Engine & Frame Numbers

Engine & Frame Numbers

On this page you will find Triumph, BSA, and Norton engine numbers along with frame serial numbers. Engine numbers are usually located on the drive side of most British motorcycles below the cylinder barrel or above the primary cover on the engine case its self.

Frame numbers are usually stamped on the left side of the frame towards the top near the triple tree. Some BSA & Triumph models had frame numbers near the front engine support - check your frame to or identification numbers.    

 

Click here to download your free parts book for your Triumph, BSA or Norton motorcycle

 

Triumph 650 Unit Twins Engine & Frame Numbers (1963-1968)

 

1970 Triumph Bonneville T120R

Below you will find both Triumph engine and frame numbers for Triumph 650 unit twins from 1963-1968 and a Triumph 650 models list from 1963-1968.

Frame and engine numbers will be the same assuming they match as they would of when they left the factory. If your frame numbers or Triumph engine numbers do not match, you can still use this system to date each frame and / or the engine.

 

Triumph 650 Models (1963-1968)

Brand Model
Triumph 6T (Thunderbird)
Triumph T120R (Bonneville)
Triumph TR6R / TR6SR (Tiger / Trophy Sport)
Triumph T120C / T120TT
Triumph TR6C / TR6SC (Trophy)

 

 

 Engine & Frame Numbers (1963-1968)

 Year Starting Number Ending Number
1963 DU101 DU5824
1964 DU5825 DU13374
1965 DU13375 DU24874
1966 DU24875 DU44393
1967 DU44394 DU66245
1968 DU66246 DU85903
1968 DU85904 DU90282

 

Triumph 650 & 750 Unit Twins Engine & Frame Numbers (1969-1983)

 Triumph T140 750 Bonneville

 

In 1969, Triumph added a two-letter prefix to the actual engine number in order to indicate the month and model year - but not the actual year of manufacture.

In 1981 when the coding system would have been repeated, a third letter (A) was added to distinguish the number from the previous years.  

 

 

Triumph 650 & 750 Engine & Frame Numbers (1969-1983)

 

Example: T120R ED56946. E (Month) = May / D (Year) = 1970

 

 First Letter = Month Of Manufacture Second Letter = Model year Of Manufacture
A - January C - 1969
B - February D - 1970
C - March E - 1971
D - April G - 1972
E - May H - 1973
G - June J - 1974
H - July K - 1975
J - August N - 1976
K - September P - 1977
N - October X - 1978
P - November A - 1979
X - December B - 1980
DA - 1981
DA - 1982
EA - 1983

 

Triumph 350 & 500 Unit Twins Engine & Frame Numbers (1957-1974)

Triumph 500 Unit Twin 

 

Below you will find both Triumph engine and frame numbers for Triumph 350 and 500 unit twins from 1957-1974 and a Triumph models list from 1957-1974.

Frame and engine numbers will be the same assuming they match as they would of when they left the factory. If your frame numbers or Triumph engine numbers do not match, you can still use this system to date each frame and / or the engine.

 

Triumph 350 & 500 Models (1957-1974)

Brand Model
Triumph T21 (Twenty-One) / 3TA / T90
Triumph 5TA
Triumph T100A
Triumph T100C / T100SC
Triumph T100R Daytona / T100S
Triumph T100SS / T100SR

 

 Engine & Frame Numbers (1957-1969)

 Year Starting Number Ending Number
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

 

In 1969, Triumph added a two-letter prefix to the actual engine number in order to indicate the month and model year - but not the actual year of manufacture.

 

Engine & Frame Numbers (1969-1974)

 

 First Letter = Month Of Manufacture Second Letter = Model year Of Manufacture
A - January C - 1969
B - February D - 1970
C - March E - 1971
D - April G - 1972
E - May H - 1973
G - June J - 1974
H - July
J - August
K - September
N - October
P - November
X - December

 

BSA 500 & 650 Unit Twins Engine & Frame Numbers (1962-68)

 

1966 BSA A65 650 Lightning

 Below you will find BSA engine and frame numbers for BSA 500 & 650 unit twins from 1962-1968. Frame and engine numbers will be the same assuming they match as they would of when they left the factory.


Many early BSA A50 & A65 unit twins prior to 1966 left the factory without matching engine and frame numbers. If your frame or engine numbers do not match, you can still use this system to date each frame and / or engine.
 

 A50 = 500CC / A65 = 650CC

 

