HaaHaa Evil Twin
That bike use to be mine. I know it quite well. Yes your right was Oldham not Rochdale.
When I bought it it was a very sad Y1 LTD model. I sold it to Hoggy who did an amazing transformation. I can tell you it has a B1 engine in it which does significantly change the wiring. Beef joined this site and we offered to go round and help him sort the issues but he never took us up on the offer.
So there you go.
Officially you have a Y1 LTD (1983 on log book?) with mods.
Shout up if you need any help.