'51 Triumph Thunderbird Pre-Unit

[Flo_28]

Hi all,

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

Original !!!









Some Home Made Parts ...
















Struts ...

[Flo_28]

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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

[Glider]

Originally Posted by Flo_28

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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.

[Zeeman]

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.

[Murphit]

That was a lovely looking donor bike you started with there. I hope you do justice to its memory!

[Flo_28]

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

[Murphit]

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.

[Flo_28]

Originally Posted by Murphit

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

[Tony the torch]

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.

[Olgraybeard]

NICE, finally a thread that didn't ask permission to mod a good looking stock bike. Make it yours!

[not45blesk]

Front is a later forks model.

Nice Tri !

[dvrogers]

looks nice so far, but it looked pretty good to begin with.

[Flo_28]

Originally Posted by not45blesk

Front is a later forks model.

Nice Tri !

Really ??
How do you see that ?? It seems to be the same in my manual

[whittiger650]

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 ?

[reverb]

...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...

[Flo_28]

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]

Originally Posted by whittiger650

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 ?

Originally Posted by Flo_28

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

[McKnuckle]

Mine is a '55, but was not in the shape yours was! Yours is going to look great!

[whittiger650]

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

Originally Posted by Flo_28

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.

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.

[Flo_28]

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

Well, thanks for all those comments !!!