BSA Models 1931 to 1940

1931
Model	Engne prefix	Engine sequence	Frame prefix	Frame sequence	CC
2.49 H.P. B31-1	Y1	101	Y1	101	250
2.49 H.P. B31-2 OHV	Y2	101	Y1	101	250
2.49 H.P. B31-3 OHV DE LUXE	Y3	101	Y3	101	250
2.49 H.P. L31-5 POST OFFICE	YT	101	Y5	101	250
3.49 H.P. L31-4	Y4	101	Y1	101	350

3.49 H.P. L31-5 DE LUXE	Y5	101	Y5	101	350
3.49 H.P. L31-6 OHV DE LUXE	Y6	101	Y5	101	350
4.93 H.P. S31-10 OHV DE LUXE	Y10	101	Y7	101	500
4.93 H.P. S31-7	Y7	101	Y7	101	500
4.93 H.P. S31-9 OHV	Y9	101	Y7	101	500
5.57 H.P. H31-8 DE LUXE	Y8	101	Y7	101	550
7.70 H.P. E31-11 TWIN 2 GALLON TANK	Y11	101	Y11	101	750
7.70 H.P. E31-11 TWIN 3 GALLON TANK	Y11	101	Y11A	101	770
9.86 H.P. G31-12 TWIN WORLD TOUR	Y12	101	Y12	101	1000

1932
Model	Engne prefix	Engine sequence	Frame prefix	Frame sequence	CC
2.49 H.P. B32-1 OHV	Z1	101	Z1	101	250
3.49 H.P. L32-2	Z2	101	Z1	101	350
3.49 H.P. L32-3 OHV	Z3	101	Z3	101	350
3.49 H.P. L32-4 DE LUXE H/CHANGE	Z4	101	Z4	101	350
3.49 H.P. L32-4 DE LUXE FOOT CHANGE	Z4	101	Z5	101	350
3.49 H.P. L32-5 OHV BLUE STAR H/CHG	Z5	101	Z4	101	350
3.49 H.P. L32-5 OHV BLUE STAR F/CHG	Z5	101	Z5	101	350
3.49 H.P. L32-5 OHV DE LUXE H/CHG	Z5	101	Z4	101	350
3.49 H.P. L32-5 OHV DE LUXE F/CHG	Z5	101	Z5	101	350
3.49 H.P. L32-5 OHV BLUE STAR H/CHG	Z11	101	Z4	101	350
3.49 H.P. L32-5 OHV BLUE STAR F/CHG	Z11	101	Z5	101	350
4.99 H.P. S32-8 OHV DE LUXE	Z8	101	Z8	101	500
4.99 H.P. W32-6 FOOT CHANGE	Z6	101	Z7	101	500
4.99 H.P. W32-6 HAND CHANGE	Z6	101	Z6	101	500
4.99 H.P. W32-7 OHV BLUE STAR F/CHG	Z12	101	Z7	101	500
4.99 H.P. W32-7 OHV BLUE STAR F/CHG	Z7	101	Z7	101	500
4.99 H.P. W32-7 OHV BLUE STAR H/CHG	Z12	101	Z6	101	500
4.99 H.P. W32-7 OHV BLUE STAR H/CHG	Z7	101	Z6	101	500
4.99 H.P. W32-7 OHV FOOT CHANGE	Z7	101	Z7	101	500
4.99 H.P. W32-7 OHV HAND/CHANGE	Z7	101	Z6	101	500
5.57 H.P. H32-9 DE LUXE	Z9	101	Z8	101	550
9.86 H.P. G32-10	Z10	101	Z10	101	1000


1933
Model	Engne prefix	Engine sequence	Frame prefix	Frame sequence	CC
2.49 H.P. B33-1	A1	101	A1	101	250
2.49 H.P. B33-2 OHV S.P.	A2	101	A1	101	250
2.49 H.P. B33-3 BLUE STAR JUNIOR	A3	101	A3L	101	250
3.48 H.P. R33-4 OHV	A4	101	A4	101	350
3.48 H.P. R33-5 OHV BLUE STAR H/CHG	A5	101	A4	101	350
3.48 H.P. R33-5 OHV BLUE STAR F/CHG	A5	101	A5	101	350
4.99 H.P. W33-6	A6	101	A4	101	500
4.99 H.P. W33-6 POST OFFICE	A6	101	A6	101	500
4.99 H.P. W33-7 OHV	A7	101	A4	101	500
4.99 H.P. W33-8 OHV BLUE STAR F/CHG	A8	101	A5	101	500
4.99 H.P. W33-8 OHV BLUE STAR H/CHG	A8	101	A4	101	500
4.99 H.P. W33-9 OHV SPECIAL H/CHG	A9	101	A9R	101	500
4.99 H.P. W33-9 OHV SPECIAL F/CHG	A9	101	A9L	101	500
5.95 H.P. M33-10	A10	101	A10	101	600
5.95 H.P. M33-11 OHV	A11	101	A10	101	600
9.86 H.P. G33-12 TWIN LIGHT	A12	101	A?		1000
9.86 H.P. G33-13 TWIN WORLD TOUR	A13	101	A13	101	1000
9.98 H.P. G33-14 TWIN WAR OFFICE	A14	101	A14	101	1000



