Triumph Motorcycle Models with Engine & Frame Serial Numbers
Twins 1950 - 69
Pre Unit 500-650 Twins
650's with the duplex frame used a D prefix.
1950 From 100N
1951 101NA - 15808NA
1952 15809NA - 25000NA, followed by 25000 - 32302
1953 32303 - 44134
1954 44135 - 56699
1955 56700 - 70929
1956 70930 - 82799, followed by 0100 - 0944
1957 0945 - 011115
1958 011116 - 020075
1959 020076 - 029363
1960 029364 - 030424, followed by D101 - D7726
1961 D7727 - D15788
1962 D15789 on
Unit 350-500 Twins
1957 H101 - H760
1958 H761 - H5484
1959 H5485 - H11511
1960 H11512 - H18611
1961 H18612 - H25251
1962 H25252 - H29732
1963 H29733 - H32464
1964 H32465 - H35986
1965 H35987 - H40527
1966 H40528 - H49832
1967 H49833 - H57082
1968 H57083 - H65572
1969 H65573 - H67331
Unit 650cc
1963 DU101 - DU5824
1964 DU5825 - DU13374
1965 DU13375 - DU24874
1966 DU24875 - DU44393
1967 DU44394 - DU66245
1968 DU66246 - DU85903
1969 DU85904 - DU90282
Models 1969 - 83
The engine number is located on the left side of the engine, immediately below the cylinder barrel flange. The number is stamped onto a raised pad. The frame number is located on the left side of the frame, nearest the stearing head. On both the '71 up, 250 single and 500 twin oil in frame bikes, the number is located on the kickstand lug. The Number consists of 4 sections.
The first letter indicates the month of manufacture.
The second letter indicates the year of manufacture.
A January 1979
B February 1980
C March 1969
D April 1970
E May 1971
G June 1972
H July 1973
J August 1974
K September 1975
N October 1976
P November 1977
X December 1978
1981-83 used a single 3 digit code.
KDA 1981
EDA 1982
BEA 1983
The third section is a numerical block of five figures which commence with engine number 00100.
The fourth section indicates the model. I have seen this section placed first on the pad as well.
Example
Month Year Number Model
J D 00100 T120R
Harris Built Bikes 1985-88
1985 FN000002 - FN000191
1986 GN000192 - GN000788
1987 HN000789 - HN001176
1988 JN001177 - JN001258