BSA B34500 Gold Star Clubman

BSA B34500 Gold Star Clubman
Manufacturer	BSA
Production	1954 - 70
Engine	Four stroke, single cylinder, Overhead valve
Compression ratio	8.0:1
Top Speed	177 km/h / 110 mph
Ignition	Lucas magdyno, 6V
Transmission	4-Speed manual
Suspension	Front: Telescopic fork Rear: Swinging arm with twin shock absorbers and dampers
Front Tire	3.00 x 19 in
Rear Tire	3.50 x 19 in
Wheelbase	1400 mm / 56 in
Seat Height	770 mm / 30.5 in
Weight	171 kg / 384 lbs (dry),
Fuel Capacity	18 L / 4.8 US gal
Manuals	Service Manual

It could reach a top speed of 177 km/h / 110 mph.

Engine

The engine was a Air cooled cooled Four stroke, single cylinder, Overhead valve. The engine featured a 8.0:1 compression ratio.

Drive

Power was moderated via the Wet, Multi-plate.

Chassis

It came with a 3.00 x 19 in front tire and a 3.50 x 19 in rear tire. The front suspension was a Telescopic fork while the rear was equipped with a Swinging arm with twin shock absorbers and dampers. The B34500 Gold Star Clubman was fitted with a 18 L / 4.8 US gal fuel tank. The bike weighed just 171 kg / 384 lbs. The wheelbase was 1400 mm / 56 in long.

Photos

Overview

BSA B34 Gold Star Clubman

The BSA Gold Star was made from 1938–1963. They were 350 cc and 500 cc single-cylinder four-stroke production motorcycles known for being amongst the fastest bikes of the 1950s. Being hand built and with many optional performance modifications available, each motorcycle came from the factory with documented dynamometer test results, allowing the new owner to see the horsepower produced.

In 1937, Wal Handley lapped the Brooklands circuit at over 100 mph (160 km/h) 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 model. It had an alloy 496 cc engine, an Electron alloy gearbox, and a light tube frame devoid of sidecar attachment lugs. This model continued up to the start of World War II.

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 engine bench tested. They were 20 lb (9.1 kg) lighter than the comparable cast iron barrel and head B series single. They were successful in the 350 class from 1949 to 1956. They could be specified in tourer, trials, ISDT, scrambles, racing or Clubmans trim. The YB is taken from the beginning of the engine number – YB is 1948, ZB is 1949.

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 swingarm duplex frame was introduced, along with an improved gearbox.

1954 CB34 and CB32 An optional CB engine was given more and squarer finning, a stronger crankshaft, a shorter connecting rod, oval flywheels (500), improved valve gear, and an Amal GP carburetor.

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 500 cc DBD34 was introduced in 1956, with clip-on handlebars, finned alloy engine, polished tank, 36 mm bell-mouth Amal carburetor and swept-back exhaust. The DBD34 had a 110 mph (180 km/h) top speed.[citation needed] The Gold Star dominated the Isle of Man Clubmans TT that year. Later models had a very high first gear, enabling 60 mph (97 km/h) plus before changing up to second. Production ended in 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. Alternator models continued to be sold until 1961 as GB33. The demise of the Lucas magneto was a prime reason that BSA and Triumph reconfigured their pre-unit-construction parallel twins into engines with integral gearboxes, simultaneously converting the ignition system from magneto to battery & coil. The Gold Star was not considered for progression to unit-construction, and instead the 250 cc BSA C15 was developed (via the B40) into the 500 cc B50. Although the B50 never attained the kudos of the DBD34, a B50 fielded by Mead & Tomkinson once held the class lap record in the Production TT, as well as gaining results at the 24-hour endurance races the Le Mans Bol d'Or and at the Montjuïc circuit in Barcelona. CCM used BSA B50 bottom ends in their early specials.

On Wednesday 30th June 1937, a specially prepared Empire Star 500 ridden by the great Wal Handley achieved a 100mph lap of the Brooklands circuit on its way to a debut race victory and award of the 'Gold Star' that would give BSA's new super sports model its evocative name. Possibly the most successful production racing motorcycle ever, the post-war Gold Star formed the mainstay of clubman's racing in the 1950s. In fact, it was the model's domination of the Isle of Man Clubman's TT which led to the event being dropped after Gold Star rider Bernard Codd's 1956 Senior/Junior double victory. While its trials and scrambles derivatives demonstrated the design's versatility by chalking up an equally impressive record in off-road competition, for the majority of enthusiasts the 500cc DBD34 in Clubman's trim is the epitome of the 'Goldie'. The DBD, the ultimate road going 500 Gold Star, appeared in 1956 when the famous RRT2 close-ratio gearbox and 190mm front brake became standard equipment. From then on BSA's perennially popular sporting single changed little until its much lamented demise in 1963. Today, the Gold Star remains one of the most highly sought after of post-war British motorcycles and is supported by a most enthusiastic owners' club.

Make Model	BSA B34 Gold Star Clubman
Year	1954 - 70
Engine Type	Four stroke, single cylinder, Overhead valve
Displacement	499 cc / 30.5 cub in.
Bore X Stroke	85 x 88 mm
Compression	8.0:1
Cooling System	Air cooled
Lubrication	Dry sump
Exhaust	Single, stainless steel and chrome
Carburetor	Single Amal Monobloc
Ignition	Lucas magdyno, 6V
Starting	Kick start
Clutch	Wet, Multi-plate
Maximum Power	28.3 kW / 38 hp @ 7000 rpm
Transmission	4-Speed manual
Final Drive	Chain
Wheelbase	1400 mm / 56 in
Seat Height	770 mm / 30.5 in
Front Wheel	WM3 x 19 in
Rear Wheel	WM3 x 19 in
Front Tire	3.00 x 19 in
Rear Tire	3.50 x 19 in
Front Suspension	Telescopic fork
Rear Suspension	Swinging arm with twin shock absorbers and dampers
Front Brake	8 in, drum
Rear Brake	7 in, drum
Dry Weight	171 kg / 384 lbs
Fuel Capacity	18 L / 4.8 US gal
Top Speed	177 km/h / 110 mph
Colours	Black/chrome
Source	Wikipedia, Bonhams

External Links

• http://www.bohams.com/