Mark i'm confused
- Thread starter olympus
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Correct (750 MkIV).
I think you are confusing 750 mark numbers with 850 mark numbers?
http://www.gregmarsh.com/MC/CommandoID.aspx
If the gearbox serial number matches the engine and frame number then it's the correct gearbox, so you can consider it to be a 750 MkIV gearbox.
Same can be said for the swingarm (although it's the same part from '68 to '72).
That's because OB mean 850 Mk3.
Technically, it could be said that a 750 MkIV swingarm is "pre 850 Mk3" as 750 MkIV is '72 and 850 Mk3 is '75-.
Across the top lug, normally.
Example (850 Mk3 gearbox):
https://www.accessnorton.com/Norton...54-check-you-numbers.24056/page-2#post-354991
If there's an additional letter stamp it's a factory code which can be ignored and a '72 box won't have those circular limit stamp marks.
You may also find a cast-in number "040122". That's the shell casting/foundry number so once again, it can be ignored.
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marshg246
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I'm trying to do that, look here: http://www.gregmarsh.com/MC/CommandoID.aspx I would like to add much more detail, but I'm only compiling what I've found and what people tell me.
olympus
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I look forward to seeing this very much
.... Coming from Triumph rebuilds over many years , I do find the structure of the Mk's across the cc, model, year somewhat "confusing" ....apologise to the Norton Stobart's So a master doc would be very helpful
I look forward to seeing this very much
http://www.gregmarsh.com/MC/CommandoID.aspx
Greg's page just about nails it as far as general production models are concerned and the most accurate and complete list there is in my opinion at this time.
All that's really missing is limited production models such as Production Racers, Interpols etc.
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marshg246
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I don't have his publications - if someone does, please bounce the info verses my page and tell me where you see differences. You won't hurt my feelings - I'm just gathering data, checking it as best I can, and posting it for the good of all.
I added a little from Mick Duckworth's book recently.
grandpaul
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They're all just bodywork variations, with an occasional set of clip ons and rearsets...
grandpaul
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MkII, unless Fastback is MkIII for that ser# range
Could be either Roadster MkII, Fastback MkIII, 1st. model of Hi-Rider, Fastback LR or (only model of) 750 SS.
Street Scrambler (750 SS) production only lasted a few months during '71 before the model was withdrawn so the SS is simply SS.
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