BSA A7 Star Twin/Shooting Star SPECIFICATIONS, PRICE & IMAGES

Bike Features

Make Model:
Up to 1954: A7
Star Twin
After 1954: 
A7 Shooting star

Year:
1946 – 61

Engine:
Four stroke twin cylinder

Capacity:
Up to 1950:
495 cc / 30.2 in.
After 1950: 
497 cc / 30.3 in/

Bore x Stroke:
66 x 72.6mm

Cooling System:
Air cooled

Compression Ratio:
Star Twin:
6.6:1
Shooring Star:
7.2:1

Oil Capacity:
2.6 L / 5.5 US pints

Carburetor:
Up to 1954:
Amal remote float type 6
After 1954: 
Amal 376 monobloc

Exhaust:
Twin, chrome

Generator:
Dynamo

Ignition :
Lucas magneto

Spark plug:
Star Twin:
L10S
Shooring Star:
NA 10

Battery:
12 V

Starting:
Kick

Max Power:
495 cc: 
19 kW / 26 hp @ 5800 rpm
497 cc: 
22 kW / 30 hp @ 5800 rpm

Clutch:
Multi-plate, dry

Transmission  :
4-Speed

Final Drive:
Chain, 98 links

Gear Ratios:
1st 13.62 / 2nd 9.28 / 3rd 6.38 / 4th 5.28:1

Frame:
Twin cradle

Wheelbase:
1391 mm / 54.8 in

Front Suspension:

Star Twin: Girder
Shooting Star:  Telefork

Rear Suspension:
Shooting Star:
Swinging arm

Front Brakes:
Shooting Star:
8 in

Rear Brakes:
Shooting Star: 8 in

Wheels:
Steel, wire spokes

Front Tyre:
3.25 x 19 in

Rear Tyre:
3.50 x 19 in

Dry Weight :
166 kg / 366 lbs

Fuel Capacity :
16 L / 4.2 US gal or 8 L / 2.1 US gal

Top speed:
495 cc: 137
km/h / 85 mph
497 cc: 
40 km/h / 90 mph