EmailIdentification BSA B group engine and frame numbers
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Year/model |
Engine | Rigid | Plunger or S/arm |
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1937 B20 B21 B22 B23 B24 B25 B26 1938 B20 B21 B22 B23 B24 B25 B26 1939 B21 Deluxe B21 Standard B23 Deluxe B23 Standard B24 B25 1940-1944 B29 Silver Sport 1945 B31 1946 B31 B32 1947 B31 B32 B33 B34 1948 B31 B32 B33 B34 1949 B31 B32 B33 B34 1950 B31 B32 B32 (Alloy head) B33 B34 B34 (Alloy head) 1951 B31 B32 B32 (Alloy head) B33 B34 B34 (Alloy head) 1952 B31 B32 B32 (Alloy head) B33 B34 B34 Die cast head B34 Sand cast head 1953 B31 B32 B32 (Alloy head) B33 B34 B34 (Alloy head) 1954 B31 Rigid & S/arm B31 Plunger B32 Rigid & S/arm B33 Rigid & S/arm B33 Plunger B34 Rigid & S/arm 1955 B31 Plunger B32 Rigid B33 Plunger B34 Rigid 1956 B31 B32 Rigid B33 B34 Rigid 1957 B31 B32 B33 B34 1958 B31 B33 1959 B31 B33 1960 B33
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HB20 HB21 HB22 HB23 HB24 HB25 HB26 ------------ JB20 JB21 JB22 JB23 JB24 JB25 JB26 ------------ KB21 KJB21 KB23 KJB23 KB24 KB25 ------------ WB29 ------------ XB31 ------------ XB31 XB32 ------------ XB31 XB32 XB33 XB34 ------------ YB31 YB32 YB33 YB34
ZB31 ZB32 ZB33 ZB34 ------------ ZB31 9.001 ZB32 3.001 ZB32A 3.001 ZB33 4.001 ZB34 2.001 ZB34A 2.001
ZB31 15.001 ZB32 4.001 ZB32A 4.001 ZB33 7.001 ZB34 3.001 ZB34A 3.001 ------------ ZB31 21.001 ZB32 5.001 ZB32A 5.001 ZB33 11.001 ZB34 4.001 ZB34A 5.001 ZB34A 4.001 ------------ BB31 BB32 BB32A BB33 BB34 BB34A
BB31 6.001 BB31 6.001 BB32A 201 BB33 2.001 BB33 2.001 BB34A 201 ------------ BB31 15.001 BB32A 251 BB33 5.001 BB34A 301 ------------ BB31 22.001 BB32A 301 BB33 7.301 BB34A 351 ------------ BB31 BB32A BB33 BB34A ------------ GB31 GB33 ------------ GB31 1.909 GB33 662 ------------ GB33 1.001
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HB20 HB20 HB20 HB20 HB24 HB24 HB24 ------------ JB20 JB20 JB20 JB20 JB24 JB24 JB24 ------------ KB21 KJB20 KB21 KJB20 KB24 KB24 ------------ WB27 ------------ XB31 ------------ XB31 XB31 ------------ XB31 XB31 XB31 XB31 ------------ YB31 YB31 YB31 YB31
ZB31 ZB31 ZB31 ZB31 ------------ ZB31 9.001 ZB31 9.001 ZB31 9.001 ZB31 9.001 ZB31 9.001 ZB31 9.001
ZB31 14.001 ZB31 14.001 ZB31 14.001 ZB31 14.001 ZB31 14.001 ZB31 14.001 ------------ ZB31 19.001 ZB31 19.001 ZB31 19.001 ZB31 19.001 ZB31 19.001 ZB31 19.001 ZB31 19.001 ------------ BB31 BB31 BB31 BB31 BB31 BB31
BB31 1.386 BB31S 5.895 BB32R 121 BB31 1.386 BB31S 5.895 BB32R 121 ------------ BB31S 12.001 BB32A 201 BB31S 12.001 BB32A 201 ------------
B32R 301
B32R 301
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ZB31S ZB31S ZB31S ZB31S ------------ ZB31S 5.001 ZB31S 5.001 ZB31S 5.001 ZB31S 5.001 ZB31S 5.001 ZB31S 5.001
ZB31S 10.001 ZB31S 10.001 ZB31S 10.001 ZB31S 10.001 ZB31S 10.001 ZB31S 10.001 ------------ ZB31 17.001 ZB31 17.001 ZB31 17.001 ZB31 17.001 ZB31 17.001 ZB31 17.001 ZB31 17.001 ------------ BB31S BB31S BB31S BB31S BB31S BB31S
CB31
CB31 CB31 CB31 CB31 ------------ CB31 6.001 CB31 6.001 CB31 6.001 CB31 6.001 ------------ EB31 CB34 EB31 CB34 ------------ EB31 CB34 EB31 CB34 ------------ FB31 FB31 ------------ FB31 2.572 FB31 2.572 ------------ GB33
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