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Triumph engine#s #768792 03/21/19 11:25 am
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trumpet650 Offline OP
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Hello All, a friend of mine bought a 1972 T120R . Yet the Engine # is CG49844. It looks untampered with and looks to be a U.K. Home model as it still has the tax disc & the U.K. Gas Tank. Yet in my restoration manual , 1971 models start with engine # NE01436-FUE30869 & 1972 models start with HG30870 - JGXXXXX, Any info is most welcome.

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Re: Triumph engine#s [Re: trumpet650] #768794 03/21/19 12:43 pm
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Irish Swede Offline
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"HG" means it was produced in August of 1971 for the 1972 model year.
It seems unlikely, because the model year would normally begin in September, the code being "JG"
but with Triumph, sometimes strange exceptions to the rules happen.

"CG" means a 1972 model bike that was produced in March of 1972.

CAUTION: The so-called "restoration manuals" are not always correct.
None of them list 1945 Speed Twin serial numbers, but I have a photo of a 1945 5T engine serial number.

Re: Triumph engine#s [Re: trumpet650] #768796 03/21/19 1:02 pm
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Originally Posted by trumpet650
Yet the Engine # is CG49844. It looks untampered with and looks to be a U.K. Home model as it still has the tax disc & the U.K. Gas Tank. Yet in my restoration manual , 1971 models start with engine # NE01436-FUE30869 & 1972 models start with HG30870 - JGXXXXX, Any info is most welcome.


"FUE30869" ?

HE30869.

The year letter refers to model year, not calendar year, so HG (the beginning of 1972 model year production) is build date July (H) 1971 as new model production began during the previous calendar year.

The date code sequence for 1972 model production, therefore, is: HG (Jul 71), JG, KG, NG, PG, XG, AG (Jan 72), BG, CG (March 72), DG, etc.

Originally Posted by Irish Swede
"HG" means it was produced in August of 1971 for the 1972 model year.


H - July.

http://www.tri-corengland.com/acatalog/Triumph_Dating_information.html

"A - January
B - February
C - March
D - April
E - May
G - June
H - July
J - August
K - September
N - October
P - November
X - December"


Originally Posted by Irish Swede
It seems unlikely, because the model year would normally begin in September, the code being "JG"
but with Triumph, sometimes strange exceptions to the rules happen.


J - August.

It is a myth that production commenced in the same month (August) every year.


Originally Posted by Irish Swede
CAUTION: The so-called "restoration manuals" are not always correct.


Often because the date code system isn't fully explained.




Moderated by  John Healy 

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