Yamaha YZ250F(R) Owner's Service Manual page 79

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VALVE CLEARANCE INSPECTION AND ADJUSTMENT
Remove the valve lifters 1 and the pads
2.
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, 1 or 2
4, 5 or 6
8 or 9
EXAMPLE:
Installed pad number = 148
Rounded off value = 150
NOTE:
Pads can only be selected in 0.05 mm incre-
ments.
Locate the rounded-off value and the mea-
sured valve clearance in the chart "PAD
SELECTION TABLE". The field where
these two coordinates intersect shows the
new pad number to use.
NOTE:
Use the new pad number only as a guide
when verifying the valve clearance adjust-
ment.
3 - 21
INSP
ADJ
Pad Availability:
25 increments
Pads are available in
0.05 mm increments
Rounded value
0
5
10

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