BSA A28, A29, A30


Make Model

BSA A28 - A30-2


1928 - 30


Two stroke, single cylinder 3-Port


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



Final Drive



Dry clutch



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


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.