Yamaha 2004 YXR660 Service Manual page 219

MIDDLE GEAR
Example:
1) If the bearing housing is marked "+02",
...... a is 7.52,
2) b is 17
3) c is 55
4) If the crankcase (left) is marked "64.98",
...... d is 64.98.
5) Therefore, the shim thickness is 0.50 mm.
A = 7.52 + 64.98 – 17 – 55
= 0.50
6) Round off hundredths digit and select
appropriate shim(s).
In the example above, the calculated shim
thickness is 0.50 mm. The chart instructs
you, however, to round off 0 to 0.
Hundredths
0, 1, 2
3, 4, 5, 6, 7
8, 9
Shims are supplied in the following thickness.
Middle drive pinion gear shim
Thickness (mm)
c. To find shim thickness "B" use the following
formula:
Middle driven pinion gear shim thickness
"B" = e – f + g – h + i – 0.05
Where:
e = a numeral (usually a decimal number) on
the bearing housing is either added to or
subtracted from "76".
f = a numeral (usually a decimal number) on
the middle driven pinion gear is either
added to or subtracted from "60".
4 - 93
ENG
Round value
0
5
10
0.10 0.30
0.15 0.40
0.20 0.50