Yamaha F200B Service Manual page 470

LOWR
b
0.20
0
–0.20
–0.40
–0.60
0 5
È (1/100 mm)
È
0 5
É
–0.43 –0.40 –0.37
È Backlash measurement (BL1)
É Shim thickness adjustment
TIP:
• If the shim thickness adjustment value is
positive, the current shim thickness must
be increased by that amount and, if the
value is negative, the current shim thick-
ness must be decreased by that amount.
• The gray-colored area on the selection
chart indicates the range of the specified
backlash. Shimming is not required if the
measured backlash is within the gray-col-
ored area.
• The values for the shim thickness adjust-
ments specified in the selection chart are
intended to obtain the median value within
the range for the specified reverse gear
backlash.
• The table that follows the selection chart
shows the shim thickness adjustments for
the points marked on the chart.
5. Calculate the new reverse gear shim (T1)
thickness.
Calculation formula:
New reverse gear shim (T1) thickness =
Current reverse gear shim thickness +
Shim thickness adjustment
Example:
Use the following formula when the shim
thickness adjustment value is negative.
8-107
Lower unit
90 95 100
a
10 95 100
0.28
Current reverse gear shim thickness = 0.65
mm
Shim thickness adjustment = –0.23 mm
New reverse gear shim (T1) thickness = 0.65
mm + (–0.23) mm = 0.42 mm
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
mm
TIP:
• Use the least number of shims to obtain the
required shim thickness.
• If the calculated shim thickness cannot be
obtained with a combination of the avail-
able shims, increase the shim thickness by
0.01 mm.
6. Install the determined reverse gear
shims (T1) and retainer. See steps 3 and
4 in "Assembling the lower case" (8-83).