1939 BSA Silver Star

1939 BSA SILVER STAR BACKGROUND
The brilliant engineer Val Page designed BSA's new 500 single in 1937, while at the same time bringing some rationale to BSA's complex product lineup. It was now made up of 250 and 350 singles in what was called the "B-class", and the top-of-the-line 500 heavyweight class was divided into 3 groups itself. The M22 was the 'cooking version' (ie: the entry-level commuter); the M23 Silver Star was the sports machine and it had a specially-tuned engine with a higher output than the M22; and the M24 Gold Star which was really a street-legal race bike. Val Page included several innovative and modern features in these new machines. The forged steel backbone of the previous models was replaced by a brazed steel tubular frame with a single backbone. The sump in the crankcase was discontinued, and the mag-dyno was moved to the rear of the cylinder and driven by a chain from the right side. But the big news was the full enclosure of the top end valve gear.

1939 BSA Silver Star SPECIFICATIONS

Engine type:

Displacement:

Bore & Stroke:

Fuel system:

Ignition system:

Lubrication system:

Charging system:

Primary drive:

Clutch:

Gearbox:

Gearbox ratios:

Final drive:

Suspension, front:

Suspension, rear:

Brake, front:

Brake, rear:

Tire, front:

Tire, rear:

Fuel capacity:

Wheelbase:

Seat height:

Ground clearance:

Air-cooled OHV single

496cc

82mm X 94mm

1X Amal carburetor

Lucas mag-dyno

Dry sump

Lucas mag-dyno & 6-volt battery

1/2" X .305 Chain

Multi-plate, wet w/cush drive

4-speed, right-foot shift

4.8:1; 5.2:1; 8.15:1; 11.8:1

Chain

Girder fork

Rigid

7" SLS drum

7" SLS drum

3.00" X 20" Dunlop Universal

3.50" X 19" Dunlop Universal

3.5 gallons

54.0"

28.5"

4.5"


Check out these BSA BOOKS

BSA - THE COMPLETE STORY


BSA MOTORCYCLES: THE FINAL EVOLUTION


HISTORY OF BSA MOTORCYCLES


BSA: ILLUSTRATED MOTORCYCLE LEGENDS, by Roy Bacon


HOW TO RESTORE YOUR BSA ROCKET 3 & TRIDENT


CHILTON’S BSA MOTORCYCLE REPAIR & TUNE-UP GUIDE


BSA SINGLES 1945-1963 GOLD PORTFOLIO


BSA SINGLES 1964-1974 GOLD PORTFOLIO


BOOK OF THE BSA - OWNERS SHOP MA NUAL, PRE-WAR


BSA 350, 441 & 500 SINGLES, UNIT CONSTRUCTION 1958-1973


BSA CLASSIC MOTORCYCLES


BSA & TRIUMPH TRIPLES: GOLD PORTFOLIO 1968-1976


BSA UNIT SINGLES: COMPLETE STORY


BSA A7 & A10 TWINS, 1957-1962, by Haynes


BSA A50 & A65 TWINS: ALL MODELS


ILLUSTRATED HISTORY OF BSA MOTORCYCLES


BSA TWINS A7 & A10 1946-1962, GOLD PORTFOLIO


THE BSA GOLD STAR


MAINTENANCE MANUAL FOR BSA M20


SECOND BOOK OF THE BSA 500 & 650 TWIN 1962-1969


BSA PRE-UNIT SINGLES WORKSHOP MANUAL, by Haynes


TRIUMPH TRIDENT & BSA ROCKET 3 WORKSHOP MANUAL, by Haynes


BSA BANTAM WORKSHOP MANUAL 1948-1971, by Haynes


BSA UNIT TWINS, THE COMPLETE STORY


BOOK OF BSA SINGLES & V-TWINS 1936-1952


RUPERT RATIO UNIT SINGLE ENGINE MANUAL, BSA & TRIUMPH


RUPER RATIO, EVERYTHING BUT THE ENGINE, BSA & TRIUMPH


BSA A50 & A65 TWINS 1962-1973, Haynes Workshop Manual


BSA GOLD STAR & OTHER SINGLES, by Roy Bacon


BSA MOTORCYCLES SINCE 1950,BR>

BSA UNIT SINGLES OWNERS WORKSHOP MANUAL #127, 1958-1972, by Haynes


BSA TWINS 150 & 165 GOLD PORTFOLIO, by RM Clarke


ILLUSTRATED BSA BUYER’S GUIDE, by Roy Bacon


BSA BANTAM, by Owen Wright


BSA PRE-UNIT TWINS, by Mick Walker


BOOK OF THE BSA OHV & SV SINGLES - 250cc 1954-1970


BSA TWINS & TRIPLES, by Roy Bacon


TRIUMPH & BSA TRIPLES: THE COMPLETE STORY


BOOK OF BSA TWINS, ALL 500 & 650 1948-1962, by Floyd Clymer


BOOK OF THE BSA OHV & SV SINGLES 1945-1954: 250, 350, 500 & 600


BSA BANTAM BIBLE, ALL MODELS 1948-1971


WHERE BSAs DARE: BSA’s 1952 ISDT GOLDS & MAUDES TROPHY


ILLUSTRATED MOTORCYCLE LEGENDS: BSA, by Roy Bacon


BSA BANTAM ESSENTIAL BUYER’S GUIDE


BOOK OF THE BSA BANTAM


BSA 500 & 650 UNIT TWINS, Clymer Repair Manual


BSA COMPETITION HISTORY


BSA MOTOR CYCLING ANNUAL, 1937, Kindle






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