BSA rocket

General information
Model:	BSA A 75 Rocket 3
Year:	1971
Category:	Classic
Rating:	71.3 out of 100. Show full rating and compare with other bikes
Engine and transmission
Displacement:	740.00 ccm (45.15 cubic inches)
Engine type:	In-line three, four-stroke
Power:	58.00 HP (42.3 kW)) @ 7500 RPM
Top speed:	185.0 km/h (115.0 mph)
Compression:	9.5:1
Bore x stroke:	67.0 x 70.0 mm (2.6 x 2.8 inches)
Valves per cylinder:	2
Fuel control:	OHV
Cooling system:	Air
Gearbox:	4-speed
Transmission type, final drive:	Chain
Chassis, suspension, brakes and wheels
Front tyre dimensions:	4.00-19
Rear tyre dimensions:	4.00-19
Front brakes:	Expanding brake
Rear brakes:	Expanding brake
Physical measures and capacities
Weight incl. oil, gas, etc:	226.0 kg (498.2 pounds)
Fuel capacity:	19.00 litres (5.02 gallons)
Other specifications
Further information
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BB 31 (1953)

• Manufacturer: BSA
• Model: BB 31
• Engine: 350 cc
• Year: 1953
• Decade: 1950s
• Machine Type: Custom/Special

The BSA B31, introduced in 1945, is the first new model introduced by the company after the Second World War. Based on the design before the war, it uses four-stroke single cylinder engine displaced 348 cc (21.2 cu in). Initially, the rigid frame and telescopic forks, the first such use of the BSA. It was developed around 17 bhp (13 kW), enough for the streets day and enough to give a top speed of about 70 mph (110 km / h). It was immediately popular and was soon joined by 500 cc (31 cu in) version, and equal competition BSA B33, BSA and BSA B32 B34, next version of the car, with stiffer suspension and different end demultiplication, known as BB31.

Plunger rear suspension offered later, with a frame suspension Rear suspension is available from 1954. This model continued in production until 1959, when Lucas magdyno which traditionally has been replaced by an alternator and ignition coil.

Series B extended through his life to enter the famous BSA Gold Star, and the bottom half of all engines have many similarities with the model of the valve series M. The M33, designed to work side by side, the M series combined a strong frame and perform better on the valve 500 cc B33.

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Technical information M24 Gold Star

General data

Engine:  Single port, 496cc OHV single cylinder.  
               Bore 82mm,  Stroke 94mm.              
               Compression ratio 7.75:1
                     (Option of 12.5:1 with High Compression Piston)             
               Power output 29-30bhp @ 5,800rpm             
               Alloy cylinder head with cast-in bronze thread inserts, and
               screwed-in steel valve seats.              
               Alloy cylinder barrel with pressed-in steel liner
Valves:  Inlet: length 4.21875in Head Dia 1.65625in Stem Dia 0.34375in
               Exh: length 4.21875in  Head Dia 1.59375in Stem Dia 0.375in                

Ignition: Lucas MO1 Magdyno with manual advance.

                Ignition timing 7/16in BTDC on full advance.

Carburettor: 1938:  Amal 10TT36 1 & 5/32” bore, Main Jet 370,
                                   Throttle valve 5, needle groove 4                                  1939:  Amal 10TT38 1 & 5/32” bore, Main Jet 350,
                                   Throttlevalve  6, needle groove 4
Transmission:
Gearbox: 4-speed,  enclosed footchange, external clutch release lever
               
                 Magnesium Alloy (Elektron) gearbox cases for 1938 only              
                 Close-ratio gears for 1939, with option of standard wider ratios                   Ratios: 1938 & 1939 standard: 
                               1^st   14.3:1  2^nd   9.9:1  3^rd    6.3:1   4^th    4.8:1                     
                              1939 Close ratio:  
                               1^st  11.85:1    2^nd   8.3:1   3^rd  5.25:1   4^th  4.8:1
                Clutch: 6-spring multiplate with 43 tooth chain wheel,
              driven by ½ x .305in single row primary chain from 21 tooth  
              cush-drive engine sprocket. 18 tooth gearbox sprocket,
              driving 42 tooth rear wheel sprocket via 5/8 x 1/4in. final drive chain.
Frame: Reynold 531 high-tensile tube.  Single front down tube, rigid rear,
              BSA girder front forks.
Wheels:  20in WM1front, (21in WM1 on Competition Model), 19in WM2 rear.

Tyres  Front 3.00 x 20in,   Rear 3.25 x 19 (1938),  3.50 x 19 (1939)
Brakes:  7in Single LS drum brakes front & rear.

Petrol Tank Capacity: 3 Gal. (1938)  3.5 Gal. (1939)
Oil Tank Capacity:  4 pints (1938)   5 pints (1939)
Wheelbase: 54in
Saddle Height: 28.5in
Ground clearance: 4 .625in    
Dry weight: 345lb 1938 & 1939         

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M24 Gold Star (1930s)

• Manufacturer: BSA
• Model: M24 Gold Star
• Engine: 496cc OHV
• Year: 1938
• Decade: 1930s
• Machine Type: Road

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B33 (1950s)

 

• Manufacturer: BSA
• Model: B33
• Engine: 500cc
• Year: 1953
• Decade: 1950s
• Machine Type: Road

B33's, for those of you not so familiar with it, is the big brother to the post-war BSA B31. The B31 runs dimensions 88mm x 71mm while the larger engine gave birth to B33 to 85mm x 88mm is almost square. 500cc bike get a wider rear tire, flywheel weight and a larger inlet valves, but otherwise much the same as 350. Then there B34 - competition engine with a high gear ratio, which gave birth to the legend that is DBD34 and Gold Star. But back in 1949 or more, rigid 23bhp B33, as B31, welcome to a light clutch, smooth on other equipment, melodious exhaust note and reasonable prices. This bike was, according to Owen Wright; 'handsome, well-balanced and they played with spirit. "

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C 15 (1965)

 

• Manufacturer: bsa
• Model: c15
• Engine: 249cc
• Year: 1965
• Decade: 1960s
• Machine Type: Road

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B25 fleetstar (1970s)

 

• Manufacturer: BSA
• Model: B25 fleetstar
• Engine: 250cc single
• Year:
• Decade: 1970s
• Machine Type: Road

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Y13 (1936)

 

• Manufacturer: BSA
• Model: Y13
• Engine: 750cc V Twin
• Year: 1936
• Decade: 1930s
• Machine Type: Sidecar

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BSA 1921 Model-A

Manufacturer	BSA
Also called	Type A
Production	1919-1924
Engine	770cc side valve vertical twin
Power	6hp
Transmission	Three speed to chain final drive

Once submitted to the production of weapons for the First World War the BSA back into motorcycle production longer sold as affordable with a reasonable performance for the average user. BSA emphasizes the reliability of their machines, parts availability and dealer support. BSA Model E is the first of a series of successful twin V [1] is based around a 770cc side valve engine with cylinder reliable at an angle of 50 degrees. The simple 6hp generated by the machine is capable of providing a top speed of 55mph and has its own design BSA three-speed gearbox with chain drive is enclosed in an aluminum casing. There is increasing demand for affordable transportation after the end of the war and the Model E has become popular with matching green BSA and sidecar painted cream choices.

Designed for easy servicing valve tappets have been exchanged and quickly adjusted. Constant loss of oil pumps are equipped with hand-operated pump and wheels are also quickly removed and the same size so they are interchangeable.

Although the BSA Model E was produced until 1924 has been replaced by the more powerful Model F 986cc in 1922, which continues in production as the Model G BSA, with modifications constantly, until after the outbreak of World War II.

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