Which sub model is this 1973 Commando

Gear box matches tag and engine .
212352 with a trailing S
 

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L.A.B. said:
It generally means nothing outside the factory.
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I was just reading through old posts and discovered your earlier posts on the subject. Wondering if anyone has compiled any sort of listing that might allow speculation about what factory change prompted what letter.
 
LPCityNorton said:
For what it's worth, my 750 Roadster, built in the same month as yours (Oct. 72) also has the "S" stamped after the serial number on top of the gearbox.
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Just a guess, but I'm assuming a batch indicator - maybe from the foundry or machine shop that took them from a raw casting to a machined gearbox shell.

I'm working on one right now in the same range that has a "W" and it was clearly stamped at a different time from the serial number. Many have no letter. There are numbers all over the bikes that have no useful meaning outside the factory, and most are not consistently there.

Two I'm trying to figure out are the 001xx number stamped into the drive side of the headstock on many frames. Also the "F" or no "F" in the 850 frame number stamped into the timing side of the headstock on 850 frames. There are theories on both but so far, no real proof or enough evidence to say.
 
TJBaker57 said:
I was just reading through old posts and discovered your earlier posts on the subject. Wondering if anyone has compiled any sort of listing that might allow speculation about what factory change prompted what letter.
Click to expand...
I don't think the reason for any of the gearbox letters is known so that could prove difficult.
 
I have my 72 750, as it turns out, torn down now. I want to replace my headlamp bucket. It has a single hole in the back where the wiring loom entered. I see that later they added the two additional holes for the 2 handlebar switch looms for cleaner look. . The handle bar switches that were on this bike were patched directly into the the main loom which is being replaced as its hacked to death. I'm guessing then there must be a different headlamp loom exiting the shell to accommodate all the additional wiring from the switches. My parts book only shows the single wire hole version of the shell. Has anyone migrate from the single to triple hole shell?
 
Daytonachuff said:
I have my 72 750, as it turns out, torn down now. I want to replace my headlamp bucket. It has a single hole in the back where the wiring loom entered. I see that later they added the two additional holes for the 2 handlebar switch looms for cleaner look. . The handle bar switches that were on this bike were patched directly into the the main loom which is being replaced as its hacked to death. I'm guessing then there must be a different headlamp loom exiting the shell to accommodate all the additional wiring from the switches. My parts book only shows the single wire hole version of the shell. Has anyone migrate from the single to triple hole shell?
Click to expand...
Have you gotten a copy of the service manual? It will answer all those questions and so much more, including the wiring connection points, and routing. It is downloadable for free…
 

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