Hi;
  Well, I'm the proud new owner of an '84 Westy.
It has it's original engine and 4 speed tranny with
140K miles on it.
  Vehicle seems to run good so far (drove it home
300 miles from point of puchase) except for the
loud rumbling noise it makes whenever it is not
accelerating. It will do this whether or not the clutch
is depressed. It will stop doing this with even the
slightest amount of acceleration.
  Any thoughts on this would be appreciated.

Thanks;
  Rod