I’ve read Burman used three lenghts of mainshafts on there GB gearbox:
- 1952>1958 SQ, 88,9mm
- 1952>1955 Single/Twin 71,4mm
- 1956>1958 Single/Twin 76,6mm
What models used 73mm?
Burman GB mainshaft lenght
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Paul Slootheer
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Burman GB mainshaft lenght
1953 Ariel VB project - 1950’s Rigid Matchless G3L project
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Roger Gwynn
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Re: Burman GB mainshaft lenght
There are 4 mainshafts used in GB gearboxes on Ariels
3629-52 Mainshaft 3-1/2" plain section SQ4 (88.9mm)
3630-52 Mainshaft 2-7/8" plain section Not SQ4 1952-55 (73.025)
3630-56 Mainshaft 3" plain section Not SQ4/HT 1956-58 (76.2mm)
3629-56 Mainshaft unknown length HT
I think someone has made an error in converting to mm, one of the reasons for keeping the imperial units, as it is obvious when an error has been made.
Does anyone know the length of an HT mainshaft to complete the story?
3629-52 Mainshaft 3-1/2" plain section SQ4 (88.9mm)
3630-52 Mainshaft 2-7/8" plain section Not SQ4 1952-55 (73.025)
3630-56 Mainshaft 3" plain section Not SQ4/HT 1956-58 (76.2mm)
3629-56 Mainshaft unknown length HT
I think someone has made an error in converting to mm, one of the reasons for keeping the imperial units, as it is obvious when an error has been made.
Does anyone know the length of an HT mainshaft to complete the story?
Roger Gwynn, caretaker of the club's works drawings and machine register, membership secretary 2015-26. Director of AOMCC, Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired. (roger@arielownersmcc.com)
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Paul Slootheer
- Holder of a Golden Anorak
- Posts: 1029
- Joined: Mon Jul 30, 2012 5:47 pm
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Re: Burman GB mainshaft lenght
So is it correct that the 1952-1954 shaft is the right one for a 1953 rigid frame?
1953 Ariel VB project - 1950’s Rigid Matchless G3L project
-
Roger Gwynn
- Holder of a Golden Anorak
- Posts: 2177
- Joined: Tue May 28, 2013 11:34 am
- Location: Norwich, UK
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Re: Burman GB mainshaft lenght
Yes, the change is to accommodate the FERC in 1956
Roger Gwynn, caretaker of the club's works drawings and machine register, membership secretary 2015-26. Director of AOMCC, Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired. (roger@arielownersmcc.com)
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