British Spares British Spares
Technical Info > BSA Engine & Frame Numbers 
B Range - 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 Codes
   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

All of the above information has been reproduced from the publications of Roy Bacon. Many of his
titles are available from us, find them in the Shopping>Accessories section of this site.
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