Untimely Jota oil leak

[Grant]

The rubber cam cover gasket can compress, and some pattern parts are thinner than standard which leaves the cover hard against the head but the rubber is not fully compressed.

I fit new rubber gaskets and Evostik them in place.

Also make sure the copper washers are present and in good condition. If they get too thin the same sort of problem arises.
I fit thick aluminium washers when I rebuild the engines as I haven't found a source of the correct dimension copper ones anywhere. They are much thicker than ordinary washers that ID and OD.

 

[mauricejota7604]

I wanted to bring my Jota to Baskerville but it has developed an oil leak.
The oil sits on top of the forward / centre of the lowest fin on the barrel.  It seems to be coming along the channel that passes towards the rear of the barrel i.e. from inside.  I am sure it is not coming from the cam cover, the chain tensioner, or the base or head gaskets.
Has anyone experienced this before? Yep my red Orphan 3C gets damp in there I think mine maybe a little porosity in the barrell near the camchain tunnel.