Twin Engine and Frame Numbers:
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 stamped on the left side
of the frame, on the front
engine mounting lug. Both the engine and frame numbers should coincide.
Engine numbers had a prefix indicating the model type and a number from
the list below:
MODEL TYPE
PREFIX | MODEL |
T140V | 750cc Bonneville (5 speed) |
T140C | 750CC Trophy |
T140E | 750cc Bonneville |
TR7V | 750cc Tiger |
TR7RV | 750cc Tiger (5 speed) |
T120R | 650cc Bonneville |
T120RV | 650cc Bonneville (5 speed) |
TR6C | 650cc Trophy |
TR6CV | 650cc Trophy (5 speed) |
TR6R | 650cc Tiger |
TR6RV | 650cc Tiger (5 speed) |
TR5 | 500cc single Carburetter/Trophy |
T100R | 500cc Dual Carburetter/Daytona |
T100C | 500cc single carburetor/Tiger 100 or Trophy |
T100S | 500cc Tiger 100 |
T90 | 350cc Tiger90 |
5T | 500cc Speed Twin & Trophy |
6T | 650cc Thunderbird |
T110 | 650cc Tiger T110 |
T150 | 750cc Trident |
T150V | 750cc Trident (five speed) |
T160V | 750cc Trident (five speed/electric start) |
1950 through 1969:
year | Unit 350 & 500cc | Preunit 500 & 650cc | Misc |
1950 | ------ | from 100 N | ---- |
1951 | ------ | 101NA - 15808NA | ---- |
1952 | ------ | 15809NA - 2500NA then 25000 - 32302 | ---- |
1953 | ------ | 32303 - 44134 | ---- |
1954 | ------ | 44135 - 56699 | ---- |
1955 | ------ | 56700 - 70929 | ---- |
1956 | ------ | 70930 - 82799 then 0100 - 0944 | ---- |
1957 | H101 - H760 | 0945 - 011116 | First Unit 500cc/350cc |
1958 | H761 - H5484 | 011116 - 020075 | ---- |
1959 | H5484 - H11511 | 020076-029363 | ---- |
1960 | H11512 - H18611 | 029364 - 030424 then D101 - D7726 | ---- |
1961 | H18612 - H25251 | D7727 - D15788 | ---- |
1962 | H25252 - H29732 | D15789 on | ---- |
1963 | H29733 - H32464 | DU101 - DU5824 | First 650cc Unit, DU Designated |
1964 | H32465 - H35986 | DU5825 - DU13374 | 120R E5262 Filter |
1965 | H35987 - H40527 | DU13375 - DU24874 | 120R E5262 Filter |
1966 | H40528 - H49832 | DU24875 - DU44393 | 120R E5262 Filter |
1967 | H49833 - H57082 | DU44394 - DU66245 | DU59320 Concentric Carbs Start |
1968 | H57083 - H65572 | DU66246 - DU85903 | ---- |
1969 | H65573 - H67331 | DU85904 - DU90282 | ---- |
1969 and onwards:
The models produced after 1969 contained the same prefix designators
listed above, that indicated the model type, but the numbers were changed.
A new coding system (numbers) was introduced using a two letter prefix
for the month and model season year, followed by a number which began at
00100 for each model year and ran on irrespective of the model it was stamped
on. The model season started in August.
First Letter
A | January |
B | February |
C | March |
D | April |
E | May |
G | June |
H | July |
J | August |
K | September |
N | October |
P | November |
X | December |
Second Letter
Letter | Months | DESIGNATED YEAR |
C | October 1968 - July 1969 | 1969 |
D | August 1969 - July 1970 | 1970 |
E | October 1970 - July 1971 | 1971 |
G | August 1971 - July 1972 | 1972 |
H | August 1972 - June 1973 | 1973 |
J | August 1973 - October 1974 | 1974 |
K | April 1974 - June 1975 | 1975 |
N | July 1975 - June 1976 | 1976 |
P | June 1976 - August 1977 | 1977 |
X | July 1977 - August 1978 | 1978 |
A | July 1978 - November 1979 | 1979 |
B | August 1979 - July 1980 | 1980 |
DA | August 1979 - July 1980 | 1980 |
DA | September 1980 - April 1981 | 1981 |
DA | May 1981 - February 1982 | 1982 |
EA | February 1982 - January 1983 | 1983 |