July 29th, 2015, 01:09 PM
Joined: Nov 2001
From: Ely, England
he should be able to give it to an engineer who will put an inset in for you. failing that you could have a bung made as a one off by an engineer?
I have stainless ones from the earlier engines up to 2004. they are 22mm to the outside diameter of the thread. they could easily be remachined all the way down ro 19-20mm. the inside hole for the strainer would need opening a little. the earlier bikes had a 12.5mm strainer diameter and yours is up at about 14mm I think?