Thanks for the extensive reply Don. Despite your "disclaimer", you seem to know a lot about the subject. I have little hope of finding answers to the questions you pose unless I find a single source which, or who, can give me a definitive answer. I am just not that knowledgeable. I have a T65 BSA in perfect running order. The value of the bike over a TR6R is in the correctly stamped matching number cases. I am looking for the "insurance" a set of correct Triumph cases, un-stamped with a vin number, can provide. Any leads on where I might find such a set of OIF cases appreciated. regards PhilHi philliplye, I'm far from expert, but a few thoughts come to mind. Are you just using cases? What about the metric crank bearing of later crank? You need to verify your parts will fit early case.
Another thought is the breather system on '69 is through timed breather driven by inlet cam. Will you cam accommodate the '69 system?
Also & this is important in my mind, the frame breather is tube welded to under side of back bone near front of gas tank. This location allows oil to run up back bone under certain conditions like hard braking down hill. Some liquid oil runs down breather tube with this happens. Not a problem on 1970 & new cases with primary breather as frame breather is T'd into breather hose & liquid simply runs into primary case & ultimately returns to frame reservoir.
However with timed breather on 1969 & earlier, it's hard for liquid oil to go backwards into engine. It certainly can to a small degree, but my feeling is you'll get a lot of liquid oil running out of breather at rear of fender.
Modifying early case to primary breather is another subject.
The trans shift cam index is different on '69 also. But that is easy. Use 1973 T140 plunger housing assembly.
In the end of the day I wonder if you'd be better off with '70 & newer 650 cases?
Classic British Spares has online parts books & shop manuals, plus tech pages.
This list is very complete. Vintage Bike Magazine » Parts Books
You're welcome 😊Thanks for getting back. I like the sound of your reply! Phil
You're welcome 😊
Regarding the response from DAVE M if you tap on the Tech Library it will take you to a large selection of parts books and tech information.
To clarify my response I was talking about a complete engine. IF on the other hand you have a set of 69 cases and want to put all the guts from a 72/73 engine in the earlier cases you will have a problem in your life.
Now would you clarify one thing for me. Are you saying your bike is a 1973 T65T BSA??
By the way the previously mentioned Tech Library has a 73 T65T BSA parts book.
As an edit I just checked and a T65T had the metric bearings so IF you are looking for a set of back up cases you need to obtain a set from late '71- 74. As far as finding a set of unstamped set will be difficult if VIN pad is stamped Triumph. If they are stamped BSA unless you have access to Divine intervention it ain't gonna happen.
A model that's interested me.73 T65
the order from the South Australia Police was around forty, not 200 plus as inferred in "history" books.
Mmmm ... from Don's posts, imho the '69 cases probably aren't what you want; they could be made to work to make a runner but, by definition, the changes necessary would simply turn the bike into a bitsa. Also, '69 cases have some features that make them unique - first year of Unified threadforms, last year of timed breather, etc. - so it might be a pity to deny 'em to someone trying to restore a '69 650?un-vin-stamped set of Triumph cases from an OIF
I don't think I will NEED the cases, but since any greater perceived value in the bike by a prospective buyer will depend on correctness, I look for an "insurance" set. And there is a 69 "un-vinned" set of cases available
That's because none of 'em are BSA part numbers ... apart from the "BSA" tank badges and the alternator rotor cover with "BSA" cast in, the bikes are entirely Triumph - mostly OIF TR6, plus some other Triumph bits.that parts book.
No pictures, just part numbers which do not appear in the "this Triumph part is the same as this BSA part" books that the dealers had.
If you're interested, lots of information on BritBike over the years - put "T65" in the Search and spend a few hours ... albeit some of the earlier stuff has been superseded by later research, much done by Australians; the South Australia Police connection is well-known.total production number of machines in the history books
I have never seen a reference to the South Australian Police usage.
Basically yes, but no drum-brake parts in the '73 750 Twin parts book; as I posted for Phil, the front end on all the early '73 650's sent to Oz is an unique combination from the Meriden parts bins and a few special bits. I haven't yet discovered why (if?) T65's to other destinations had the same front end, or why the following Oz TR6's had it, but they definitely did.The parts book thing I would use the 72 650 Triumph for engine pictures and the 73 750 Twin for the chassis bits pictures.