I had a nagging doubt about the gasket and oil ways, which I ignored and forgot about Will. I think you may be onto something. To answer your other questions: Presumably this problem only started after you rebuilt the top end and it was running well - leaky cylinder head joint not withstanding - bef...

Slipped the timing cover off, and I have attached a picture which shows an oil way which may have been partially covered by the gasket Will. Its impossible to be 100% sure, but I am 75% sure it was at least 30% covered by the gasket. I used a thick paper gasket, with wellseal and that stuff tends to...

It is an interesting thought though Will. I also converted the bike to tin chain guards along with fitting the correct tin timing cover, for which I had to make my own gasket. I think I was quite careful in making sure no holes were blocked by the new gasket, but you never know. Are there any obviou...

Although it did seem to take an age to start flowing, but once it started, it has been regular.

Oil is flowing nicely.

Evening all, I took a working w/ng and now have a non-working w/ng! On my journey I replaced the carb with a rebuilt 276. I also replaced the head with a head that I have been building up over the last year; the new head has new valve guides, valves and springs. All lapped in and sealing well as far...

Thank you Nev and Vincent. I have someone looking to see if they have some originals, otherwise, its out with the drill! Vincent, your pictures suggest the stud that the footrest support (5375-29) uses is also moved. But the document that Roger sent only shows the hole being moved, with a split bush...

and thank you Simon

That would have been so easy, but sadly not. I guess I either have to try and find some correct engine plates, and/or attempt the mods in GA83. That document is invaluable, thank you Roger.

I have removed the aluminium chain case cover and am currently offering up the replacement (and period correct) tin version, but although it very nearly fits , it would only do so if I enlarge the hole where the footrest bar comes through; which I don't want to do. As you can see from the pictures, ...