Why is there no 750 Mk III Roadster??

750 mk3 or 850 mk3. There are definitely roadster 850 mk3's and the 750 roadster was a later addition after and modelled on the 750S.

en.wikipedia.org

Norton Commando - Wikipedia

en.wikipedia.org en.wikipedia.org

Roadster

Norton Commando 750cc Roadster
In March 1970 the updated S called the 'Roadster' was introduced. It had a low-level exhaust and upward-angled silencers with reverse cones.[9]

A Mk2 version was introduced in 1971,[14] and in 1972 the Combat engine and front disc brake were fitted.[18]

In 1973 the Roadster was available with the 850 engine, initially as an option but from October 1973 as the sole engine.[23] Production of the Roadster continued until 1977 when manufacture of the Commando stopped, although few Roadsters were made in the final year.[16] The Roadster was the most popular of the Commando models.[35]
 
Because Fastback and Roadster timelines are not the same at the beginning so the mark numbers don't align. The Roadster wasn't introduced until approximately 3/70 lasting to approximately 12/70 after which it became Roadster II from 1/71 to 12/71 when it jumped to Roadster IV in line with the Fastback IV and new Interstate. So technically the MkIV Roadster should have been MkIII.

Why is there no 750 Mk III Roadster??
 
L.A.B. said:
Because Fastback and Roadster timelines are not the same at the beginning so the mark numbers don't align. The Roadster wasn't introduced until approximately 3/70 lasting to approximately 12/70 after which it became Roadster II from 1/71 to 12/71 when it jumped to Roadster IV in line with the Fastback IV and new Interstate. So technically the MkIV Roadster should have been MkIII.

Why is there no 750 Mk III Roadster??
Click to expand...
Now I know 😊 many thank Les, I can sleep soundly
 
I have read that 850 Mk 3 Interstates were more common, but I see plenty of Roadsters now. My bike has an Interstate tank and seat, but Roadsters side covers, and I have seen at least one other like that, but who can know what was done to a particular bike in the decades since it left home?
 
TRWham said:
I have read that 850 Mk 3 Interstates were more common, but I see plenty of Roadsters now. My bike has an Interstate tank and seat, but Roadsters side covers, and I have seen at least one other like that, but who can know what was done to a particular bike in the decades since it left home?
Click to expand...
For those bikes where they have them the dispatch records from AN can answer some questions, and the info is much better for 74 and later but they don't have all.

It doesn't help that Norton made changes whenever - no actual "model year".

My all original MK2A Roadster has recently become more or less a MK2 Roadster in a refresh in that I changed the battery box, exhaust pipes and air box but I didn't change other MK2A things like 2nd gear.
 
Yes the change of 2nd gear occurred with the Mk1A, there's only one 2nd gear set in the Mk2/2A supplement. You can't believe everything AN says.

www.accessnorton.com

Media added by L.A.B.

www.accessnorton.com www.accessnorton.com

AN actually list the gears for Mk1A so how can they be '74 on.
andover-norton.co.uk

Andover Norton Parts Drawings - Andover Norton Factory Parts - Commando Parts

Andover Norton Parts are the only Norton spare parts in the market manufactured to original drawings, within the factory-approved tolerances, from the correct materials, and with the correct finish.
andover-norton.co.uk
 

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