BSA Bluestar


Make Model

BSA Bluestar 250 cc, 350 cc and 500 cc

(Specifications that follow is for the Bluestar 500)


1932 - 51


Four stroke, single cylinder, OHV, 2 valve


496 cc / 30.3 cub in.
Cooling System Air cooled
Compression Ratio 9.5:1
Lubrication Wet sump
Carburetor Amal, pump
Exhaust Twin, upswept, steel, chrome
Starting Kick

Max Power

40 kW / 54 hp @ 4500 rpm
Clutch Multi-plate, wet, cable operated


3 Speed
Final Drive Chain

Wet Weight

162 kg / 358 lbs

Top Speed

137km/h / 85mph



The Blue Star range was produced between 1932 and 1936. In 1936 a slightly uprated sports version called the BSA Empire Star was launched with the Blue Star remaining in the model range. In 1937 an entirely new engine designed by Val Page featured in the Empire Star and the Blue Star was dropped from the range. The Empire Star developed into the famous Gold Star in 1938 (also known as the M24).
BSA pre war tank logo.jpg

The B33-3 O.H.V. 249cc Blue Star was called the Blue Star Junior and the R33-5 348cc O.H.V. Blue Star was known as the Sporting Blue Star. It was the W33-8 499cc O.H.V. that became the most popular, however, and led to the development of the Gold Star.It was known as the "sea beezer" and it was BSAs fifth best seller.


"250 Bluestar"


"350 Bluestar"