Yamaha YZ 2018 Series, Owner'S Service Manual

Page: 87 / 402

MAINTENANCE INTERVALS
3-1
EASB29B066
MAINTENANCE INTERVALS
EASB29B067
MAINTENANCE INTERVALS
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-
23.)
• 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
After
break-
in
Every
race
(about
2.5
hours)
Every
third
(about
7.5
hours)
Every
fifth
(about
12.5
hours)
As re-
quired
Remarks
VALVE
Check the valve
clearances
✓ ✓
The engine must be cold.
Inspect
✓
Check the valve seats and the
valve faces for wear.
Replace
✓
VALVE SPRING
Inspect
✓
Check the free length and the
tilt.
Replace
✓
VALVE LIFTER
Inspect
✓
Check for scratches and wear.
Replace
✓
CAMSHAFT Inspect the camshaft surface.
Inspect
✓
Inspect the decompression
system.
Replace
✓
CAMSHAFT
SPROCKET
Inspect
✓
Check for wear on the teeth
and for damage.
Replace
✓
PISTON
Inspect
✓
Inspect crack.
Clean
✓
Inspect carbon deposits and
eliminate them.
Replace
✓ ✓
Replace the piston, piston pin,
piston pin clip, and piston ring
all as a set.