1964 Primary Cover Leak

I have a friend who has a 64 Bonneville. It leaks pretty badly from the primary cover at the top through the gasket, even when sat idling it almost squirts out. I have attached a photo where the oil is coming through.

I don't know a lot about these bikes. Inside the primary there should be very little oil, just enough to lube things up, unlike Harleys that are bathed on primary oil?

Just trying to understand how this works. If yes, then what can I be looking for that could be causing the primary to be filling up like this. A leaking crank seal, something else?

Also, can the gaiters be squeezed over from the bottom over the fender mounts, is there enough to stretch it over or is it forks off?

Thank you.

 

Took the cover off, that corner of the gasket was perished. I noticed the tiny bit of oil in there was severely mixed with fuel. The area where the oil/petrol was seeping out corresponded with a small hole in the crank case, I assume this is for misting the chain, but not only misting the chain it was spraying up and through the perished gasket.

Which confused me as I thought older Bonnies used a seperate primary oil, with no small holes in the crankcase to share the motor oil?

 

As it happens I replaced the gasket last week. Leaking is resolved, however the concern with so much fuel in the primary remains. There was also a very fuel mixed oil in the crankcase too. Need to investigate this further. It was all drained, flushed and refilled again with 20/50. Will check the oil again in a week.

The primary chain tensioner was broken so it was good that the primary cover was removed. With that replaced, the shifting is significantly quieter!!