all you can do is either replace the lockset for a new one or get a new key cut for the old one you will have to send the lock off to keys galore for this in london ,also you will have to buy a non chipped cdi unit form electrexworlduk they have a website you will need to quote the paret number off the old cdi thats behind the inner legshield it will be something like aci100 or a similar number.
adam bike doctor
July 2010