Yamaha RX10K, Supplementary Service Manual

Page: 137 / 523

2-11
VALVE CLEARANCE ADJUSTMENT
INSP
ADJ
NOTE:
NOTE:
NOTE:
S
Cover the timing chain opening with a rag to
prevent the valve pad from falling into the
crankcase.
S
Make a note of the position of each valve lifter
1 and valve pad 2 so that they can be
installed in the correct place.
S
Select the proper valve pad from the following
table.
Valve pad
thickness range
Available valve
pads
Nos.
120
X
240
1.20
X
2.40 mm
(0.047
X
0.095 in)
25 thicknesses
in 0.05 mm
(0.0020 in)
increments
S
The thickness
a
of each valve pad is marked
in hundredths of millimeters on the side that
touches the valve lifter.
S
Since valve pads of various sizes are originally
installed, the valve pad number must be
rounded in order to reach the closest equiva-
lent to the original.
S
Round off the original valve pad number ac-
cording to the following table.
Last digit Rounded value
0 or 2 0
5 5
8 10
EXAMPLE:
Original valve pad number = 148 (thickness
=1.48 mm (0.058 in))
Rounded value = 150
S
Locate the rounded number of the original
valve pad and the measured valve clearance
in the valve pad selection table. The point
where the column and row intersect is the new
valve pad number.
The new valve pad number is only an approxi-
mation. The valve clearance must be measured
again and the above steps should be repeated if
the measurement is still incorrect.