BSA engine and frame numbers

Engine and frame numbers started at 101 and counted upwards. Sometimes some changes were introduced during the production of a certain model. In order to identify these changes in a model the engine and/or frame number prefixes were changed. During 1938 BSA developed a number of new or modified models which were only introduced during the 1939 model year, hence the double year letter in the numbers. In that case a series of models did not necessarily start at 101 but at the number at which they ended the 1938 production year. Actually this was more or less a case of stamping the engine and the frame with another year letter.

Click one of these links to proceed directly to a certain model year:

model year 1930
model year 1931
model year 1932
model year 1933
model year 1934
model year 1935
model year 1936
model year 1937
model year 1938
model year 1939
model year 1940




modeldescriptionengine numberframe numberremarks
A30-21.74 h.p.Y...E...two stroke
B30-32.49 h.p. S.VXM.101XB.101
B30-42.49 h.p. O.H.V.XR.101XB.101
L30-53.49 h.p. S.V.XT.101XB.101
L30-53.49 h.p. S.V. commercialXT.101XA.101commercial carrier
S30-74.93 h.p. S.V.XS.101XH.101sloper
H30-85.57 h.p. S.V.XX.101XH.101sloper
S30-94.93 h.p. De Luxe S.V.XX.101XH.101sloper
H30-105.57 h.p. S.V. De luxeXX.101XH.101sloper
L30-113.49 h.p. O.H.VXS.101XH.101sloper
S30-124.93 h.p. O.H.V.XW.101XX.101sloper
S30-134.93 h.p. O.H.V. De LuxeXP.101XH.101sloper
E30-147.70 h.p. S.V. V-TwinXY.101XD.101V-twin
G30-159.86 h.p. S.V. V-TwinXY.101XD.101V-twin
G30-169.86 h.p. W.T. S.V. V-TwinXZ.101XG.101V-twin
S30-184.93 h.p. Light S.V.XU.101XL.101
S30-194.93 h.p. O.H.V. LightXU.101 of XO.101XL.101

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modeldescriptionengine numberframe numberremarks
B31-12.49 h.p. S.V.Y1-101Y1-101
B31-22.49 h.p. O.H.V.Y2-101Y1-101
B31-32.49 h.p. O.H.V. de LuxeY3-101Y3-101
L31-43.49 h.p. S.V.Y4-101Y1-101
L31-53.49 h.p. S.V. de LuxeY5-101Y5-101
L31-63.49 h.p. O.H.V.Y6-101Y5-101
S31-73.49 h.p. S.V.Y7-101Y7-101Sloper
H31-85.57 h.p. S.V.Y8-101Y7-101Sloper
S31-94.93 h.p. O.H.V.Y9-101Y7-101
S31-104.93 h.p. O.H.V. de LuxeY10-101Y7-101Sloper
E31-117.70 h.p. S.V.Y11-101Y11-1012 gallon tank V-Twin
E31-117.70 h.p. S.V.Y11-101Y11A-1013 gallon tank V-Twin
G31-129.86 h.p. S.V. W.T.Y12-101Y12-101V-Twin World Tour

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modeldescriptionengine numberframe numberremarks
B32-12.49 h.p. O.H.V.Z1-101Z1-101
B32-23.49 h.p. S.V.Z2-101Z1-101
L32-33.49 h.p. O.H.V. SpecialZ3-101Z3-101
L32-43.49 h.p. S.V. de LuxeZ4-101Z4-101hand change
L32-43.49 h.p. S.V. de LuxeZ4-101Z5-101foot change
L32-53.49 h.p. O.H.V. de LuxeZ5-101Z4-101hand change
L32-53.49 h.p. O.H.V. de LuxeZ5-101Z5-101foot change
L32-53.49 h.p. O.H.V. Blue StarZ5-101 of Z11-1051Z4-101hand change
L32-53.49 h.p. O.H.V. Blue StarZ5-101 of Z11-1051Z5-101foot change
W32-64.99 h.p. S.V.Z6-101Z6-101hand change
W32-64.99 h.p. S.V.Z6-101Z7-101foot change
W32-74.99 h.p. O.H.V.Z7-101Z6-101hand change
W32-74.99 h.p. O.H.V.Z7-101Z7-101foot change
W32-74.99 h.p. O.H.V. Blue StarZ7-101 of Z12-463Z6-101hand change
W32-74.99 h.p. O.H.V. Blue StarZ7-101 of Z12-463Z7-101foot change
S32-84.93 h.p. O.H.V. de LuxeZ8-101Z8-101Sloper
H32-95.57 h.p. S.V. de LuxeZ9-101Z8-101Sloper
G32-109.86 h.p. S.V.Z10-101Z10-101V-Twin

