'51 Triumph Thunderbird Pre-Unit - The Jockey Journal Board

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Old 03-14-2012, 02:58 AM   #1
Flo_28
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Default '51 Triumph Thunderbird Pre-Unit

Hi all,

Here's my '51 T.Bird ...
I started a new project fews months ago.

Original !!!









Some Home Made Parts ...
















Struts ...








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Old 03-14-2012, 02:59 AM   #2
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Default Re: '51 Triumph Thunderbird Pre-Unit



Ohhhh, I've got a question !!!

I would like to fit 2 carbs on my 650cc. What's the best couple of carburator ?? Amal number ??

Thanks a lot
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Old 03-14-2012, 03:04 AM   #3
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Default Re: '51 Triumph Thunderbird Pre-Unit

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Originally Posted by Flo_28 View Post


Ohhhh, I've got a question !!!

I would like to fit 2 carbs on my 650cc. What's the best couple of carburator ?? Amal number ??

Thanks a lot
Run a single carb, you'll be much happier.
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Old 03-14-2012, 03:07 AM   #4
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Default Re: '51 Triumph Thunderbird Pre-Unit

The best looking carbs are the Amal 389/689 left and right monobloc.

Amal 930's don't look as good on a pre unit, but easier parts wise..

And yes, a single carb is much easier setup/tuning wise.

Last edited by Zeeman; 03-14-2012 at 06:43 AM.
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Old 03-14-2012, 05:20 AM   #5
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Default Re: '51 Triumph Thunderbird Pre-Unit

That was a lovely looking donor bike you started with there. I hope you do justice to its memory!
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Old 03-14-2012, 07:58 AM   #6
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Default Re: '51 Triumph Thunderbird Pre-Unit

Thanks for your answer !!! Amal 389/689 are pretty hard to find !!!

Murphit:
Don't worry, there're NO big modifications on the frame. This is easy to back if you wan't to rebuild the original Thunderbird.


Thanks guys
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Old 03-14-2012, 08:20 AM   #7
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Default Re: '51 Triumph Thunderbird Pre-Unit

That's a good plan. I'm keeping my project's modifications reversible too, so that the bike can be put back to original if required.

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Old 03-14-2012, 09:26 AM   #8
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Default Re: '51 Triumph Thunderbird Pre-Unit

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That's a good plan. I'm keeping my project's modifications reversible too, so that the bike can be put back to original if required.

Exactly
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Old 03-14-2012, 10:53 AM   #9
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Default Re: '51 Triumph Thunderbird Pre-Unit

It's been my experience most people start out keeping all the original parts with the plan of being able to "put it back".
Typically the bike is later sold as a custom, and then all the stock parts get sold off.
Another one bites the dust.

But, it is your bike.
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Last edited by Tony the torch; 03-14-2012 at 11:03 AM.
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Old 03-14-2012, 11:00 AM   #10
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Default Re: '51 Triumph Thunderbird Pre-Unit

NICE, finally a thread that didn't ask permission to mod a good looking stock bike. Make it yours!
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Old 03-14-2012, 08:10 PM   #11
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Default Re: '51 Triumph Thunderbird Pre-Unit

Front is a later forks model.

Nice Tri !
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Old 03-14-2012, 08:34 PM   #12
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Default Re: '51 Triumph Thunderbird Pre-Unit

looks nice so far, but it looked pretty good to begin with.
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Old 03-14-2012, 11:53 PM   #13
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Default Re: '51 Triumph Thunderbird Pre-Unit

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Originally Posted by not45blesk View Post
Front is a later forks model.

Nice Tri !
Really ??
How do you see that ?? It seems to be the same in my manual
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Old 03-15-2012, 12:08 AM   #14
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Cool Re: '51 Triumph Thunderbird Pre-Unit

It looks like it has the correct type of front end on your bike. I think what he saw was that the nacelle is missing and the rubber gaiters and Trophy style headlight ears/fork shrouds are there in place of the nacelle.

A 6T would have come with a nacelle, technically anyway. It looks like you probably do but are your handlebars attached to the top triple tree by two U-bolts ?
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Old 03-15-2012, 12:35 AM   #15
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Default Re: '51 Triumph Thunderbird Pre-Unit

...mine is a 48 and came with that front end, and that 1" handlebar, but I think the 51 just have the nacelle unit...so may be re check the engine number or that front end is from a previous year
but Im not totally sure about it.

-yes, very difficult to locate one super nice old Trumph...
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Old 03-15-2012, 01:00 AM   #16
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Default Re: '51 Triumph Thunderbird Pre-Unit

Ohhh OK, yep i've got the nacelle and the original handlebars. The last owner removed those parts and give it to me.
Yep, there're 2 U-bolts to the top of the forks.
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Old 03-15-2012, 06:45 AM   #17
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Default Re: '51 Triumph Thunderbird Pre-Unit

Quote:
Originally Posted by whittiger650 View Post
A 6T would have come with a nacelle, technically anyway. It looks like you probably do but are your handlebars attached to the top triple tree by two U-bolts ?
Quote:
Originally Posted by Flo_28 View Post
Ohhh OK, yep i've got the nacelle and the original handlebars. The last owner removed those parts and give it to me.
Yep, there're 2 U-bolts to the top of the forks.
That's really helpful because my top yoke has U-bolts and I thought they were modified from standard. Mine is supposed to be a nacelle type as well.

How many attachment points are there for the nacelle? On my top yoke I've just got squared-off corners to the stanchion (tube) locators with threaded holes in them (one each side).

My bottom yoke has two forward-facing angled mounting bosses that are offset to the left (if sitting on the bike). I'm not sure what they're for.

Thanks

Mike

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Old 03-15-2012, 09:22 AM   #18
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Default Re: '51 Triumph Thunderbird Pre-Unit

Mine is a '55, but was not in the shape yours was! Yours is going to look great!
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Old 03-15-2012, 10:26 AM   #19
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Cool Re: '51 Triumph Thunderbird Pre-Unit

Those are nacelle triple trees then. Looks like you have everything you need, at least the major parts anyway.


Quote:
Originally Posted by Flo_28 View Post
Ohhh OK, yep i've got the nacelle and the original handlebars. The last owner removed those parts and give it to me.
Yep, there're 2 U-bolts to the top of the forks.


murphit, I believe it's for mounting the horn on nacelles models. Not 100% though.


Quote:
Originally Posted by murphit
My bottom yoke has two forward-facing angled mounting bosses that are offset to the left (if sitting on the bike). I'm not sure what they're for.
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Old 03-15-2012, 11:02 AM   #20
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Default Re: '51 Triumph Thunderbird Pre-Unit

I'm sorry guys, but it's pretty hard for me to understand everything !!!

Well, thanks for all those comments !!!
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