The Evolution of the Marston Sunbeam Motorcycle

These pages show some of the development of the Sunbeam over the years from 1907 to 1938 broken down by models and configuration

The 350 Side Valves

  • 2¾ hp(1912-1914) 349cc
  • (1912-1914) 349cc
  • Models 1 & 2

The 500 Side Valves

  • 3½ HP Standard, TT , Light Solo, Sporting, Semi-sporting, Model 3, Model 5, B29 (1913-1926) 499cc
  • 3½ HP Longstroke, Light Solo, Light Tourist, TT, Model 5,
  • Model 6, B29, Lion (1922-1939) 492cc

The 600 Side Valves

  • 41/4 HP, Model 4, Model 7, B30, Lion Longstroke, B30 (1922-1939) 598cc
  • 4HP, French Military Model (1916-1918) 550cc

The 250 OHVs

  • 250 Longstroke, Model 14, 14SS (Semi sports),
  • 14s (Sports) Little 90, Little 95, (1933-1938)
  • 246cc Model 16 (1935) 248cc

The 350 OHVs

  • The 350 OHV Model 8
  • Model 8, 10 ,11
  • TT Model 80

The 500 OHVs

  • The 500 OHV Model 9
  • TT, Model 11, Sprint, TT Model 90, Model 95, 95L, 95R, M9 Sports,
  • (1924-1938) 493cc
  • B25, B25s, B25T, C25 (1929-1940) 498cc

The 600 OHVs

  • Model 9A (1932-1938)
  • 596cc B28,C28
  • (1939-1940) 598cc

The JAP, AKD & Mag V twins 650cc to 996cc

  • 6 hp (JAP or AKD) (1914-1916)
  • 8 hp (JAP or MAG) 996cc -twin (1916-1923)
  • 5 hp (JAP) Russian 650cc -twin

Latest Work
As you can see there is still a fair bit more to do, if you can contribute to these pages we would love to hear from you, please contact