BSA B50SS, T & MX (1971-73)

Make Model: BSA B50SS, B50T, B50 MX


Year: 1971 – 73
Production: 5700 units
Engine: Four stroke, single cylinder, OHV, 2 valve
Capacity: 499 cc / 30.5 cub in.
Bore x Stroke: 84 x 90 mm
Carburettors: B50 SS & T Amal R930/62 B50 MX (71-72) Amal R932/18, (73) Amal R932/28
Cooling System: Air cooled
Compression Ratio: 10.0:1
Lubrication: Wet sump
Engine Oil: SAE 20W/50
Oil Capacity: 3.4 L / 6 pints / 0.9 US gal
Exhaust: Single, chrome plated
Ignition: Lucas RM21
Spark Plug: Champion N4
Battery: 12V
Starting: Kick
Max Power: 25 kW / 34 hp @ 6200 rpm
Max Torque: 37.9 Nm / 3.86 kgf-m / 28 ft/lb @ 5000 rpm
Clutch: Multi-plate, wet, cable operated
Transmission: 4 Speed
Final Drive: Chain

Frame: Welded frame with larger diameter top tube for strength
Front Suspension: Telescopic forks
Rear Suspension: Swing arm, 2 shocks wiith dampers
Front Brakes: 8 in. drum, leading shoewith snail cam shoe adjustment
Rear Brakes: 7 in. drum with floating cams
Wheels: Steel, spokes
Front Tyre: SS & MX: 3.25 x 18 in. T: 3.00 x 20 in. Trials
Rear Tyre: SS & MX: 3.5 x 18 in. T: 4.00 x 19 in. Trials
Dimensions: Length: 2159 mm / 85.0 in. Width: 737 mm / 29.0 in. Height: 1105 mm / 43.5 in
Wheelbase: 1372 mm / 54 in.
Ground Clearance: SS & MX: 178 mm / 7 in. T: 191 mm / 7.5 in.
Seat Height: 813 mm / 32 in.
Dry Weight: B50SS & MX: 140.6 kg / 310 lbs B50 T: 135.0 kg / 298 lbs
Wet Weight: 184 kg / 406 lbs
Fuel Capacity: UK: 18.2 L / 4.8 US gal US: 9.1 L / 2.4 US gal
Standing 0 – 100 km/h / 62 mph: 7.4 sec (B50SS model)
Top Speed: B50SS: 160 km/h / 99 mph B50T & MX: 145 km/h / 90 mph
Review: Sump publishing


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