https://www.google.com.au/search?q=BSA+1971+72+A65+frame&espv=2&es_sm=93&tbm=isch&tbo=u&source=univ&sa=X&ei=PbZCU_2OEJGNkgW4l4HoBQ&ved=0CDMQsAQ&biw=1920&bih=989#q=norumph&tbm=isch&facrc=_&imgdii=_&imgrc=7kcN4NGMXBNvOM%253A%3Brtg4fQCuOl6tVM%3Bhttp%253A%252F%252Fwww.accessnorton.com%252Fdownload%252Ffile.php%253Favatar%253D2590_1369733505.jpg%3Bhttp%253A%252F%252Fwww.accessnorton.com%252Fnorumph-t19040.html%3B100%3B100
Now Thats a Cunning Idea . S. C. drive from Magneto drive presumeably . good enough for the electro Tri 750 , tho gives me the horrors there . electric start thru the Timimng pinnions & Keyways . Do they ever f*^# out ? ? ? looks like the primary Chaincase rear is BSA , A10 ? based . cut & weld job . Motor & Box closer than a Commando , wonder if a P11 case'd do . :?
You can see he has modded the rear subfame (Sic. ) at the top to angle fwd. the shocks , also lower dual mounts , for longer axle travel ?? as well as Yam style brace , seat post to rear side up rails . so mayve done a few other things too .
Looks to be Triumph Frame , rear mounts dont appear to match the A65 pictures I flogged & posted . :?
Not sure what this
is doing there , obviously a man of refined tastes and discernment .

:lol: