Phew " sounds like a big project, you can pick up a decent DT here for the money it"l cost to ship/restore that one, to get a V5 you"l need the old title/log book, if not , you"l need a dating cert,[ Aircooled Rd club do them ], mind you need a N.O.V.A. number when importing ,[ duties cert ],,
Decompressors are for big bore singles, [ or diesels ], XT500 had one, the DT400 ha an Automatic decomp, works of the kickstart via a cable,, i blanked it off .made little difference...