Triumph pre unit identification

[montessa172]

I think its a 1951? Thunderbird? Any ideas on the asterix after the serial number?? Anyways, picked it up for a song, not seized, has compression... And its gonna be the heart for my next project.. Came with the transmission, engine / tranny mounts and a set of head pipes. Unfortunately none of the primary gear train... Carby isn't even seized up, although I have no idea of what it is other than its an amal with a remote float bowl??, that might make a nice shelf decoration... I've never taken on a british engine before so this should be an interesting project...


P6041235 by Montessa172, on Flickr


P6041234 by Montessa172, on Flickr


P6041233 by Montessa172, on Flickr


P6041236 by Montessa172, on Flickr

 

[alexmac]

What you have is a mystery. According to my Triumph books, the 1951 engine serials all had a NA suffix after the numbers. You might have
something very unique.

The best place to ask would be:

http://www.triumphrat.net/classic-vintage-and-veteran/

or even better perhaps :

Triumph Motorcycles Ltd
Normandy Way
Hinckley
Leicestershire
LE10 3BZ
United Kingdom
Telephone +44(0) 1455 251700

 

[montessa172]

Thanks Alex, ive done some more research and I think I do have something different here. Its an alloy head and barrel close pitch fin motor, T100 castings on the case and barrel and a Unknown number On the head.. With a TBird serial number, almost...I'm going to post this in lounging at da club and plead for knowledge from a wider audience...

 

[alexmac]

I would PM Swan ..he is someone who knows a lot about Pre Unit Triumph bikes


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[joea]

1951 650 t/bird....normal external oil drain back lines, no alloy until 54 only t110's had alloy. amal carb looks correct....it may be a mix of a few different items which is not uncommon...just need to know what goes with what so you do not have issues...
joe@ vcycle

 

[teazer]

It's all 500 as we mentioned in the other thread. Carb dates it as an early one though - probably 51-54 (pre-monobloc)