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Production 1971
Class Enduro
air-cooled, four-stroke, single cylinder, OHV
Bore / Stroke 83.8mm x 83.8mm
Compression ratio 10.0:1
Horsepower 34.06 HP (25.4 KW) @ 6200RPM
Torque 28.03 ft/lbs (38.0 Nm) @ 5000RPM
Transmission Gear box: 4-speed, manual

Final Drive: chain

Clutch: wet multi-disc, manual
Suspension Front: telescopic fork
Rear: dual shocks
Brakes Front: drum
Rear: drum
Front Tire 3.25 x 18
Rear Tire 3.5 x 18
Wheelbase 54.02 inches (1372 mm)
Length 85.0 inches (2159 mm)
Width 29.02 inches (737 mm)
Seat Height 32.01 inches (813 mm)
Weight 140.0 kg (wet)
Manuals Service Manual

The BSA B50 MX was a air-cooled, four-stroke, single cylinder, OHV Enduro motorcycle produced by BSA in 1971. Max torque was 28.03 ft/lbs (38.0 Nm) @ 5000 RPM. Claimed horsepower was 34.06 HP (25.4 KW) @ 6200 RPM.


A 83.8mm bore x 83.8mm stroke result in a displacement of just 499.0 cubic centimeters.


The bike has a 4-speed, manual transmission. Power was moderated via the wet multi-disc, manual.


It came with a 3.25 x 18 front tire and a 3.5 x 18 rear tire. Stopping was achieved via drum in the front and a drum in the rear. The front suspension was a telescopic fork while the rear was equipped with a dual shocks. The wheelbase was 54.02 inches (1372 mm) long.

1971 - 1973 BSA B50 MX

1971 - 1973 BSA B50 MX

The 1971 BSA B50 MX sports an air-cooled, four-stroke, 499cc, single cylinder powerplant mated to a four-speed manual transmission and can produce a claimed 34 horsepower and 38 Nm of torque. This off-road machine was one of the most successful moto-cross machines designed by BSA, and had standard fittings such as a single seat, a small fuel tank, wide handlebars, a telescopic front fork coupled to dual shocks as a rear suspension, laced wheels with knobby tires mounted on them, a black steel frame and drum brakes in the front and in the rear.