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Triumph 650 Transmission Mainshafts #99440
08/28/06 4:00 am
08/28/06 4:00 am
Joined: Mar 2005
Posts: 86
North Dakota U.S.A.
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1973tr5t Offline OP
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Could anyone tell me how many different transmission mainshafts were used in the 650s and how to identify them? Thank you in advance.

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Re: Triumph 650 Transmission Mainshafts #99441
08/28/06 7:48 am
08/28/06 7:48 am
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Tiger Offline
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Melbourne Australia
Four speed or 5 speed ?


1969 TR6R
7.62 x 51 is not a maths puzzle.
Re: Triumph 650 Transmission Mainshafts #99442
08/29/06 3:40 am
08/29/06 3:40 am
Joined: Mar 2005
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North Dakota U.S.A.
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1973tr5t Offline OP
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I am sorry, I forgot to say 4 speed.

Re: Triumph 650 Transmission Mainshafts #99443
08/31/06 10:09 am
08/31/06 10:09 am
Joined: Sep 2005
Posts: 461
sunshine coast, queensland, au...
bonnie john Offline
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sunshine coast, queensland, au...
glenn shows 8

T914
T1177
T2436
T2438
T3893
T4154
T4158
T4173

and that appears to be just the units


SPEED KILLS
do not exceed 250mg ...
Re: Triumph 650 Transmission Mainshafts #99444
09/02/06 12:11 am
09/02/06 12:11 am
Joined: Mar 2005
Posts: 86
North Dakota U.S.A.
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1973tr5t Offline OP
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I see that there are a number of part numbers, but having just sorted through a large pile of them, I only found two varations. One being longer than the other. Did I just happen to look at a non-representive sample of 650 mainshafts?

Re: Triumph 650 Transmission Mainshafts #99445
09/02/06 3:22 am
09/02/06 3:22 am
Joined: Sep 2005
Posts: 461
sunshine coast, queensland, au...
bonnie john Offline
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bonnie john  Offline
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Joined: Sep 2005
Posts: 461
sunshine coast, queensland, au...
all different... sizes, threads and gears

i have a table, don't know how to post it


SPEED KILLS
do not exceed 250mg ...
Re: Triumph 650 Transmission Mainshafts #99446
09/02/06 7:38 pm
09/02/06 7:38 pm
Joined: Mar 2005
Posts: 86
North Dakota U.S.A.
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1973tr5t Offline OP
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I would be very happy to see that information. Thank you.

Re: Triumph 650 Transmission Mainshafts #99447
09/03/06 3:01 am
09/03/06 3:01 am
Joined: Sep 2005
Posts: 461
sunshine coast, queensland, au...
bonnie john Offline
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sunshine coast, queensland, au...
boy, this is gonna hurt my hand, but here goes. just picking out the salient specs from chart


t 914 up to 67 std and wide ratio stepped shaft 16 teeth cei threads
t 1177 up to 61 (67???) close ratio stepped shaft 18 teeth cei threads
t 2436 68-early69 std and wide ratio stepped shaft 16 teeth unf threads
t 2438 68-early69 close ratio stepped shaft 18 teeth unf threads
t 3893 early 69 std and wide ratio stepped shaft 16 teeth shaved gear
t 4154 68-early 69 close ratio stepped shaft 18 teeth shaved gear
t 4158 late 69-70 std and wide ratio non stepped shaft 16 teeth shaved gear
t 4173 late 69-70 close ratio non stepped shaft 18 teeth shaved gear


SPEED KILLS
do not exceed 250mg ...
Re: Triumph 650 Transmission Mainshafts #99448
09/03/06 3:45 pm
09/03/06 3:45 pm
Joined: Mar 2005
Posts: 86
North Dakota U.S.A.
1
1973tr5t Offline OP
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Thank you so much. This is the sort of concrete information I have been looking for. Was this compiled or was there one source for it.

As I have delved into learning more about vintage Triumphs, I have found that there are plenty of opinions, plenty of "This is what I was told", plenty of "This is what worked for me", all of which is all very helpful.

Even so, it is so nice to find a large lump of useful information in one place

Thanks to everyone that puts up with the questions, even though they may have been asked before, and does not just say "GET THE manual". There is way to much needed information that never made it into a manual

Re: Triumph 650 Transmission Mainshafts #99449
09/03/06 3:47 pm
09/03/06 3:47 pm
Joined: Mar 2005
Posts: 86
North Dakota U.S.A.
1
1973tr5t Offline OP
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Joined: Mar 2005
Posts: 86
North Dakota U.S.A.
By the way, what does the term "shaved gear" mean? Can you better explain?

Re: Triumph 650 Transmission Mainshafts #99450
09/03/06 5:31 pm
09/03/06 5:31 pm
Joined: Aug 2006
Posts: 191
Ohio
M
mudmanc4 Offline
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M

Joined: Aug 2006
Posts: 191
Ohio
Shaved gear explination would help myself as well.
I have a 66 t120r, W/ 4 speed , is it possible to install a 5 speed ? W/ out major modification?

Cheers all g


66't120r Bonnie Chopper
Re: Triumph 650 Transmission Mainshafts #99451
09/04/06 10:06 am
09/04/06 10:06 am
Joined: Sep 2005
Posts: 461
sunshine coast, queensland, au...
bonnie john Offline
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Posts: 461
sunshine coast, queensland, au...
info is from "glenn's triumph two cylinder motorcycle repair" 1973 edition

sorry but don't know what shaved means but i have checked my early and late 4 speed shafts and there appears to be about a 10 thou difference between the shaft diameters and the gear bores of early to late ie my 70 bonnie parts to the older stuff that i have

hope this helps


SPEED KILLS
do not exceed 250mg ...

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