Yamaha YZ250F(N)/LC Owner's Service Manual page 202

VALVE CLEARANCE INSPECTION AND ADJUSTMENT
Remove the decompression cable 1,
guide 2, bolt 3 and decompression shaft
4.
Remove the valve lifters 5 and the pads
6.
NOTE:
Place a rag in the timing chain space to
prevent pads from falling into the crank-
case.
Identity each valve lifter and pad position
very carefully so that they can be rein-
stalled in their original place.
Select the proper pad using the pad
selecting table.
Pad range
No. 120 1.20 mm
~
No. 240 2.40 mm
NOTE:
The thickness a of each pad is indicated in
hundreths of millimeters on the pad upper
surface.
Round off the last digit of the installed pad
number to the nearest increment.
Last digit of pad
number
0 or 2
5
8
EXAMPLE:
Installed pad number = 148
Rounded off value = 150
NOTE:
Pads can only be selected in 0.05 mm incre-
ments.
3 - 22
INSP
ADJ
Pad Availability:
25 increments
Pads are available in
~
0.05 mm increments
Rounded value
0
(NOT ROUNDED
OFF)
10