Yamaha YZ450FX 2021 Owner's Service Manual page 78

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No.
Item
• Check the coolant passages for
• Inspect carbon deposits and elim-
11 * Cylinder head
• Check for warpage, and replace
• Inspect score marks.
12 * Cylinder
• Inspect wear.
• Check the engine oil amount.
13
Engine oil
• Replace.
14
Oil filter element
• Replace.
15 * Oil strainer
• Clean.
• Inspect housing, friction plate,
16 * Clutch
• Replace.
• Inspect.
17 * Transmission
• Replace bearings.
• Inspect wear.
Shift fork, shift cam,
18 *
guide bar
19 * Nut (generator rotor)
• Check for tightening torques.
• Check for exhaust leaks, and
• Clean.
Exhaust pipe,
20 *
silencer, protector
• Replace fiver.
21 * Crankshaft
• Inspect and clean.
22 * Throttle body
• Inspect.
• Clean and lubricate.
23
Air filter
• Replace.
• Check the electrodes and the ter-
24
Spark plug
• Replace.
• Check coolant level and leakage.
• Check radiator cap operation.
25 * Cooling system
• Check radiator cap attached.
• Change the coolant.
• Inspect hoses.
26 * Engine guard
• Replace.
27 * Frame
• Clean and inspect.
28 * Fuel tank, fuel pump
• Inspect.
• Inspect.
29 * Fuel hose
• Replace.
Routine
corrosion.
inate them.
the gasket.
clutch plate and spring.
tightening torques.
(When the exhaust sound
becomes louder or when a perfor-
mance drop is felt.)
minals for wear.
MAINTENANCE INTERVALS
Every race
Every third
After
(about
race (about
break-in
2.5 hours)
7.5 hours)
Every two years
Every four years
3-2
Every fifth
race (about
As required
12.5 hours)

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