Well if this was me I would consider the inspection of the engine breather
Somewhere in the back of my head is ringing --- clogged breather .Causes pressure inside cases ejecting oil
Then I would touch the cylinder head bolts see if they are tightened with torque wrench
They do come loose sometimes
There exists a re tightening sequence according to a service bulletin involving loosening one at a time
triple g Gary has it --and then re tightening it.
Should them be loose .. Re tightening + Waiting can be an option
Having said that I have rarely solved a leak via re tightening ( On Motorcycles ) . But having worn old bikes ones get used to a little leaks
It comes with the hobby and is nowhere close to what Harley owners or Brit Bike owners are prepared to accept
for some time.
The golden rule " Dont repair things if it aint broken "
And for some vintage bikes if you mess it up and afterwards straightening your back you are trying to find a part that is nowhere to be found.
If driving with a ( Small ) leak there is always a next year to do it .If the Re tightening don't work .
edit :: Anything known about how many Miles it has traveled
