I would give your best efforts first to find who you believe is the registered owner, and then give your best efforts to have them get new registration. If you can do this AND persuade them to sign a transfer tax form (the well known carbon copy paper we all use when transferring motor vehicles), your problem is solved.
If the above does not work, then you will need to contact ICBC in North Van with a request for the name and address of the current registered owner. They will only give you this is you establish in a sworn statutory declaration how you became the "lawful" owner. Note, "lawful" does not mean "registered." "Lawful" means that you came to be in the possession of the motorcycle by purchasing it for value from a seller who purports to also be a lawful owner.
If I recall correctly, one of the issues you or a friend had some time ago was that the statutory declaration described how the bike was abandoned or something like that. Abandonment is a whole different area of law, and having something abandoned in your possession is not the same as being a "bona fide purchaser for value."
The above are just the first step. If you need help with the statutory declaration, come see me.
If you pay your dues to the Club ($25), I'll notarize the statutory declaration for free. Seeing as a notary charge is usually more than this, its a bargain.
Peace & Grease, Dennis