Yamaha YFM660FS, Supplementary Service Manual

Page: 305 / 478

4 - 92
ENG
MIDDLE GEAR
Where:
a
= a numeral (usually a decimal number)
on the bearing housing is either added
to or subtracted from “7.5”.
b
= 17.0
c
= 55.0
d
= a numeral (usually a decimal number)
on the right crankcase specifies a
thickness of “64.98”.
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 (right) 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.
Shims are supplied in the following thickness.
Hundredths Round value
0, 1, 2 0
3, 4, 5, 6, 7 5
8, 9 10
Middle drive pinion gear shim
Thickness (mm)
0.10 0.30
0.15 0.40
0.20 0.50