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 will 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.