BSA Gold Star DBD34 Clubman

Buyers guide Part 1

 


BSA BB, CB and ZB Gold Stars

1956 BSA DBD34 Gold Star Specifications

DBD34 Goldies

RRT2 gearbox

Buyer/ownership tips

BSA Gold Star chronology

Top specialists and links


BSA Gold Star tank badge

1956 BSA DBD34 Gold Star Specifications

Type: Air-cooled OHV single

Capacity: 499cc (500cc)

Bore & Stroke: 85mm x 88mm

BHP: 42 @ 7000rpm

Compression ratio: 8.75:1

Transmission: 4-speed, multi-plate

wet clutch

Brakes: 8-inch front, 7-inch rear

Electrics: 6-volt, magdyno

Front suspension: Telescopic

Rear suspension: Swinging arm,

twin shock absorbers/dampers

Wheels/Tyres: 3.00 x 19-inch front,

3.50 x 19 rear

Weight: 384lbs (dry)

Maximum speed: 110mph

 


BSA DBD34 Gold Star Clubman timing side

 

BSA DBD34 Gold Star Clubman, clip on bars

 

500cc BSA B34 Gold Star


BSA Gold Star chronology

 

1937 M23 Empire Star

1938 M24 Gold Star

1939 M23 Silver Star

1949 ZB Gold Star

1953 BB Gold Star

1954 CB Gold Star

1955 DB Gold Star

1956 DBD Gold Star

1963 Last production DBD Gold Star


 

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BSA Gold Star metal Sign

 

BSA DB Gold Star metal sign

 

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WHEN THE DBD34 CLUBMAN GOLD STAR  was launched in 1956, BSA must have known even then that the bike was nearing the end of its reign, both commercially and technically speaking. The company had, after all, done just about everything to its Gold Star predecessors that it was possible to do. And in this, its final (and arguably best) incarnation, it had become so highly strung that you needed to be a violinist to play it.

Which, naturally, didn’t stop a lot of ordinary less-musical guys from trying; guys who knew that when these temperamental, uncompromising, two-wheeled, testosterone hot-rods were on song, there was little else on the street, track or dirt to touch them.

With its race proven pedigree and that legendary Gold Star exhaust ‘twitter’, the 110mph, 384lb DBD34 was to motorcycling what Arnold Schwarzenegger is to politics.

Meaning lean, mean, brash and loud.

 

Lucas magnetos

 

It was a superlative machine that, ultimately, was to become something of a victim of its own success. Which was why by 1963 it was deemed too expensive (and time-consuming) to build, too anti-social too countenance, too hot to handle—and generally out of step with the current vogue for twins and lightweights, which was where BSA saw its industrial future. Moreover, for all its improvements it was (understandably) becoming less and less competitive against the Triumph and Norton twins of the day.

Additionally, it's often said that the Gold Star was scrapped largely because Lucas stopped producing magnetos—which sounds an unlikely excuse in view of the other ignition options available at the time. More likely, BSA simply recognised that it was chasing an increasing share of a shrinking market and took the quick exit when Joe Lucas held open a convenient door.

Either way, the Goldie was scrapped and shunted aside in favour of the new ‘C’ series lightweight kids on the block. And because, like Elvis, it died a sudden death before it had outgrown its appeal, its classic status was ... well, enshrined in gold.

Nowadays, the fortunes of this classic street hooligan— following a few years in the doldrums—are climbing again. The wheel of fashion has gone full circle, and big money appears to be changing hands for genuine—and sometimes fake—machines. But the Gold Star market had been a curiously volatile one, so take care not to mistake a blip for a trend.

If you’re seriously thinking of buying one, take a tip and get yourself a health check before you book that test ride (notably around the left wrist and the right ankle, and pretty much everything in between). Because ownership of a DBD34 Gold Star, with all its quirks and foibles, is nothing if not a challenging experience.

 

BSA DBD34 Gold Star intruments

 

BSA BB, CB, and ZB Gold Stars

 

BSA had lit the Gold Star fuse as far back as 1937 when Wal Handley lapped the famous Brooklands race track in Surrey at over 100mph. He was riding an M23 Empire Star. BSA, quick to capitalise on that achievement, hurriedly released an M24 Gold Star.

The engines of these early Goldie were heavily worked-over; a time-consuming and therefore expensive process which included polished ports, conrod and crankcases. Then the motors were dyno tested and certified as being not merely warm but hot.

Riders of the day quickly seized the opportunity that BSA had presented and, with great success, began campaigning Goldies.

And then the war.

Post hostilities, BSA produced a B31 348cc single (1945), a B32 350cc single primarily for the trials market (1946), a B33 500cc for sidecar and touring (1947), and another competition model, the B34 (1947).

In 1949, the (348cc) B32 became available as a B32GS, "GS" for Gold Star; a package that included an alloy top-end. The same year, the B34 got the Gold Star treatment.

The aforementioned (348cc) B32 Gold Star soon became referred to as the ZB type, which in turn prompted a more muscle bound stablemate; the ZB34 Goldie (499cc).

These bikes, note, were still being built around plunger frames. But that changed in 1953 when the swinging arm models made their first appearance. This was the arrival of the BB Gold Stars.

In 1954, the big-finned Goldies, known as the CB models, arrived on the scene, and the DB upgrade appeared in 1955.

 

 

DBD34 Goldies

 

Complicated? You bet. With all the changes and options, it's a wonder any potential customer could stay awake long enough to make up his or her mind as which bike to buy. Regardless, the 350 and 500 Gold Stars (of all types) had been knocking out most of the competition—even in the hands of average clubman racers—and looked set to continue for some time to come.

A wide range of camshafts, gearsets, compression ratios, exhausts and other components gave these awesome BSAs a distinct competition edge and refined the package to the nth degree. Which meant that by the time the (final) 1956 DBD34 appeared on the drawing board (which, incidentally, dominated the Clubman TT of that same year), there wasn’t much about the fundamental architecture of the bike that the company didn’t understand. What prevented further development beyond the DBD envelope was nothing other than commercial expediency underpinned by, amongst other things, the law of diminishing returns.

At the heart of the beast was an all-aluminium, single-cylinder 39bhp-42bhp, OHV, timebomb. Two valves, two pushrods and one heavily breathed on high compression (8.75:1) piston were all that was needed to propel this bike from zero revolutions to around 7000rpm—with maximum power coming in at 6500rpm (figures from Gold Star specialist Phil Pearson). But remember: Each bike is different, which means that they'll dial in different numbers with a potential detonation point at varying positions on the rev counter.

With an 85mm bore and an 88mm stroke, the next key ingredient—some would argue the main ingredient—in this fantastic motorcycling adventure was the massive 1-1/2-inch Amal GP carburettor which sucked fuel like a 747 and spat the burnt mixture through the now legendary Gold Star megaphone.

 

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