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modeldescriptionengine numberframe numberremarks
B33-12.49 h.p. S.V.A1-101A1-101
B33-22.49 h.p. O.H.V. S.P.A2-101A1-101
B33-32.49 h.p.O.H.V. Blue Star JuniorA3-101A3L-101
R33-43.48 h.p. O.H.V.A4-101A4-101
R33-53.48 h.p. O.H.V. Blue StarA5-101 A4-101hand change
R33-53.48 h.p. O.H.V. Blue StarA5-101 A5-101foot change
W33-64.99 h.p. S.V.A6-101A4-101
W33-74.99 h.p. O.H.V.A7-101A4-101
W33-84.99 h.p. O.H.V. Blue StarA8-101A4-101hand change
W33-84.99 h.p. O.H.V. Blue StarA8-101A5-101foot change
W33-94.99 h.p. O.H.V. SpecialA9-101A9R-101hand change
W33-94.99 h.p. O.H.V. SpecialA9-101A9L-101foot change
M33-105.95 h.p. S.V. de LuxeA10-101A10-101Sloper
M33-115.95 h.p. O.H.V. de LuxeA11-101A10-101Sloper
G33-129.86 h.p. S.V. LightA12-101A12-101V-Twin
G33-139.86 h.p. S.V. W.T.A13-101A13-101V-Twin World Tour

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modeldescriptionengine numberframe numberremarks
X34-01.49 h.p. O.H.V.B150-101B1-101
B34-12.49 h.p. S.V.B1-101B1-101
B34-22.49 h.p. O.H.V.B2-101B1-101
B34-32.49 h.p. O.H.V. Blue StarB3-101B3-101
R34-43.48 h.p. O.H.V.B4-101B4-101
R34-53.48 h.p. O.H.V. Blue StarB5-101B4-101
R34-63.48 h.p. O.H.V. SpecialB6-101B6-101
W34-74.99 h.p. S.V.B7-101B7-101
W34-84.99 h.p. O.H.V.B8-101B4-101
W34-94.99 h.p. O.H.V. Blue StarB9-101B4-101
W34-104.99 h.p. O.H.V. SpecialB10-101B6-101
J34-114.98 h.p. O.H.V. TwinB11-101B11-101V-Twin
M34-125.95 h.p. S.V. de LuxeB12-101B12-101Sloper
M34-135.95 h.p. O.H.V. de LuxeB13-101B12-101
G34-149.86 h.p. S.V. W.T.B14-101B14-101V-Twin
B34-172.49 h.p. O.H.V. SportsB17-101B3-101

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modeldescriptionengine numberframenumerremarks
X35-01.49 h.p. O.H.V.E0-101E1-101
B35-12.49 h.p. S.V.E1-101E1-101
B35-22.49 h.p. O.H.V.E2-101E1-101
B35-32.49 h.p. O.H.V. de LuxeE3-101E3-101
R35-43.48 h.p. O.H.V. de LuxeE4-101E3-101
R35-53.48 h.p. O.H.V. Blue StarE5-101E5-101
W35-64.99 h.p. S.V.E6-101E6-101
W35-74.99 h.p. O.H.V.E7-101E5-101
W35-84.99 h.p. O.H.V. Blue StarE8-101E5-101
W35-94.99 h.p. O.H.V. SpecialE9-101E9-101
M35-105.95 h.p. S.V.E10-101E10-101Sloper
M35-115.95 h.p. O.H.V.E11-101E10-101Sloper
J35-124.98 h.p. O.H.V. TwinE12-101E12-101V-Twin
G35-149.86 h.p. S.V.E14-101E14-101V-Twin

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modeldescriptionengine numberframe numberremarks
X-01.49 h.p. O.H.V.D0-101D1-101
B-12.49 h.p. S.V.D1-101D-101
B-22.49 h.p. O.H.V.D2-101D1-101
B-182.49 h.p. O.H.V. Light de LuxeD18-101D1-101
B-32.49 h.p. O.H.V. de LuxeD3-101D3-101
R-43.48 h.p. O.H.V. de LuxeD4-101D3-101
R-193.48 h.p. O.H.V. CompetitionD19-101D3-101
R173.48 h.p. O.H.V. S.P.D17-101D6-101
W-64.99 h.p. S.V.D6-101D6-101
Q-74.96 h.p. O.H.V.D7-101D6-101
Q-84.96 h.p. O.H.V. Empire StarD8-101D8-101
R-53.48 h.p. O.H.V. Empire StarD5-101D8-101
Q-84.96 h.p. O.H.V. Empire Star3D8-101D38-1101intermediate change
R-53.48 h.p. O.H.V. Empire Star3D5-101D38-1101intermediate change
J-124.98 h.p. O.H.V. TwinD12-101D12-101V-Twin
M-105.95 h.p. S.V.D10-101D10-101
Y-137.48 h.p. O.H.V.D13-101D13-101V-Twin
G-149.86 h.p. S.V.D14-101D14-101V-Twin
R-203.48 h.p. O.H.V. New Blue StarD20-101D6-101
Q-214.96 h.p. O.H.V. New Blue StarD21-101D6-101

