Ducati 750 Sport Owner's Manual page 37

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Fitting the countershaft
The countershaft must be fitted in its seat
taking care to position the thrust washer
between the bearing and fourth speed
gear. Another thrust washer must be
placed in the upper portion of the shaft to
act as a shim against the bearing of the
clutch side half-crankcase and the first
gear.
Fitting the speed control forks
This figure ilustrates how the forks are
fitted. These
forks must be fitted before
the gear control drum.
Fitting the gear drum
The gear drum must be fitted in its seat,
taking care to position the thrust washer in
the stem. Another thrust washer must
then be placed in the upper portion of the
drum and wil rest against the clutch side
half-crankcase. Before positioning the
drum stem in its seat make sure that the
rubber seal ring is in good condition. After
fitting the drum, make sure that the fork
guidepins are in the proper drum cams. .