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Technical Info > Triumph Engine & Frame Numbers 
 Triumph - Twins 1950 - 69  Year Engine No. Unit 350 & 500cc Engine No. Pre-Unit 500 & 650cc

Engine & frame numbers on these models were all the same & were preceded by the model code. The N suffix was used in 1950 & NA for 1951/2. 350/500 twins all used an H prefix. The 650 models with the duplex frame used a D prefix & unit 650 duplex used a DU prefix. Additional suffixes were used to designate model type or condition eg. TT (model type), C (high compression) or P (police). Some of these only appeared in certain markets.

 1950   From 100N
 1951   101NA - 15808NA
 1952   15809NA - 25000NA, then 25000 - 32302
 1953   32303 - 44134
 1954   44135 - 56699
 1955   56700 - 70929
 1956   70930 - 82799, then 0100 - 0944
 1957 H101 - H760 0945 - 011115
 1958 H761 - H5484 011116 - 020075
 1959 H5485 - H11511 020076 - 029363
 1960 H11512 - H18611 029364 - 030424, then D101 - D7726
 1961 H18612 - H25251 D7727 - D15788
 1962 H25252 - H29732 D15789 on
     Engine No. Unit 650cc
 1963 H29733 - H32464 DU101 - DU5824
 1964 H32465 - H35986 DU5825 - DU13374
 1965 H35987 - H40527 DU13375 - DU24874
 1966 H40528 - H49832 DU24875 - DU44393
 1967 H49833 - H57082 DU44394 - DU66245
 1968 H57083 - H65572 DU66246 - DU85903
 1969 H65573 - H67331 DU85904 - DU90282
 
 Triumph Twins, Triples & Singles - 1969-1983  Letter Month Model Year

During 1969 a new number system was introduced which used a two-letter prefix indicating month & year, followed by the model type & the serial number. The first letter is the month, the second the year. This system used the Triumph model year not calendar year, which ran from August of the previous year to July of the current year. From July 1980 a third letter A was added to allow the system to keep going. Many model types included a V which designates a 5 speed gearbox.

For example: T140V HK12345 - is a 5 speed T140 model built in July of model year 1974/75.

Also; T140E NDA12345 - Is a T140E model built in October of model year 1982.

 A January Aug 1978 - July 1979
 B February Aug 1979 - July 1980
 C March Aug 1968 - July 1969
 D April Aug 1969 - July 1970
 E May Aug 1970 - July 1971
 G June Aug 1971 - July 1972
 H July Aug 1972 - July 1973
 J August Aug 1973 - July 1974
 K September Aug 1974 - July 1975
 N October Aug 1975 - July 1976
 P November Aug 1976 - July 1977
 X December Aug 1977 - July 1978
 KDA 1981 models Sept 1980 - Apr 1981
 EDA 1982 models May 1981 - Jan 1982
 BEA 1983 models Feb 1982 - Jan 1983
 T140V AEA34393 - Last model Jan 21st, 1983
 
 Harris Twins - 1985-1988  Year Engine & Frame Number
The easiest of the lot. The numbers were used for both Bonneville & Tiger models irrelevant of model type.  1985 FN000002  -  FN000191
 1986 GN000192  -  GN000788
 1987 HN000789  -  HN001176
 1988 JN001177  -  JN001258
 

All of the above information has been reproduced from the publications of Roy Bacon. Many of his
titles are available from us, find them in the Shopping>Accessories section of this site.
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