BSA B40

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The BSA B40 with telescopic front forks was a modern motorcycle in its day and was used for convoy control, messenger services and the carriage of any small stores, which could be fitted into the pannier bags. The carriage of messages was an important function at a time when radios were few, and less reliable than now. Shepherding road convoys, particularly on major exercises, with the British Army of the Rhine in Germany, was a vital function. Motorcycles ensured that units did not become muddled, as there was often a set time allocation for the use of roads by military traffic with no allowances for losing the way.


Developed from the unit 250cc C15, the B40 350cc single offered greater flexibility and power output without an increase in weight when compared to the smaller engine. The release of a large number of ex military B40's during the early eighties coincided with a growing interest in Pre 65 trials resulting in many of them being modified to trials motorcycles. The B40 continues to be a favorite in the pre 65 trials world and is well supported by specialist suppliers.

1961[edit]

1961 BSA B40


1963[edit]

1963 BSA B40 in Brown
1963 BSA B40 in Brown
1963 BSA B40 in Brown
1963 BSA B40 in Brown
1963 BSA B40 in Brown
1963 BSA B40 in Brown


1964[edit]

1964 BSA B40


1965[edit]

1965 BSA B40F


1967[edit]

1967 BSA B40


External Links[edit]

1961-bsa-b40.jpg
BSA B40
Manufacturer
BSA
Production 1967
Class Classic
Engine
air-cooled, four-stroke, single cylinder, OHV
Bore / Stroke 78.7mm x 78.7mm
Compression ratio 7:1
Top Speed 55 mph
Horsepower 19.98 HP (14.9 KW) @ 7000RPM
Transmission Gear box: 4-speed, manual

Final Drive: chain

Clutch: multi-plate with cork insert
Suspension Front: hydraulic telescopic fork
Rear: dual shocks
Brakes Front: drum
Rear: drum
Front Tire 3.00 x 18
Rear Tire 3.50 x 18
Wheelbase 53.5 inches (1359 mm)
Length 82.72 inches (2101 mm)
Width 29.49 inches (749 mm)
Seat Height 32.01 inches (813 mm)
Weight 165.0 kg (wet)
Manuals Service Manual


The BSA B40 was a air-cooled, four-stroke, single cylinder, OHV Classic motorcycle produced by BSA in 1967. Claimed horsepower was 19.98 HP (14.9 KW) @ 7000 RPM.

Engine[edit]

A 78.7mm bore x 78.7mm stroke result in a displacement of just 343.0 cubic centimeters.

Drive[edit]

The bike has a 4-speed, manual transmission. Power was moderated via the multi-plate with cork insert.

Chassis[edit]

It came with a 3.00 x 18 front tire and a 3.50 x 18 rear tire. Stopping was achieved via drum in the front and a drum in the rear. The front suspension was a hydraulic telescopic fork while the rear was equipped with a dual shocks. The wheelbase was 53.5 inches (1359 mm) long.

1967 BSA B40[edit]

1967 BSA B40 1967 BSA B40 1967 BSA B40

The 1966 BSA B40 sports an air-cooled, four-stroke, 343cc, single cylinder powerhouse mated to a four-speed manual transmission with a foot-operated gear-shift and can produce a claimed 20 horsepower at 7000 rpm.

In addition, it comes standard with a dual seat, a large headlight, a center stand, mid-mounted foot pegs, a hydraulic telescopic fork, laced wheels, a 16-liter (4.2-gallon) fuel tank, a drum braking system in the front and in the rear, dual shocks as a rear suspension and a small tail-light.


In Media[edit]