Yamaha YZ450F, 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
The engine must be cold.
Check the valve seats
and valve stems for wear.
Check the valve clearances
Inspect
Replace
VALVE SPRINGS
Check the free length and
the tilt.
Inspect
Replace
VALVE LIFTERS
Check for scratches and
wear.
Inspect
Replace
CAMSHAFTS Inspect the camshaft sur-
face.
Inspect the decompres-
sion system
Inspect
Replace
CAMSHAFT SPROCKETS
Check for wear on the
teeth and for damage.
Inspect
Replace
PISTON
Inspect crack
Inspect carbon deposits
and eliminate them.
Inspect
Clean
Replace
PISTON RING
Check ring end gap Inspect
Replace
PISTON PIN
Inspect
Replace
CYLINDER HEAD Inspect carbon deposits
and eliminate them.
Change gasket
Inspect and clean
CYLINDER
Inspect and clean Inspect score marks
Inspect wear
Replace
CLUTCH
Inspect housing, friction
plate, clutch plate and
spring
Inspect and adjust
Replace
TRANSMISSION
Inspect
Replace bearing