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BSA A28, A29, A30

Make Model	BSA A28 - A30-2
Year	1928 - 30
Engine	Two stroke, single cylinder 3-Port
Capacity	174 cc / 10.6 cub in.
Bore and Stroke	60 x 61.5 mm
Exhaust	Single, stainless steel
Ignition	Magneto
Battery	6V
Starting	Slip on kick starter
Max Power	1.25 kW / 1.7 hp
Transmission	2-Speed
Final Drive	Chain
Clutch	Dry clutch
Frame	duplex
Seat height	Upwards adjustable from 711 mm / 28 in. lowest setting
Front Suspension	Single spring girder fork
Rear Suspension	None, spring loaded saddle
Front Tyre	2.375 x 24
Rear Tyre	2.75 x 24
Front Brakes	None
Rear Brakes	Hand lever and foot pedal working independently on rear wheel dummy rim, drum, internal expandable

The model description in the catalogue is very promising indeed: “ It’s a machine that anyone can learn to ride in a few minutes, and ride with confidence, because it is so light, comfortable and easy to handle. The two stroke engine is easy to start and very economical to run.

This machine is fully capable of doing long distance journeys at a good average speed and it is backed by the B.S.A. reputation for consistent reliability.”

Introduced for the 1928 season, the A28 was BSA's first production two-stroke.

In terms of its specification, the little BSA was a cut above the (predominantly) Villiers-engined opposition, boasting unitary construction of the engine/two-speed transmission, a dry clutch and primary drive by gears. The engine/gearbox unit was carried in a bolted-up duplex frame and there were two brakes, both of which operated on the rear wheel. Priced at £28 10s, the A28 comfortably undercut BSA's cheapest four-stroke model, the 249cc B28 De Luxe, which cost a comparatively hefty £37 15s.