1921

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

6/7 H.P. TWIN100 T100770

1922

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

4.25 H.P. H2 OR K2R2B 109550
4.5 H.P. DE LUXEH105K 1550
6/7 H.P. TWIN2117 A1770

1923

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

2.75 H.P. 100 D1350
4.25 H.P. H2 OR K2R2B 109550
4.5 H.P. DE LUXEH105K 1550
6/7 H.P. TWIN2117 A1770
8 H.P. TWIN1 M21001000

1924

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

2.49 H.P. STANDARDB1BR 9400250
2.75 H.P. 100 D1350
3.5 H.P. L6501P 1350
4.98 H.P. DE LUXE6000 S1300500
4.5 H.P. LIGHTH320B 7680550
8 H.P. TAXI717 W1000
8 H.P. TWIN1 M21001000
8 H.P. TWIN COLONIAL1070 11000

1925

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

2.49 H.P. STANDARD DE LUXEB9800BR 9400250
3.49 H.P. F1 294 350
3.49 H.P. F1F 1350
3.49 H.P. OHV SUPER350
3.5 H.P. L6501P 1350
4.5 H.P. LIGHTH320B 7680450
4.98 H.P. DE LUXE6000 S1300500
7.70 H.P. DE LUXE1060 N1750
7.70 H.P. LIGHT7390 V1750
9.86 H.P. COLONIAL1330 L11000
9.86 H.P. DE LUXE1341 W29071000
9.86 H.P. LIGHT1270 W11000

1926

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

2.49 H.P. STANDARD DE LUXEB24400BR 24800250
3.49 H.P. F1 294 350
3.49 H.P. F1F 1350
3.49 H.P. OHV SUPER350
4.93 H.P. STANDARDM4000GM 4000500
4.98 H.P. DE LUXEM100U 1500
4.98 H.P. STANDARDM100G 1500
5.57 H.P. DE LUXEH3923K 20(X)550
5.57 H.P. LIGHTB3927B 13000550
7.70 H.P. DE LUXE1060 N1750
7.70 H.P. LIGHT7390 V1750
9.86 H.P. COLONIAL1330 L11000
9.86 H.P. DE LUXE1341 W29071000
9.86 H.P. LIGHT1270 W11000

1927

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

2.49 H.P. STANDARD DE LUXEB30900BR 31000250
3.49 H.P. OHV SUPERD100Z 9474350
4.93 H.P. OHVP2500P 2500500
4.93 H.P. STANDARD & SPECIAL SPORTSM3955 GM5741500
4.98 H.P. DE LUXEM8258U 4000500
5.57 H.P. H6000U 4933550
7.70 H.P. DE LUXEA100N 5231750
7.70 H.P. LIGHTA100V 3500750
9.86 H.P. DELUXEC100N 51341000

1928

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1.74 H.P. 2 STROKEN103E 101150
2.49 H.P. B35117B 36404250
3.49 H.P. F16680Z 13982350
3.49 H.P. OHV STANDARDL8820Z 13982350
3.49 H.P. OHV SUPERD655Z 13982350
4.93 H.P. M13304GM 9343500
4.93 H.P. M15874U 8735500
4.93 H.P. OHVP3217P 3789500
5.57 H.P. H4521U 8735550
7.70 H.P. TWINA969N 6001750
9.86 H.P. TWINC400N 60011000

1929

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1.75 H.P. A29 STANDARD 2 STROKEN1270E 1640150
1.75 H.P. STANDARD DE LUXE 2 STROKEY1 E1150
2.49 H.P. B29 DE LUXEB42108B 47120250
3.49 H.P. L29 DE LUXEF19501Z 19501350
3.49 H.P. L29 OHVL10501Z 19501350
3.49 H.P. L29 OHV 2 PORT SLOPERD1801J 101350
4.93 H.P. S29 2 PORT LIGHTK101H 101500
4.93 H.P. S29 OHV 2 PORT SLOPERP8850P 8500500
4.93 H.P. S29 DE LUXES101P 8500500
4.93 H.P. S29 STANDARDM9300G 5990500
4.93 H.P. OHV DIRT TRACKT101R 101500
5.57 H.P. H29 DE LUXEH8600P 9040550
7.70 H.P. E29A1740V 5001750
7.70 H.P. E29 DE LUXEC1850N 6760750
9.86 H.P. G29 WORLD TOURC1850N 67601000

1930

Model

Engne prefix

Engine sequence

Frame prefix

Frame sequence

CC

1.74 H.P. A30-2 3 SPEED 2 STROKEY101E 101150
2.49 H.P. B30-3XM101XB 101250
2.49 H.P. B30-4 OHVXR101XB 101250
3.49 H.P. L30-11 OHV DE LUXEXV101XH 101350
3.49 H.P. L30-5XT101XB 101350
3.49 H.P. L30-6 COMMERCIALXT101XA 101350
4.93 H.P. S30-12 OHVXW101XX 101500
4.93 H.P. S30-13 OHV DELUXEXP101XH 101500
4.93 H.P. S30-18 LIGHTXU101XL 101500
4.93 H.P. S30-19 OHV LIGHTXO101XL 101500
4.93 H.P. S30-7XS101XH 101500
4.93 H.P. S30-9 DELUXEXS101XH 101500
5.57 H.P. H30-10 DE LUXEXX101XH 101550
5.57 H.P. H30-8XX101XH 101550
7.70 H.P. E30-14 TWINXY101XD 101750
9.86 H.P. G30-15 TWINXZ101XD 1011000
9.86 H.P. G30-16 TWIN WORLD TOURXZ101XG 1011000
© BSAOC 1997, 1998, 1999, 2000. All rights reserved.

Pre 1929 markings are based on listings available to the Club but do NOT have any form of cross referencing, therefore there is no way of checking their accuracy. Post 1929, the listing are cross referenced by the despatch books and by contemporary listings in parts books and dealer service sheets, where available. This cross referencing is available for most models up to the closure of the factory. However we are currently revising the pre 1929 lists which we are cross referencing with machine which we have personally scrutinised and verified. We need your assistance to help us on this and request that anybody who has pre 1929 BSA bikes write to the machine dating officer Brian Pollitt (address below) with details of your machine and photos of the complete bike plus detailed photos of the engine. All photos will be returned.

BSAOC pre1929 Machine Dating.

Brian Pollitt

16 Dane Avenue

 Partington

Manchester

M31 4GB