Yamaha YFM450FAT, Supplementary Service Manual

Page: 51 / 73

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DRIV
REAR CONSTANT VELOCITY JOINTS, FINAL DRIVE
GEAR AND DRIVE SHAFT
POSITIONING THE FINAL DRIVE PINION
GEAR
When the final drive pinion gear, ring gear,
final drive gear case and/or ring gear bearing
housing are replaced, be sure to adjust the
positions of the final drive pinion gear using
shim.
Final drive pinion gear shim selection
1. Select:
• final drive pinion gear shim
1
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a. To find the final drive pinion gear shim thick-
ness “A”, use the following formula.
a
= 76.0 mm
b
= a numeral (usually a decimal number) on
the final drive gear case either added to or
subtracted from “75”
Example:
1)
a
= 76
2) If “51” is stamped on the final drive gear
case,
b
= 75 + 0.51 = 75.51
3) Therefore, “A” is 0.49.
“A” = 76 – 75.51
= 0.49
4) Round off the hundredth digit and select the
appropriate shim.
In the example above, the calculated num-
ber is 0.49. The chart instructs you to round
off 9 to 10 at the hundredth place. Thus, the
shim thickness is 0.50 mm.
Final drive pinion gear shim thickness
“A” =
a
–
b
Hundredths Rounded value
0, 1, 2 0
3, 4, 5, 6, 7 5
8, 9 10
“A”
1
a b
b