Yamaha 50G Service Manual page 117

LOWR
SHIM SELECTION
(EXCEPT FOR USA AND CANADA)
90890-06701
90890-06704
NOTE:
Use a minimum number of shims to
obtain the thickness equal or nearly equal
to the calculation.
Install the shims with the thicker one on
the outer side.
Reverse gear shim
1. Find reverse gear shim thickness (T2)
by selecting shims until the specified
measurement (M) with the special tool
is obtained.
NOTE:
Be sure to remove the O-ring from under
the thrust washer.
2. Using a digital caliper at the specified
measurement (M) established above,
measure the distance between the
washer top and special tool top as
shown.
Shim thickness (T2)=
50 hp:
M – 25.40 mm – R/100 mm
60, 70 hp
M – 28.00 mm – R/100 mm
75 ~ 90 hp:
M – 26.00 mm – R/100 mm
Shimming plate:
90890-06701
Digital caliper:
90890-06704
3. R is the deviation of the lower case
dimension from standard. It is stamped
on the trim tab mounting surface of the
lower case in 0.01 mm units. If the R
mark is missing or unreadable, assume
an R mark of "0" and check the back-
lash when the unit is assembled.
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E