Yamaha YFM7FGPW Service Manual page 256

f
c. To find shim thickness "B" use the following
f
Middle driven pinion gear shim thickness
Where:
f = a numeral (usually a decimal number) on
NOTE:
After replacing any part in the middle driven
pinion gear assembly, the overall length of the
assembly will change. Therefore, be sure to
measure distance f to select the correct mid-
dle driven pinion gear shim thickness.
g = a numeral (usually a decimal number) on
h = a numeral (usually a decimal number) on
i = a numeral (usually a decimal number) on
j = a numeral (usually a decimal number) on
g
Example:
1) If the bearing housing is marked "+03",
2) If the driven pinion gear is marked "+0",
3) If the driven pinion gear is marked "–10",
4) If the left crankcase is marked "99.99",
h
5) If the right crankcase is marked "8.17",
6) Therefore, the shim thickness is 0.72 mm.
i
4 - 98
MIDDLE GEAR
formula:
"B" = f – g + h – i – j – 0.05
the bearing housing is either added to or
subtracted from "77.5"
the middle driven pinion gear is either
added to or subtracted from "49.0"
the middle driven pinion gear is either
added to or subtracted from "80.5"
the left crankcase specifies a thickness of
"99.98"
the right crankcase specifies a thickness
of "8.12"
..... f is 77.53
..... g is 49.0
..... h is 80.40
..... i is 99.99
..... j is 8.17
"B" = 77.53 – 49.0 + 80.40 – 99.99 – 8.17 –
0.05
= 0.72
ENG