Yamaha YFM4FAR Service Manual page 212

MIDDLE GEAR
Example:
1) If the bearing housing is marked "+04",
...... a is 10.54.
2) b is 55
3) If the crankcase (right) is marked "66.03",
...... c is 66.03.
4) Therefore, the shim thickness is 0.47 mm.
A = 66.03 – 10.54 – 55
= 0.49
5) Round off hundredths digit and select
appropriate shim(s).
In the example above, the calculated shim
thickness is 0.49 mm. The chart instructs
you, however, to round off 9 to 10.
Hundredths
0, 1, 2
3, 4, 5, 6, 7
8, 9
Shims are
thicknesses.
Middle drive pinion gear shim
Thickness (mm)
G
To find shim thickness "B" use the following
formula:
Middle driven
thickness:
"B" = d – e + f – g – 0.05
4 - 82
ENG
Round value
0
5
10
supplied in the
0.10
0.15
0.20
pinion gear
following
0.30
0.40
0.50
shim