Featured Pages Matchless Flat Twin 1916 An Outstanding Design by Harry Collier
Matchless 732cc HO TwinClement Ader The Stuff of Legend
Pioneer in Telephony, Aviation and Motorcycling
Moteurs AderGuzzi's Grandpa A shaft-drive transverse V-twin from 1904, another deft touch from Clement Ader.
Built from 1938 to 1963 with 350cc and 500cc single-cylinder engines.
The BSA Gold Star, (1938- 1963), is a 350 cc and 500 cc 4-stroke production
motorcycle that gained its reputation for being one of the fastest machines
of the 1950s. These motorcycles were popular for their high performance.
Besides being hand built, with many optional performance modifications
available, they came from the factory with documented dynamometer test
results, allowing the new owner to see the horsepower produced.
In 1937, Wal Handley lapped Brooklands at over 100 mph on a BSA Empire
Star, and was awarded one of the traditional Gold Star pins for the feat.
That inspired BSA to produce the BSA Gold Star.
The first Gold Star was an M24. It had an alloy 496 cc engine, an Electron
alloy gearbox, and a light tube frame devoid of side-car lugs. This model
continued up till the War.
1948 YB32. After the war the all alloy 348 cc B32 Gold Star was released,
with a very large list of optional components. Once ordered the bike was
assembled by hand, and the motor bench tested. They were 20 lb lighter
than the comparable cast iron barrel and head B-series single. They were
very successful in the 350 class from 1949 to 1956. They could be specified
in tourer, trials, ISDT, scrambles, racing or Clubmans trim. The ZB is
taken from the beginning of the engine number. ZB is actually 1949, YB
1949 ZB34. The 499 cc B34 Gold Star had a modified crankshaft and a different
design main bearing. The 350 continued.
In 1950 both received larger front brakes.
In 1952 the 500 gets a new Bert Hopwood design head, and the 350 had a
new head of that design the following year.
1953 BB34 and BB32. In 1953 a swing-arm duplex frame is introduced, along
with an improved gearbox.
1954 CB34 and CB32. An optional CB motor was given more and squarer finning,
stronger crank, a shorter conrod, oval flywheels (500), improved valve
gear, and an Amal GP carb.
1955 DB34. The DB Gold Star had an improved oil feed to the crankshaft,
and finned front brakes. If the buyer specified Clubman cams and timing,
he also received a special silencer. At the end of this year the BB and
CB models were discontinued.
1956 DBD34. The most prized model was the 500 cc DBD34 introduced in 1956,
with clip-on handlebars, finned alloy engine, polished tank, 36 mm bell-mouth
Amal carburettor and swept-back exhaust. The DBD34 had a 110 mph top speed.
The Gold Star dominated the Isle of Man Clubmans TT that year. Later models
had a very high first Gear, enabling 60 mph plus before changing up to
1963 End of production. Towards the end the Gold Star was only offered
in scrambles, or Clubmans trim. In 1963 Lucas ceased to produce the magneto
used in the B series, and that line of singles was ended. A sporting single
was not produced again till the BSA B50 models that were produced from
1971 through 1973. Some remaindered stock were marketed in 1974 as Triumphs,
and later CCM used BSA B50 bottom ends in their early specials.