Yamaha 250GETO Service Manual page 194

LOWR
2. Calculate the reverse 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.
Calculation formula:
Reverse gear shim thickness (T1) =
30.60 + F/100 – M1
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 reverse gear shim(s) (T1) as
follows.
Calculated numeral
at 1/100th place
1, 2
3, 4, 5
6, 7, 8
9, 10
6-57
Lower unit
Rounded numeral
0
2
5
8
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
Example:
If "T1" is 0.45 mm, then the reverse gear shim
is 0.42 mm.
If "T1" is 0.40 mm, then the reverse gear shim
is 0.38 mm.
6S35H11