BSA B40 (1936)

Make Model: BSA B40 / WD40


Year: 1936
Engine: Four stroke, single cylinder, Overhead valve
Capacity: 343 cc / 20.9 cub in
Bore and Stroke: 79 x 70 mm
Compression Ratio: 7.0:1
Oil capacity: 2.8 L / 5.9 US pints
Cooling: Air cooled
Lubrication: Dry sump
Carburetor: Amal 396, 397 or 398
Exhaust: Single
Ignition: Magneto
Battery: 12V, 8Ah
Spark Plug: N4
Starting: Kick starter
Clutch: Multi-plate with cork insert
Max Power: 14.7 kW / 20 hp @ 7000 rpm
Transmission: 4-Speed, foot gearshift
Final Drive: Chain
Gear Ratios: 1st 12.3 / 2nd 9.6 / 3rd 6.9 / 4th 5.8:1
Frame: Full cradle of welded tubular construction
Dimensions: Length: 2100mm / 82.6 in. Width: 750 mm / 29.5 in. Height: 1080 mm / 42.5 in.

Wheel Base: 1360 mm / 53.5 in.
Ground Clearance: 159 mm / 6.3 in.
Seat Height: 813 mm / 32 in.
Steering head angle: 65 degrees
Turning Circle: 4.4 m / 14.5 ft
Front Suspension: telescopic, coil spring, hydraulically damped
Rear Suspension: Swinging fork, coil spring, hydraulically damped units
Front Wheel Travel: 127 mm / 5 in.
Rear Wheel Travel: 70 mm / 2.75 in.
Front Tyre: 3.00 x 18, Trials universal
Rear Tyre: 3.50 x 18, Trials universal
Front Brake: 1.125 x 7 in., mechanical
Rear Brake: 1.125 x 7 in., mechanical
Wet Weight: 165 kg / 364 lbs
Fuel Capacity: 15.9 L / 4.2 US gal
Average Speed: Surfaced road: 88 km/h / 55 mph Cross country: 40 km/h / 25 mph
Average Range (@ 64 km/h / 40 mph): 322 km / 200 miles
Average Consumption (@ 64 km/h / 40 mph): 4.5 L/100 km / 22.2 km/l / 52.2 US mpg
Colour: Defence force green, Plumb, Black, Red
Source: BSA WD B 40


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