1971 BSA B50SS


1971 BSA B50 SS

1971 BSA B50SS BACKGROUND
The “SS” stands for “Street Scrambler”, and was intended as the full street version of the 500cc single-cylinder B50 line. BSA dipped into its parts bin, borrowing from the 1971-and-later BSA A65 for the front forks, triple clamps, brakes and lighting. All of this was added to the B50’s sturdy frame, which utilized a large-diameter backbone for both strength and to hold the engine oil, in lieu of a separate oil tank. A very shapely 2.4-gallon tank with a top-notch paint job topped of what was a very handsome machine. Some other things were done right too, like all the electrics being contained in one removable pod. The B50 in factory-racing form and bearing the hallowed name of “Gold Star”, earned some racing cred in the early 70s by winning the Thruxton 500, the Barcelona 24-hour, the Zolder 24-hour, and set a class lap record at the Isle of Man TT.


1971 BSA B50SS SPECIFICATIONS

Engine type
Displacement
Bore & Stroke
Compression ratio
Carburetor
Ignition
Horsepower output
Torque output
Primary drive
Clutch
Gearbox
Final drive
Battery
Frame type
Suspension, front
Suspension, rear
Brake, front
Brake, rear
Tire, front
Tire, rear
Wheelbase
Length
Width
Height
Ground Clearance
Seat Height
Dry Weight
Air-cooled OHV 4-stroke single
499cc / 30.5 ci
84mm X 90mm
10.0:1
Amal 930/62
Lucas RM21 points & coil
34 hp @ 6200 rpm
28 lb/ft @ 5000 rpm
Chain
Multi-plate, wet
4-speed, right-foot shift
Chain
12 volt
Welded steel tubing, oil-in-backbone
Telescopic forks, hydraulic damping
Swing arm w/2 shock coil-over shocks
8-inch TLS drum, conical hub
7-inch SLS drum, conical hub
3.25″ X 18″
3.50″ X 18″
54.0 in / 1372mm
85.0 in / 2159mm
29.0 in / 737mm
43.5 in / 1105mm
7.0 in / 178mm
32.0 in / 813mm
310 lbs / 140.6 kg

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