Yamaha XS850G Specifications Page 135

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Page view 134
CASEEXCHANGE
Whenthe exterior of the middlegearorfinal
gear
case
is
damagedandmustbereplaced,
payattentiontothenumbers scribed onthe
replacementcases.Followassemblyinstruc
-
tionsintheappropriatesectionof this manual.
9-1.
Middle
GearCaseReplacement
A.
Selection
of
Drive
PinionShim
Notethenumber scribed
on
the middle
gear
cases
(originalandreplacement).
Notetheoriginal drive shim thickness:
B.
Selection
of
DrivenPinionShim
Note the numberscribedonthemiddle
gear cases. Proceed
as
inabove steps
(
Page
122,Section6
-
2.
E).
Example: Replacement
.
.
.
. .
. .
.
.
79.73
Original
. .
. .
.
..
,
.
.
. .
.79.93
Originalshim
. . .
.
.
.
.0.10
rnm
Formulafordeterminingnewshim:
Originalshim
-
(newcasenumber
-
originalcasenumber)
Example:0.10-(79.73-79.93)
0.10-(-0.2.)
0.10
+
0.20
0.30
newshim
Notice that the subtractionof
a
negative
number-(-0.20)
is
thesameoperation
as
addingthatamount
as
a
positivenumber.
Usethisshimandthenormal instructions
forinstallation
of
middlegearcomponents
describedin
Page
119, Section 6-2.
C.
Final Inspection
Installgearassembliesaccording
of
appropriatesectionsofthismanual.
Checktoothcontact patterns andgear
lashbeforemountingnewassembly
on
machine.Referto6,Section6-2Dfor
toothcontactpatterninspection.
Page
121
9-2.
FinalGearCaseReplacement
Selectionofnewdrivepinionshim(s)and
thrustshim(s)
is
similar
to
middlegeardrive
pinionshimdetermination.
1.
Drive
pinion
ride
2.
Ring
gear
Page view 134
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