1934
Model	Engne prefix	Engine sequence	Frame prefix	Frame sequence	CC
1.49 H.P. X34-0 OHV	B150	101	B1	101	150
2.49 H.P. B34-1	B1	101	B1	101	250
2.49 H.P. B34-17 OHV SPORTS	B17	101	B3	101	250
2.49 H.P. B34-2 OHV	B2	101	B1	101	250
2.49 H.P. B34-3 BLUE STAR JUNIOR	B3	101	B3	101	250
3.48 H.P. R34-4 OHV	B4	101	B4	101	350
3.48 H.P. R34-5 OHV BLUE STAR	B5	101	B4	101	350
3.48 H.P. R34-6 OHV SPECIAL	B6	101	B6	101	350
4.99 H.P. W34-7	B7	101	B7	101	500
4.99 H.P. W34-8 OHV	B8	101	B4	101	500
4.99 H.P. W34-9 OHV BLUE STAR	B9	101	B4	101	500
4.99 H.P. W34-10 OHV SPECIAL	B10	101	B6	101	500
4.98 H.P. J34-11 OHV TWIN	B11	101	B11	101	500
5.95 H.P. M34-12	B12	101	B12	101	600
5.95 H.P. M34-13 OHV	B13	101	B12	101	600
9.86 H.P. G34-14 TWIN WORLD TOUR	B14	101	B14	101	1000

1935
Model	Engne prefix	Engine sequence	Frame prefix	Frame sequence	CC
1.49 H.P. X35-0 OHV	E0	101	E1	101	150
2.49 H.P. B35-1	E1	101	E1	101	250
2.49 H.P. B35-2 OHV	E2	101	E1	101	250
2.49 H.P. B35-3 OHV DE LUXE	E3	101	E3	101	250
3.48 H.P. R35-4 OHV DE LUXE	E4	101	E3	101	350
3.48 H.P. R35-5 OHV BLUE STAR	E5	101	E5	101	350
3.48 H.P. R35-17 OHV Twin Port	E17	101	E5	101	350
4.98 H.P. W35-6	E6	101	E6	101	500
4.98 H.P. J35-12 OHV TWIN	E12	101	E12	101	500
4.99 H.P. W35-7 OHV	E7	101	E5	101	500
4.99 H.P. W35-8 OHV BLUE STAR	E8	101	E5	101	500
4.99 H.P. W35-9 OHV SPECIAL	E9	101	E9	101	500
5.95 H.P. M35-10	E10	101	E10	101	500
5.95 H.P. M35-11 OHV	E11	101	E10	101	600
7.50 H.P. J35-15 OHV TWN WAR OFFICE	E15	101	E15	101	750
9.86 H.P. G35-14 TWIN	E14	101	E14	101	1000

1936
Model	Engne prefix	Engine sequence	Frame prefix	Frame sequence	CC
1.49 H.P. X0 OHV	D0	101	D1	101	150
2.49 H.P. B1	D1	101	D1	101	250
2.49 H.P. B18 OHV LIGHT DE LUXE	D18	101	D1	101	250
2.49 H.P. B2 OHV	D2	101	D1	101	250
2.49 H.P. B3 OHV DE LUXE	D3	101	D3	101	250
3.48 H.P. R4 OHV DE LUXE	D4	101	D3	101	350
3.48 H.P. R17 OHV	D17	101	D6	101	350
3.48 H.P. R19 OHV COMPETITION	D19	101	D3	101	350
3.48 H.P. R20 OHV NEW BLUE STAR	D20	101	D6	101	350
3.48 H.P. R5 OHV EMPIRE STAR	3D5	101	D38	1101	350
3.48 H.P. R5 OHV EMPIRE STAR	D5	101	D8	101	350
4.96 H.P. Q21 OHV NEW BLUE STAR	D21	101	D6	101	500
4.96 H.P. Q7 OHV	D7	101	D6	101	500
4.96 H.P. Q8 OHV EMPIRE STAR	3D8	101	D38	1101	500
4.96 H.P. Q8 OHV EMPIRE STAR	D8	101	D8	101	500
4.98 H.P. J12 OHV TWIN	D12	101	D12	101	500
4.99 H.P. W6	D6	101	D6	101	500

