Yamaha 250GETO, Service Manual

Page: 163 / 293

6S35H11 6-26
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Shimming (regular rotation model)
Example:
If “T1” is 0.45 mm, then the forward gear shim
is 0.42 mm.
If “T1” is 0.40 mm, then the forward gear shim
is 0.38 mm.
Selecting the reverse gear shim
1. Measure the bearing
1
height (M2) as
shown.
NOTE:
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Select the shim thickness (T2) by using the
specified measurement(s) and the calcula-
tion formula.
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Measure the reverse gear at 4 points to find
the height average.
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Make of note the each measurement
numerical.
2. Calculate the forward gear shim thick-
ness (T1) as shown in the examples
below.
NOTE:
“F” is the deviation of the lower case dimen-
sion from standard. The “F” mark
a
is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the “F”
mark is unreadable, assume that “F” is zero
and check the backlash when the unit is
assembled.
Example:
If “M1” is 30.20 mm and “F” is (+5), then
T1 = 30.60 + (+5)/100 – 30.20 mm
= 30.60 + 0.05 – 30.20 mm
= 0.45 mm
If “M1” is 30.20 mm and “F” is (0), then
T1 = 30.60 + (0)/100 – 30.20 mm
= 30.60 + 0 – 30.20 mm
= 0.40 mm
3. Select the forward gear shim(s) (T1) as
follows.
Calculation formula:
Forward gear shim thickness (T1) =
30.60 + F/100 – M1
Shimming plate
2
: 90890-06701
Digital caliper
3
: 90890-06704
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
Calculated numeral
Rounded numeral
at 1/100th place
1, 2 0
3, 4, 5 2
6, 7, 8 5
9, 10 8
6S360186
T2
6S360187
M2
1
2
3
1
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