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4 speed transmission interchangability #345590
11/29/10 3:36 am
11/29/10 3:36 am
Joined: Apr 2007
Posts: 205
Ontario , Canada
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peter berry Offline OP
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I am looking at a complete 4 speed transmission , layshaft & main shaft with gears . Are they interchangable between all 650 unit twins or are they specific to years Thanks Peter
76 T140
66 TR6 project

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Re: 4 speed transmission interchangability [Re: peter berry] #345807
11/30/10 8:09 pm
11/30/10 8:09 pm
Joined: Apr 2007
Posts: 205
Ontario , Canada
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peter berry Offline OP
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Any body have any idea on this would be greatly appreciated , cant find anything specific in the archives Thanks again Peter

Re: 4 speed transmission interchangability [Re: peter berry] #345822
11/30/10 9:19 pm
11/30/10 9:19 pm
Joined: Mar 2005
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Boston, Massachusetts
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John Healy Online content

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As a donor set, all bits from a single motorcycle, they are interchangeable from 1964 (1963 has a different high gear spline) to 1970. 1971-72 can also be used with a bit of thought, again you want a set of gears from a single donor motorcycle.

There were changes in the diameters of the shafts and gears, some were made by BSA to a different standard than Triumph used, and you need to be a wiz kid to sort out an odd set of 4 speed gears and shafts. It can be done, but some experience required.


Re: 4 speed transmission interchangability [Re: peter berry] #345823
11/30/10 9:24 pm
11/30/10 9:24 pm
Joined: Sep 2001
Posts: 2,775
Comox BC Canada
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Gordo in Comox Offline
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John: Does any of the above rational apply to the mixing and matching of unit T100 gears sets between the years, either complete sets or odd gears?

Thanks

Gordo


Without frequent roadside repairs there is no fun in riding!
Re: 4 speed transmission interchangability [Re: Gordo in Comox] #345828
11/30/10 9:47 pm
11/30/10 9:47 pm
Joined: Apr 2007
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Ontario , Canada
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peter berry Offline OP
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Thanks , Im looking at a complete matched 4 speed set not sure what year Peter

Re: 4 speed transmission interchangability [Re: peter berry] #345839
12/01/10 12:36 am
12/01/10 12:36 am
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John Healy Online content

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Gordo:

There does not seem to be the same situation with the 500 gear sets. To my knowledge all of the 500 gears and shafts were all made in Meriden using the Triumph standard for shafts diameters and gear bores.

There is a Wall Poster based upon some work done by Jack Shortland, US export parts manager, and a couple of others. It illustrates both the BSA and Triumph standards and gives dimensions. It also has an interchange which in theory was intended to allow you to identify alternate gears, but as Jack confided to me that even they could not sort all of this out and the chart was their "best guess".

I am sure some one can post the dimensions which should help people identify compatible gears and shafts.


Re: 4 speed transmission interchangability [Re: peter berry] #345871
12/01/10 6:46 am
12/01/10 6:46 am
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Comox BC Canada
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Thanks John.

Gordo


Without frequent roadside repairs there is no fun in riding!
Re: 4 speed transmission interchangability [Re: peter berry] #345887
12/01/10 9:15 am
12/01/10 9:15 am
Joined: Oct 2003
Posts: 3,524
Emsworth, sunny south of Engla...
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dave jones Offline
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Emsworth, sunny south of Engla...
Peter- The only things I can think of that would be of any use is that in 1968 the clutch oil seal changed in size to run on the high gear itself rather than the high gear bush. Not sure if you need the whole plate behind the clutch to go with this or if you can use the same one. The other thing is that early machines require the speedo to be driven from the gearbox and early gearsets are designed for this. Otherwise, as John Healy says, you can put any four speed set in.
Don't know if you can put a four speed in five speed cases.
Dave

Re: 4 speed transmission interchangability [Re: dave jones] #346071
12/02/10 5:32 am
12/02/10 5:32 am
Joined: Sep 2008
Posts: 284
Goldendale, Washington
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40 Below! Offline
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Yes, you can put a 4spd in a 5 spd case.


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Re: 4 speed transmission interchangability [Re: 40 Below!] #346076
12/02/10 8:04 am
12/02/10 8:04 am
Joined: Jul 2007
Posts: 451
redondo beach, ca
Bob G Offline
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redondo beach, ca
I seem to remember the old Glenn's Triumph manual had a very detailed chart that showed gear and shaft interchangeability (with part numbers) between the different years.
Thia would be a great help for anyone trying to mix and match transmission parts.


Bob Gregor
Re: 4 speed transmission interchangability [Re: Bob G] #346098
12/02/10 12:19 pm
12/02/10 12:19 pm
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Posts: 205
Ontario , Canada
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peter berry Offline OP
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I think I have an old Glens lying around I will take a look Thanks


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