5.95 H.P. M10	D10	101	D10	101	600
7.48 H.P. Y13 OHV TWIN	D13	101	D13	101	750
9.86 H.P. G14 TWIN	D14	101	D14	101	1000

1937
Model	Engne prefix	Engine sequence	Frame prefix	Frame sequence	CC
B20 TOURER	HB20	101	HB20	101	250
B21 OHV SPORTS	HB21	101	HB20	101	250
B22 OHV EMPIRE STAR	HB22	101	HB20	101	250
B23 TOURER	HB23	101	HB20	101	350
B24 OHV EMPIRE STAR	HB24	101	HB24	101	350
B25 OHV COMPETITION	HB25	101	HB24	101	350
B26 OHV SPORTS	HB26	101	HB24	101	350
M19 OHV DE LUXE	HM19	101	HM19	101	350
M20 TOURER	HM20	101	HM19	101	500
M22 OHV SPORTS	HM22	101	HM19	101	500
M23 OHV EMPIRE STAR	HM23	101	HM19	101	500
M21 TOURER	HM21	101	HM19	101	600
Y13 OHV TWIN	HY13	101	HY13	101	750
G14 TWIN	HG14	101	HG14	101	1000

1938
Model	Engne prefix	Engine sequence	Frame prefix	Frame sequence	CC
B20 TOURER	JB20	101	JB20	101	250
B21 OHV SPORTS	JB21	101	JB20	101	250
B22 OHV EMPIRE STAR	JB22	101	JB20	101	250
C10	JC10	101	JC10	101	250
C11	JC11	101	JC10	101	250
B23 TOURER	JB23	101	JB20	101	350
B24 OHV EMPIRE STAR	JB24	101	JB24	101	350
B25 OHV COMPETITION	JB25	101	JB24	101	350
B26 OHV SPORTS	JB26	101	JB24	101	350
M19 OHV DE LUXE	JM19	101	JM19	101	350
M20 TOURER	JM20	101	JM19	101	500
M22 OHV SPORTS	JM22	101	JM19	101	500
M23 OHV EMPIRE STAR	JM23	101	JM19	101	500
M24 GOLD STAR	JM24	101	JM24	101	500
M21 TOURER	JM21	101	JM19	101	600
Y13 OHV TWIN	JY13	101	JY13	101	750
G14 TWIN	JG14	101	JG14	101	1000

1939
Model	Engne prefix	Engine sequence	Frame prefix	Frame sequence	CC
B21 DE-LUXE	KB21	101	KB20	101	250
B21 STANDARD	KJB21	101	KJB20	101	250
C10 DE-LUXE	KC10	101	KC10	101	250
C10 STANDARD	KJC10	101	KJC10	101	250
C11	KC11	101	KC10	101	250
B23 STANDARD	KJB23	101	KJB20	101	350
B25 COMPETITION	KB25	101	KB24	101	350
B26	KB26	101	KB24	101	350
B23 DE-LUXE	KB23	101	KB20	101	350
B24 SILVER STAR	KB24	101	KB24	101	350
M20 DE-LUXE	KM20	101	KM20	101	500
M20 STANDARD	KMS20	101	KM20	101	500
M22 STANDARD	KJM22	101	KJM19	101	500

M23 SILVER STAR	KM23	101	KM23	101	500
M24 GOLD STAR	KM24	101	KM24	101	500
M21	KM21	101	KM20	101	600
G14 TWIN	KG14	101	KG14	101	1000

1940
Model	Engne prefix	Engine sequence	Frame prefix	Frame sequence	CC
C10	WC10	101	WC10	101	250
C11	WC11	101	WC10	101	250
B29 SILVER SPORTS	WB29	101	WB27	101	350
C12	WC12	101	WC10	101	350
W.D.B30	WB30	101	WB30	101	350
M20	WM20	101	WM20	101	500
M23 SILVER STAR	WM23	101	WM20	101	500
W.D. M20	WM20	9719	WM20	9719	500
W.D. M20	WM20	14439	WM20	14439	500
W.D. M20	WM20	18899	WM20	18899	500
W.D. M20	WM20	23039	WM20	23039	500
W.D. M20	WM20	27039	WM20	27039	500
M21	WM21	101	WM20	101	600
G14 TWIN	WG14	101	WG14	101	1000

1931

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1932

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1933

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1934

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1935

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1936

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1937

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1938

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1939

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1940

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC