1931

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This year BSA had 12 models lined up in the catalogue. All models could be supplied with either acetylene or electric lights. Also BSA had 5 sidecars models on offer.

 

BSA 1931 models

Model

 

Description

 

Remarks

 
2.49 h.p. B31-1 B31-1 or 2.49 h.p. This was bottom of the market side valve model for this year. black frame, green petrol tank
2.49 h.p. O.H.V. B31-2 B31-2 or 2.49 h.p. O.H.V. the step through model 249cc overhead valve with oil in sump. black frame, chrome plated petrol tank with green top panel, no instrument panel 
2.49 h.p. O.H.V. B31-3 de Luxe B31-3 de Luxe or 2.49 h.p. O.H.V. de Luxe. A pimped up version of the B31-2 with an instrument panel fitted on the handlebars and some other extras black frame, chrome plated petrol tank with green top panel, instrument panel om handlebars, two level petrol tap, front stand. Special matt finish to crankcase and gearbox. Hinged rear mudguard extra
3.49 h.p. L31-4 L31-4 or 3.49 h.p. the standard model 349cc sidevalve. black frame, green petrol tank
3.49 h.p. L31-5 de Luxe L31-5 de Luxe or 3.49 h.p. de Luxe, a luxury 349cc sidevalve fitted with an instrument panel and special matt finish to crankcase and gearbox. black frame, green petrol tank, instrument panel om handlebars, two level petrol tap, front stand. Special matt finish to crankcase and gearbox.
3.49 h.p. O.H.V. de Luxe L31-6 L31-6 de Luxe or 3.49 h.p. O.H.V. de Luxe The 349cc overhead valve model was only available in de Luxe trim with chrome plated petrol
tank, instrument panel and special finish to crankcase and gearbox.
black frame, chrome plated petrol tank with green top panel, instrument panel om handlebars, two level petrol tap, front stand. Special matt finish to crankcase and gearbox.
4.93 h.p. S31-7 S31-7 or 4.93 h.p. The basic 493cc sidevalve Sloper. black frame, green petrol tank
5.57 h.p. de Luxe H31-8 H31-8 de Luxe or 5.57 h.p. de Luxe. The de Luxe model 557cc
sidevalve Sloper complete with instrument panel, footboards and special
finish to crankcase and gearbox.
black frame, green petrol tank. Special matt finish to crankcase and gearbox
4.93 h.p. O.H.V. S31-9 S31-9 or 4.93 h.p. O.H.V. The basic model 493cc overhead valve Sloper. black frame, green petrol tank, instrument panel on handlebars. Twistgrip throttle optional.
4.93 h.p. O.H.V. de Luxe S31-10 S31-10 de Luxe or 4.93 h.p. O.H.V. de Luxe. The de Luxe specification of the S31-9 with chrome plated petrol tank, instrument panel and special finish to crankcase and gearbox. black frame, chrome plated petrol tank with green top panel, instrument panel, two level petrol tap, front stand. Special matt finish to crankcase and gearbox. Twistgrip throttle optional.
7.70 h.p. E31-11 E31-11 or 7.70 h.p. The last appearance of the first BSA V-twin of 770cc with instrument panel. black frame, green petrol tank, instrumentpanel on handlebars.
9.86 h.p. W.T. G31-12 G31-12 W.T. or 9.86 h.p. W.T. The 986cc sidevalve V-twin in World Tour trim with instrument panel, with total loss lubrication and additional hand pump for an extra shot of oil. black frame, green petrol tank, instrumentpanel on handlebars. Large deeply valanced front mudguard. front and rear wheel quickly detachable.

 

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