Yamaha YZ450F(Y), Owner'S Manual

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MAINTENANCE INTERVALS
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 ● ● The engine must be cold.
Inspect ● Check the valve seats and valve
stems for wear.
Replace ●
VALVE SPRINGS
Inspect ● Check the free length and the tilt.
Replace ●
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 ●
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.
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