From the
service manual, that is indeed the case. Further, you need
to mark the positions
of the various gears attached to the mainshaft,
lest you disrupt the timing.
Is there a procesudure given for checking/setting the timing'from
scratch'? I am always wary of whether the setting in a second-hend
machine are spot-on, so I would want to check this, even if it takes a
long time.
-tony