Maintenance Intervals - Yamaha YZ450F Owner's Service Manual

MAINTENANCE INTERVALS

EASB111064
MAINTENANCE INTERVALS EASB111065
ECA@
NOTICE
• After a break-in or before each race, always check the points shown in "TORQUE-CHECK
POINTS" for tightening torques and retighten them. ("TORQUE-CHECK POINTS" on page 1-
24.)
• Periodic inspection is essential in making full use of the machine performance. The life of
parts varies significantly according to the environment in which the machine runs (e.g., rain,
dirt, etc.). Therefore, earlier inspection is required by reference to the list below.
ITEM
VALVE
Check the valve
clearances
Inspect
Replace
VALVE SPRING
Inspect
Replace
VALVE LIFTER
Inspect
Replace
CAMSHAFT
Inspect
Replace
CAMSHAFT
SPROCKET
Inspect
Replace
PISTON
Inspect
Clean
Replace
Every Every
After race third
break- (about (about
in 2.5 7.5
hours) hours)
MAINTENANCE INTERVALS
Every
fifth
As re-
(about
quired
12.5
hours)
3-1
Remarks
The engine must be cold.
Check the valve seats and the
valve faces for wear.
Check the free length and the
tilt.
Check for scratches and wear.
Inspect the camshaft surface.
Inspect the decompression
system.
Check for wear on the teeth
and for damage.
Inspect crack.
Inspect carbon deposits and
eliminate them.
Replace the piston, piston pin,
piston pin clip, and piston ring
all as a set.