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modeldescriptionengine numberframe numberremarks
B20250 c.c. S.V. TourerHB20-101HB20-101
B21250 c.c. O.H.V. SportsHB21-101HB20-101
B22250 c.c. O.H.V. Empire StarHB22-101HB20-101
B23350 c.c. S.V. TourerHB23-101HB20-101
B24350 c.c. O.H.V. Empire StarHB24-101HB24-101
B25350 c.c. O.H.V. CompetitionHB25-101HB24-101
B26350 c.c. O.H.V. SportsHB26-101HB24-101
M19350 c.c. O.H.V. de LuxeHM19-101HM19-101
M20500 c.c. S.V.TourerHM20-101HM19-101
M21600 c.c. S.V. TourerHM21-101HM19-101
M22500 c.c. O.H.V. SportsHM22-101HM19-101
M23500 c.c. O.H.V. Empire StarHM23-101HM19-101
Y13750 c.c. O.H.V. Vee TwinHY13-101HY13-101V-Twin
G141000 c.c. S.V. Vee TwinHG14-101HG14-101V-Twin

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modeldescriptionengine numberframe numberremarks
B20250 c.c. S.V. TourerJB20-101JB20-101
B21250 c.c. O.H.V. SportsJB21-101JB20-101
B22250 c.c. O.H.V. Empire StarJB22-101JB20-101
B23350 c.c. S.V. TourerJB23-101JB20-101
B24350 c.c. O.H.V. Empire StarJB24-101JB24-101
B25350 c.c. O.H.V. CompetitionJB25-101JB24-101
B26350 c.c. O.H.V. SportsJB26-101JB24-101
M19350 c.c. O.H.V. de LuxreJM19-101JM19-101
M20500 c.c. S.V. TourerJM20-101JM19-101
M21600 c.c. S.V. TourerJM21-101JM19-101
M22500 c.c. O.H.V. SportsJM22-101JM19-101
M23500 c.c. O.H.V. Empire StarJM23-101JM19-101
M24500 c.c. O.H.V. Gold StarJM24-101JM24-101eerste Gold Star
Y13750 c.c. O.H.V. Vee TwinJY13-101JY13-101V-Twin
G141000 c.c. S.V. Vee TwinJG14-101JG14-101V-Twin

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modeldescriptionengine numberframe numberremarks
C10 Standard250 c.c. S.V.KJC10-KJC10-1938 production
C10 De Luxe250 c.c. S.V.KC10-101KC10-101
C11250 c.c. O.H.V.KC11-101KC10-101
B21 Standard250 c.c. O.H.V.KJB21-KJB20-1938 production
B21 De Luxe250 c.c. O.H.V.KB21-101KB21-101
B23 Standard350 c.c. S.V.KJB23-KJB20-1938 production
B23 De Luxe350 c.c. S.V.KB23-101KB21-101
B24 Silver Star350 c.c. O.H.V.KB24-101KB24-101
B25 Competition350 c.c. O.H.V.KB25-101KB24-101
B26350 c.c. O.H.V.KB26-101KB24-101
M20 Standard500 c.c. S.V.KMS20-101KM20-101
M20 De Luxe500 c.c. S.V.KM20-101KM20-101
M21600 c.c. S.V.KM21-101KM20-101
M22 Standard500 c.c. O.H.V.KJM22-KJM19-1938 production
M22 De Luxe500 c.c O.H.V.KM22-101KM20-101
M23 Silver Star500 c.c. O.H.V.KM23-101KM23-101
M24 Gold Star500 c.c. O.H.V.KM24-101KM24-101
G14 Vee Twin1000 c.c. S.V.KG14-101KG14-101V-Twin

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modeldescriptionengine numberframe numberremarks
C10250 c.c. S.V.WC10-101WC10-101
C11250 c.c. O.H.V.WC11-101WC10-101
C12350 c.c. S.V.WC12-101WC10-101
B29 Silver Sports350 c.c. O.H.V.WB29-101WB27-101
M20500 c.c. S.V.WM20-101WM20-101
M21600 c.c. S.V.WM21-101WM20-101
M23 Silver Star500 c.c. O.H.V.WM23-101WM20-101
G14 Vee Twin1000 c.c. S.V.WG14-101WG14-101V-Twin

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Created: 12-4-98
Last udate: 21-3-01

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