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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
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)
T100R 500cc Dual Carburetter/Daytona
T100C 500cc single carburetor/Tiger or Trophy
T100C 500cc single carburetor/Tiger 100 or Trophy
T100S 500cc Tiger 100
T90 350cc Tiger90
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 & 500ccPreunit 500 & 650cc
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
1958 H761 - H5484011116 - 020075
1959 H5484 - H11511 020076-029363
1960 H11512 - H18611029364 - 030424 then D101 - D7726
1961 H18612 - H25251D7727 - D15788
1962 H25252 - H29732D15789 on Unit 650CC
1963 H29733 - H32464DU101 - DU5824
1964 H32465 - H35986DU5825 - DU13374
1965 H35987 - H40527DU13375 - DU24874
1966 H40528 - H49832DU24875 - DU44393
1967 H49833 - H57082DU44394 - DU66245
1968 H57083 - H65572DU66246 - DU85903
1969 H65573 - H67331DU85904 - 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 19691969
D August 1969 - July 19701970
E October 1970 - July 19711971
G August 1971 - July 1972 1972
H August 1972 - June 19731973
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

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