 Year / Model
Engine Numbers Frame Numbers
1962 A50 Star Twin (Cable Rear Brake) A50-101 A50-10
1962 A50 Star Twin (Rod Rear Brake) A50-101 A50A-101
1962 A65 Star Twin (Cable Rear Brake) A65-101 A50-101
1962 A65 Star Twin (Rod Rear Brake) A65-101 A50A-101
1963 A50 Star Twin (Rod Rear Brake) A50-823 A50-2288
1963 A65 Star Twin (Rod Rear Brake) A65-1947 A65-2288
1964 A50 Star A50A-101 A50-5501
1964 A50 Police A50AP-101    A50-5501
1964 A50C Cyclone  A50B-101 A50B-101
1964 A65 Star   A65A-101 A50-5501
1964 A65 Police A65AP-101 A50-5501
1964 A65R Rocket     A65B-101 A50B-101
1964 A65T Thunderbolt Rocket   A65B-101 A50-5501
1964 A65R Rocket W/ rev Counter A65C-101  A50-5501
1964 A65L Lightning Rocket A65D-101 A50B-101
1964 A65SH Spitfire Hornet A65E-101 A50B-101
1965 A50 Star    A50A-686 A50-8437
1965 A50 Police  A50AP-121 A50-8437
1965 A50 Cyclone Competition UK A50DC-101   A50-4001
1965 Cyclone UK A50DC-101 A50-4001
1965 A50C Cyclone Road Model A50D-101 A50B-4001
1965 A50CC Cyclone Competition A50B-507 A50-4001
1965 A65 Star A65A-1134 A50-8437
1965 A65 Police A65AP-267 A50-8437
1965 A65 Lightning A65DC-2158 A50B-4001
1965 A65 Lighting Clubman A65DC-2158 A50B-4001
1965 A65L Lightning Rocket A65D-1742 A50B-4001
1965 A65R Rocket A65B-334 A50-8437
1965 A65R Rocket W/ Rev Counter A65C-1082 A50-8437
1965 A65SH Spitfire Hornet A65E-701 A50B-4001
1966 A50R Royal Star A50R-101  A50C-101
1966 A50W Wasp A50W-101  A50C-101
1966 A65T Thunderbolt   A65T-101 A50C-101
1966 A65L Lightning   A65L-101   A50C-101
1966 A65LC Lightning Clubman   A65LC-101 A50C-101
1966 A65S Spitfire MK II     A65S-101 A50C-101
1966 A65H Hornet     A65H-101 A50C-101
1967 A50R Royal Star       A50RA-101       A50RA-101
1967 A50W Wasp A50WA-101 A50WA-101
1967 A65T Thunderbolt A65TA-101 A65TA-101
1967 A65L Lightning A65LA-101 A65LA-101
1967 A65SA Spitfire MK III  A65SA-101 A65SA-101
1967 A65H Hornet     A65HA-101  A65HA-101 
1968 A50R Royal Star A50RB-101 A50RB-101
1968 A50W Wasp  A50WB-101 A50WB-101
1968 A65T Thunderbolt   A65TB-101 A65TB-101
1968 A65L Lightning A65LB-101 A65LB-101
1968 A65F Firebird Scrambler  A65FB-101  A65FB-101 
1968 A65S Spitfire MKIV A65SB-101  A65SB-101 

 

 

BSA 500 & 650 Unit Twins Engine & Frame Numbers (1969-1972)

 

BSA Motorcycle Advertisment 1968

 

In 1969, BSA (exactly like Triumph) added a two-letter prefix to the actual engine number in order to indicate the month and model year but not the actual year of manufacture.  

 

Example A65 Lightning BC56946. B (Month) = February / C (Year) = 1969

 

 First Letter = Month Of Manufacture Second Letter = Model year Of Manufacture
A - January C - 1969
B - February D - 1970
C - March E - 1971
D - April G - 1972
E - May
G - June
H - July
J - August
K - September
N - October
P - November
X - December

 

 

BSA 250, 350, 441 & 500 Unit Singles Engine & Frame Numbers (1959-1973)

 

BSA Unit Singles

 

Below you will find BSA engine and frame numbers for all BSA unit singles produced from 1959-1973. Frame and engine numbers will be the same assuming they match as they would of when they left the factory.


Many early BSA unit singles prior to 1966 left the factory without matching engine and frame numbers. If your frame or engine numbers do not match, you can still use this system to date each frame and / or engine.

 

BSA Unit Singles - Models (1959-1973)

Brand Model
BSA C15 / C15T / C15S
BSA SS80 / SS90
BSA B25 / C25 / Barracuda / Starfire
BSA B44 / Victor / Shooting Star / Victor Special
BSA B40 / Enduro Star / Sportsman / Star

 Engine & Frame Numbers (1959-1973)

 Year / Model
Engine Numbers Frame Numbers
1959 C15 Star C15-101 C15-101
1959 C15 Scrambles C15S-101 C15S-101
1959 C15 Trails C15T-101 C15S-101
1960 C15 Star C15-1101 C15-11101
1960 C15 Scrambles C15S-301 C15S-501
1960 C15 Trails C15T-301 C15S-501
1961 C15 Star C15-21251 C15-22001
1961 C15 SS80 Sports Star 80 C15SS-101 C15-22001
1961 Scrambles C15S-2112 C15S-2701
1961 Trails C15T-1056 C15S-2701
1961 B40 Star B40-101 B40-101
1962 C15Star C15-29839 C15-31801
1962 C15 SS80 Sports Star 80 C15SS-1101 C15-31801
1962 Scrambles C15S-3101 C15S-3558
1962 Trials C15T-1451 C15S-3558
1962 Scrambles Special C15S-3101 C15S-10001
1962 Trials Special C15T-1451 C15S-10001
1962 B40 Star B40-3601 B40-3511
1962 SS90 Sports Star 90 B40BSS-101 B40-3511

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