Yamaha YFM660FP Service Manual page 236

MIDDLE GEAR
●
To find shim thickness "B" use the following
formula:
Middle driven pinion gear shim thick-
ness:
"B" = e – f + g – h + i – 0.05
Where:
e = a numeral (usually a decimal number)
on the bearing housing is either added
to or subtracted from "76".
f = a numeral (usually a decimal number)
on the middle driven pinion gear is
either added to or subtracted from "60".
g = a numeral (usually a decimal number)
on the middle driven pinion gear is
either added to or subtracted from
"80.5".
h = a numeral (usually a decimal number)
on the left crankcase specifies a thick-
ness of "97.29".
i = a numeral (usually a decimal number)
on the right crankcase specifies a
thickness of "1.67".
Example:
1) If the bearing housing is marked "–06",
..... e is 75.94.
2) If the driven pinion gear is marked "+0",
..... f is 60.00.
3) If the driven pinion gear is marked "–13",
..... g is 80.37.
4) If the crankcase (left) is marked "97.29",
..... h is 97.29.
5) If the crankcase (right) is marked "1.67",
..... i is 1.67.
6) Therefore, the shim thickness is 0.64 mm.
B = 75.94 – 60.00 + 80.37 – 97.29 + 1.67
– 0.05 = 0.64
4 - 93
ENG