the
teeth and for damage.
PISTON
Inspect
Clean
Replace
● ●
●
●
Inspect crack
Inspect carbon deposits
and eliminate them.
PISTON RING
Inspect
Replace
●
● ●
Check ring end gap
PISTON PIN
Inspect
Replace
●
●
CYLINDER HEAD
Inspect and clean
●
Inspect carbon deposits
and eliminate them.
Change gasket
CYLINDER
Inspect and clean
Replace
●
●
Inspect score marks
Inspect wear
CLUTCH
Inspect and adjust
Replace
● ●
●
Inspect housing, friction
plate, clutch plate and
spring
TRANSMISSION
Inspect
Replace bearing
●
●