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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-27-2012, 05:55 PM   #1 (permalink)
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68 front end size

I'm new to triumphs and a new owner/builder. I just picked up a 68 bonneville 750, and want to start working on this as a winter project.
The motor is good, and sitting in a ridged bolt on. Main issue is the tins, I guess the guy wanted a Harley so he tossed a fat low rider tank and a pan style fender with a big 2 up seat on this 68.
I'm pulling all the ****ty tins off and gonna put a triumph tank, smaller rear fender and solo spring seat.
I'm looking around for front ends, maybe a springer if I find one. My question is what size front ends will fit in the 68 neck?
Please be kind cause plenty of stupid questions will be coming forth from me.
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Old 11-27-2012, 09:08 PM   #2 (permalink)
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Originally Posted by Cash43
68 bonneville 750
Not sure about the front -end but a '68 and a 750 cc engine is not the norm.

Aftermarket hop-up kit or more modern(?) engine?

Some pictures of what you have might help. . .

http://www.jockeyjournal.com/, might be of more help with this kind of question, or at least, good reference and reading material.
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Old 11-27-2012, 10:21 PM   #3 (permalink)
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From what I've read the 68 T120r came in a 750cc
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Old 11-28-2012, 08:54 AM   #4 (permalink)
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I am curious where you read Triumph made a 750cc T120R in 1968? I am certainly not familiar with that being the case and I have read a lot about 1968 T120R's since I have one. I don't believe Triumph produced a 750cc Bonnevillle until the early 70's.

Front tire size for a 1968 T120R is 3.25 x 19 and rear is 4.00 x 18 per the owners manual.

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Old 11-28-2012, 09:02 AM   #5 (permalink)
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I assume that you have a converted 650.

After market suppliers sold bar barrel and piston kits, the idea was pinched by Triumph, and in the early 70's the T140 was born.
or you have a genuine T140 engine in an earlier frame.

Post pictures of the engine number/frame and someone can tell you

The front ends between the non OIF and OIF bikes are not the same but I believe that the T150/60 yokes fit the earlier frames.
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Old 11-28-2012, 09:19 AM   #6 (permalink)
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The engine number is T120r du76543
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Old 11-28-2012, 09:28 AM   #7 (permalink)
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Here's the frame (working off iPhone so not sure if pics are loading correct)
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Old 11-28-2012, 09:37 AM   #8 (permalink)
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did the previous owner tell you it was a 750? closer-up pictures might help some of the more knowledgeable folks tell you if the barrels were aftermarket displacement upgrade. or maybe it's still the original 650...

your forks look like they're already 73-or-later (disc brake and one-piece aluminum legs) so you might already have non-original triples, too. i suspect more pictures would help in that regard as well.
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Old 11-28-2012, 09:55 AM   #9 (permalink)
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Where did your info come from? I think you will find the 750s were first produced in 1973 and were actually 724cc. Why do you think yours is a 750?
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Old 11-28-2012, 10:10 AM   #10 (permalink)
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I know the front end is newer, off a Honda I believe... As far as it being a 750cc I'm going off what the seller stated. I just picked it up a few days ago so I haven't ripped into it much
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