BSA Dating Frame and Engine Numbers

BSA Dating Frame and Engine Numbers


- B series B31 & B33

Year
B31
Engine
B33
Engine
Rigid
Frame
Spring
Frame
1946 XB31-101 XB31-101
1947 XB31-101 XB33-101 XB31-101
1948 YB31-101 YB33-101 YB31-101
1949 ZB31-101 ZB33-101 ZB31-101 ZB31S-101
1950 ZB31-9001 ZB33-4001 ZB31-9001 ZB31S-5001
1951 ZB31-15001 ZB33-7001 ZB31-14001 ZB31S-10001
1952 ZB31-21001 ZB33-11001 ZB31-19001 ZB31S-17001
1953 BB31-101 BB33-101 BB31-101 BB31S-101
1954 BB31-6001 BB33-2001 BB31-1386 BB31S-5895
BB31-6001 BB33-2001 CB31-101
1955 BB31-15001 BB33-5001 BB31S-12001
BB31-15001 BB33-5001 CB31-6001
1956 BB31-22001 BB33-7301 EB31-101
1957 BB31- BB33- EB31-
1958 GB31-101 GB33-101 FB31-101
1959 GB31-1909 GB33-662 FB31-2572
1960 GB33-1001 GB33-101
BSA
Unit Twins, 1962-65

1962 Eng./Frame
1963
Eng./Frame
1964
Eng./Frame
1965
Eng./Frame
A50 A50-101/A50-101 A50-823/A50-2288 A50A-101/A50-5501 A50A-686/A50-8437
A50 (Police) A50AP-101/A50-5501 A50AP-121/A50-8437
A50C (USA) A50B-101/A50B-101 A50D-101/A50B-4001
A50CC (USA) A50B-507/A50B-4001
A50C & A50CC (UK) A50DC-101/A50B-4001
A65 A65-101/A50-101 A65-1947/A50-2288 A65A-101/A50-5501 A65A-1134/A50-8437
A65 (Police) A65AP-101/A50-5501 A65AP-267/A50-8437
A65R A65B-101/A50-5501 A65B-334/A50-8437
A65R (Rev counter) A65C-101/A50-5501 A65C-1082/A50-8437
A65T/R A65B-101/A50-5501
A65L/R A65D-101/A50B-101 A65D-1742/A50B-4001
A65SH A65E-101/A50B-101 A65E-701/A50B-4001
A65L & A65LC A65DC-2158/A50B-4001
BSA
Unit Twins, 1966-69

1966 Engine
1967
Eng. & Frame
1968
Eng. & Frame
1969
Eng. & Frame
A50 Royal Star A50R-101 A50RA-101 A50RB-101 A50RC-101
A50 Wasp A50W-101 A50WA-101 A50WB-101
A65 Thunderbolt A65T-101 A65TA-101 A65TB-101 A65TC-101
A65 Lightning A65L-101 A65LA-101 A65LB-101 A65LC-101
A65 Hornet A65H-101 A65HA-101
A65 Firebird A65FB-101 A65FC-101
A65 Spitfire A65S-101 A65SA-101 A65SB-101
Frame No. – All Models A50C-101
BSA
Models 1969 On

Code
Month Code Month Code Month
First Letter A January E May K September
B February G June N October
C March H July P November
D April J August X December

Code
Model
Year

Code
Model
Year
Second Letter C August 1968 – July 1969 G August 1971 – July 1972
D August 1969 – July 1970 H August 1972 – July 1973
E August 1970 – July 1971

Model Year
Model
1969-70 D175, D175B, B25S, B44SS, B44VS, A50R, A65T, A65L, A65F, A75
1971 D175, B25SS, B25T, A65FS
1971-72 B50SS, B50T, A65T, A65L, A75, A75V
1971-73 B50MX
1972 A70L

BSA Dating Frame and Engine Numbers

Bookmark and Share

Comments are closed.