Yamaha RS90GTZ Service Manual page 36

VALVE CLEARANCE ADJUSTMENT
2-13
• Select the proper valve pad from the follow-
ing table.
Valve pad
thickness range
1.20 ~
Nos. 2.40 mm
120 ~ 240 (0.047 ~
0.094 in)
TIP
• The thickness of each valve pad is marked
in hundredths of millimeters on the side that
touches the valve lifter.
• Since valve pads of various sizes are origi-
nally installed, the valve pad number must be
rounded in order to reach the closest equiva-
lent to the original.
• Round off the original valve pad number
according to the following table.
Last digit
0 or 2
5
8
EXAMPLE:
Original valve pad number = 148 (thickness =
1.48 mm (0.058 in))
Rounded value = 150
• 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.
TIP
The new valve pad number is only an approxi-
mation. The valve clearance must be mea-
sured again and the above steps should be
repeated if the measurement is still incorrect.
INSP
ADJ
Available valve pads
25 thicknesses in
0.05 mm (0.0020 in)
increments
Rounded value
0
5
10