Yamaha 250GETO, Service Manual

Page: 194 / 293

LOWR
6-57 6S35H11
Lower unit
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.
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.
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.
Calculation formula:
Reverse gear shim thickness (T1) =
30.60 + F/100 – M1
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
6S35H11_061 05.9.5 14:15 Page 60