Yamaha YZ450FY 2009 Owner's Service Manual page 81

c. Measure the valve clearance "e" using a
feeler gauge "1".
Record the measured reading if the clearance
is incorrect.
5. Adjust:
• Valve clearance
Adjustment steps:
a. Remove the camshaft (intake and exhaust).
Refer to "CAMSHAFTS" section in the
CHAPTER 4.
b. Remove the valve lifters "1" and the pads
"2".
• Place a rag in the timing chain space to pre-
vent pads from falling into the crankcase.
• Identity each valve lifter and pad position very
carefully so that they can be reinstalled in
their original place.
c. Select the proper pad using the pad select-
ing table.
Pad range
No. 120– 1.20 mm–
No. 240 2.40 mm
The thickness "a" of each pad is indicated in
hundredths of millimeters on the pad upper sur-
face.
d. Round off the last digit of the installed pad
number to the nearest increment.
Last digit of pad
number
0, 1 or 2
4, 5 or 6
8 or 9
3-16
ENGINE
Pad Availability: 25
increments
Pads are available in
0.05 mm increments
Rounded valve
0
5
10