Selecting The Forward Gear Shim - Yamaha 250GETO Service Manual

LOWR
5. Calculate the pinion shim thickness (T3)
as shown in the examples below.
NOTE:
"P" is the deviation of the lower case dimen-
sion from standard. The "P" mark a is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the "P"
mark is unreadable, assume that "P" is zero
and check the backlash when the unit is
assembled.
Calculation formula:
Pinion shim thickness (T3) =
82.00 + P/100 – M3 – M4
Example:
If "M3" is 50.75 mm and "M4" is 30.57 mm
and "P" is (+ 2), then
T3 = 82.00 + (+ 2)/100 – 50.75 – 30.57 mm
= 82.00 + 0.02 – 50.75 – 30.57 mm
= 0.70 mm
6. Select the pinion shim(s) (T3) as follows.
Calculated numeral
at 1/100th place
1, 2
3, 4, 5
6, 7, 8
9, 10
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
6-25
Lower unit
Rounded numeral
0
2
5
8
Example:
If "T3" is 0.70 mm, then the pinion shim is
0.68 mm.
If "T3" is 0.74 mm, then the pinion shim is
0.72 mm.

Selecting the forward gear shim

1. Turn the thrust bearing 1 2 or 3 times to
seat the roller bearing outer race 2, and
then measure the bearing height (M1) as
shown.
T1
1
3
NOTE:
9 Select the shim thickness (T1) by using the
specified measurement(s) and the calcula-
tion formula.
9 Measure the thrust bearing to seat the roller
bearing at 4 points to find the height aver-
age.
9 Make of note the each measurement
numerical.
Digital caliper 3: 90890-06704
6S360180
1
M1
2
6S360185
6S35H11