Categories: BSA

BSA DBD34 (1938-63)

The BSA DBD34 Gold Star 500 was a popular motorcycle model produced from 1938 to 1963. It has a four-stroke, single-cylinder, overhead valve engine with a 499cc capacity and an 85 x 88 mm bore and stroke. The compression ratio is 9.0:1, and the cooling system is air-cooled. It features an Amal GP carburetor and a single, steel, chrome exhaust. Ignition is 6V with a magneto, and starting is done by a kick start. The clutch is wet, multi-plate, and the transmission is four-speed with a final drive chain. The maximum power is 31 kW or 42 hp at 7000rpm. The frame is tubular steel with twin downtubes, and the front suspension is telescopic forks while the rear suspension is a swinging arm with twin shock absorbers. The spoked wheels are alloy, with a front tire of 3.0 x 19 in. and a rear tire of 3.5 x 19 in. The front and rear brakes are 7.5 in. and 7.0 in. respectively, both featuring single-leading-shoe drums. The wheelbase is 1422 mm or 56 in., with a seat height of 787 mm or 31 in. The dry weight is 172 kg or 380 lbs, with a fuel capacity of 18 L or 4.8 US gal. It averages 5.7 L/100 km or 17.7 km/l or 41.6 US mpg and has a top speed of 177 km/h or 110 mph.


Technical specifications:

Make Model: BSA DBD34 Gold Star 500

Year: 1938 – 63

Engine: Four stroke, single cylinder, OHV

Capacity: 499 cc / 30.5 cub in.



Bore and Stroke: 85 x 88 mm

Compression Ratio: 9.0:1

Cooling System: Air cooled

Carburetor: Amal GP

Exhaust: Single, steel, chrome

Ignition: 6V, magneto

Starting: Kick start

Clutch: Wet, multi-plate

Transmission: 4-Speed

Final Drive: Chain

Maximum Power: 31 kW / 42 hp @ 7000 rpm

Frame: Tubular steel, twin downtube

Front Suspension: Telescopic forks


Rear Suspension: Swinging arm, twin shock

Wheels: Spoked, allloy

Front Tyre: 3.0 x 19 in.

Rear Tyre: 3.5 x 19 in.

Front Brake: 7.5 in., sls drum

Rear Brake: 7.0 in., sls drum

Wheelbase: 1422 mm / 56 in.

Seat Height: 787 mm / 31 in.

Dry Weight: 172 kg / 380 lbs

Fuel Capacity: 18 L / 4.8 US gal.


Average Fuel Consumption: 5.7 L/100 km / 17.7 km/l / 41.6 US mpg

Top Speed: 177 km/h / 110 mph
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