Help w/ I.D. / Model and Year?

Hi, I'm new on here.Just bought a coupe frames w/ motors. One frame was modified or damaged (back cut off) w/ a good motor. I have it running. Both cylinders have 160 psi pressure and it roared to life with just a few kicks. One minor fin piece missing but other than that, it's perfect. The other frame has a blown motor, rod sticking through the case, jug separated from its bolts. Somebody really did a number on it. This frame is perfect so I plan to transfer the good motor from the bad frame, #20M3S/131917 into frame #138463. I'd like to understand what these were originally so I have an idea what I want to build today. I'd like to preserve some of their history. Can anyone help me figure out what the frame and motor started their lives as?

http://www.motos-anglaises.com/motos/no ... histo.html

Hope this help.
Ciao
Piero

Welcome,

Jaxson said:

This frame is perfect so I plan to transfer the good motor from the bad frame, #20M3S/131917 into frame #138463. I'd like to understand what these were originally so I have an idea what I want to build today. I'd like to preserve some of their history.

Click to expand...

20M3S/131917 was almost certainly a 1969 750 'S' Type, as that would have been the only Commando model built with the 20M3S (points on camshaft) specification engine at that time.

By the time 138463 was built, (mid-1970) 'S' type production had ended, so that could have been a Fastback, or, for the US market, more likely to have been a Roadster.

You could ask the library/records departments of either the UK NOC or VMCC as both clubs have access to the surviving factory records (they will probably charge this service if they find anything).

http://www.vmccshop.net/c/590/library-services
http://www.nortonownersclub.org/records-dating