Yamaha YZ 2019 Series, Owner'S Service Manual, Page: 106 / 398

ENGINE
3-18
c. Check the number on the originally installed
adjusting pad.
TIP
•
The adjusting pad number “a” is indicated on
the top of the adjusting pad.
•
For the number on the originally installed ad-
justing pad, convert the last digit of adjusting
pad number as per the below table.
d. Select an adjusting pad with a proper valve
clearance from the adjusting pad selection ta-
ble.
TIP
•
There are 25 types of adjusting pads, ranging
from 1.20 mm (0.0472 in) to 2.40 mm (0.0945
in), in increments of 0.05 mm (0.0020 in).
• The field where the number on the originally in-
stalled adjusting pad and the measured valve
clearance intersect shows the adjusting pad
number to replace.
Example:
Pad number = 148
Rounded value = 150
e. Install the new adjusting pads “4” and the
valve lifters “5”.
NOTICE
ECA24310
Do not twist adjusting pads and valve lifters
forcibly during installation.
TIP
• Apply the engine oil on the valve lifters.
•
Apply molybdenum disulfide oil to the valve
stem ends.
•
Check that the valve lifters turn smoothly when
rotated with your finger.
•
Make sure that valve lifters and adjusting pads
are installed in place.
•
Make sure that adjusting pads are installed
with their numbers facing upward.
f. Install the camshafts (exhaust and intake).
Refer to “CAMSHAFT” on page 5-11.
g. Measure the valve clearance again.
h. If the valve clearance is out of specification,
repeat adjusting the valve clearance until it is
within specification.
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Last digit of pad num-
ber
Rounded valve
0, 1 or 2 0
4, 5 or 6 5
8 or 9 10
4
5