Yamaha YFM250XL(C) Service Manual page 200

6
MIDDLE GEAR SERVICE
Thickness (mm)
Because shims can only be selected in 0.05
mm increments, round off hundredths digit
and select appropriate shim(s).
Hundredths
0, 1
2, 3
4, 5, 6
7, 8
9
In the example above, the calculated shim
thickness is 0.51 mm. The chart instructs
you, however, to round off the 1 to 0, then
shim thickness is 0.50 mm.
Shim selection Î
When the crankcase, driven pinion gear,
reverse gear, bearing housing and/or mid-
dle driven shaft are replaced, be sure to
adjust the middle driven shaft shim Î.
To find reverse gear shim thickness "D"
use following formula:
Middle driven gear thickness:
Î = j – c – e – ı – k – l – 0.25
j= The stamped number on the bearing
hauging is substracted from "1".
c= The stamped number on the crankcase
is added to from "110".
e= Bearing (driven pinion gear) width
"13.00".
k= The stamped number on the driven
pinion gear (forward gear) is sub-
stracted from "14.5".
l= The stamped number on the middle
driven shaft is either added to or sub-
stracted from "80.5".
6 - 14
DRIV
Reverse gear shim
0.15 0.40
0.20 0.50
0.30
Round value
0
3
5
8
10