4-78
MIDDLE GEAR
ENG
NOTE:
NOTE:
*****************************************************
a b
Before tightening the bolts:
1. Adjust the gear lash of the middle gear.
Refer to “GEAR BACKLASH ADJUST-
MENT”.
2. Check the operation of the middle driven
gear.
MIDDLE DRIVE GEAR SHIM SELECTION
Gear positioning is necessary when any of the
following parts are replaced.
Crankcase assembly
Middle gear assembly
1. Select:
Middle drive gear shim
1
Middle drive gear shim selection steps:
Position middle drive gear by using shims
1
with their respective thickness calculated
from information marked on crankcase, bear-
ing housing and drive gear end.
1
Shim thickness “A”
To find shim thickness “A” use following for-
mula:
Middle drive pinion gear shim thickness:
“A” = –
Where:
a
= a numeral (usually a decimal num-
ber) on the middle drive pinion gear is
either added to or subtracted from
“44”.
b
= a numeral (usually a decimal num-
ber) on the left crankcase specifies a
thickness of “43.5”.
Example:
1) If the middle drive pinion gear is marked
“+03”
a
is 44.03. . .
2) If the crankcase (left) is marked “43.45”
b
is 43.45. . .
3) Therefore, the shim thickness is 0.58 mm
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