frame and motor vin number? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 13 (permalink) Old 04-15-2009, 11:51 AM Thread Starter
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frame and motor vin number?

i aquired a triumph frame and dual carb motor, but cant find the motor number listed anywhere ! i know there are gurus here that might be able to help. frame number on the neck is H21437, which i believe is a 61? the dual amal carb motor number is TF17920, its a unit construction , but i can't find a reference to the id of the motor number . thx in advance!
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post #2 of 13 (permalink) Old 04-15-2009, 12:09 PM
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i aquired a triumph frame and dual carb motor, but cant find the motor number listed anywhere ! i know there are gurus here that might be able to help. frame number on the neck is H21437, which i believe is a 61? the dual amal carb motor number is TF17920, its a unit construction , but i can't find a reference to the id of the motor number . thx in advance!
If it is a -61. it can`t be a unit? Unit models run from -63.

Non of the numbers H21437 or TF17920 are listed as a unit-construction in the book, and I am not sure what You mean with the "dual amal carb motor number"?
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post #3 of 13 (permalink) Old 04-15-2009, 12:30 PM Thread Starter
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ok, let me clarify,,,, there is a number stamped on the L/S of the neck,,, H21437, there is a number stamped on the L/S engine case, just below the fins on the head, number is TF17920. the engine has two carburetors.
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post #4 of 13 (permalink) Old 04-15-2009, 12:34 PM Thread Starter
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ok, let me clarify,,,, there is a number stamped on the L/S of the neck,,, H21437, there is a number stamped on the L/S engine case, just below the fins on the head, number is TF17920. the engine has two carburetors.
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post #5 of 13 (permalink) Old 04-15-2009, 12:38 PM Thread Starter
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post #6 of 13 (permalink) Old 04-15-2009, 12:44 PM
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Originally Posted by bostonbill View Post
ok, let me clarify,,,, there is a number stamped on the L/S of the neck,,, H21437, there is a number stamped on the L/S engine case, just below the fins on the head, number is TF17920. the engine has two carburetors.
Ok, I understand!
From -63. to mid. -69 the engine and framenumbers have a DU prefix, DU101 to DU90282

From mid -69. the number had a prefix of two letters that indicated the month and year of manufacture.

Example: AC = January -69, BD = February -70. and so on..........

But I can not find "TF" prefix for the unit twin!

I can see your pics and see the number, but i don`t know what this is! Can it be a late model?

Last edited by terdah2; 04-15-2009 at 12:51 PM.
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post #7 of 13 (permalink) Old 04-15-2009, 12:55 PM Thread Starter
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ugh,, its driving me to drink! thx for the help terdah2! ive heard about the screwy motor and frame numbers triumph used, and i'm guessing this is a prime example,, but again,, thx for giving it a shot,, looks like its destined for the great salvage yard in the sky, and might get reincarnated as a honda fender. each triumph that meets its maker, makes the remaining ones that much more valuable!
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post #8 of 13 (permalink) Old 04-15-2009, 01:19 PM
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this is an early unit 350 or 500 twin, it has a threaded plug in the distributor mount later models this was not drilled out, and comparing the number stamped to my 70 T100C it looks like the number may have been ground off and restamped. Gearhead
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post #9 of 13 (permalink) Old 04-15-2009, 01:34 PM
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Sorry, was onely thinking 650/750, forgot the 350/500!
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post #10 of 13 (permalink) Old 04-15-2009, 01:41 PM
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Don't scrap it, part it out if you have to get rid of it. I'm sure there is someone that would want it just like it is, goofy numbers and all.
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