BSA B 25 Star

BSA B 25 Star

The 1970 BSA B 25 Star is a stylish and Classic motorcycle with Air cooled, 247cc, Single, OHV and 25.83 HP (19 kW) @ 7250 rpm.

year icon
Model year
1970
make icon
Make
BSA
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Engine Power
25.83 HP (19 kW) @ 7250 rpm
Speed icon
Top Speed
83.88 mph

Technical Specifications

Engine and transmission

  • Engine type:
    1 cylinders, 4-stroke, Single
  • Displacement:
    247 cc (15.09 cubic inches)
  • Bore × stroke:
    2.64 inch × 2.76 inch (square)
  • Cooling system:
    Air cooled
  • Power:
    25.83 HP (19 kW) @ 7250 rpm
  • Throttle:
    Cable operated
  • Valve train:
    OHV, variable
  • Valves per cylinder:
    2
  • Sparks per cylinder:
    1
  • Fuel supply system:
    Carburetor
  • Ignition type:
    mechanically timed
  • Compression:
    9.5:1
  • Engine mounting:
    Transverse
  • Lubrication system:
    Wet sump
  • Gear box:
    Manual 4-speed
  • Clutch:
    Wet, multiple discs, cable operated
  • Final drive:
    Chain
  • Spark plug pipe type:
    NGK
  • Motor oil:
    Mineral, 10W/40
  • Starter:
    Kick-starter

Dimensions

  • Curb weight:
    297.6 lbs
  • Dry weight:
    262.3 lbs

Chassis and suspension

  • Front
    Suspension:
    Cartridge
    Brake:
    Single Drum
    Tire:
    83 / 100 R18
    Tire pressure:
    0.12 PSI
  • Rear
    Suspension:
    twin shock, Swingarm
    Brake:
    Drum
    Tire:
    89 / 100 R18
    Tire pressure:
    0.14 PSI
  • Frame type:
    iron, Single cradle frame

Other

  • ABS available:
    No
  • Power-to-weight ratio:
    0.14 KW/lbs (7.11 lbs/HP)
  • Acceleration (0-60 mph):
    7.8 sec
  • Top speed:
    83.88 mph
  • Fuel capacity:
    3.7 gals
  • Number of riders:
    2 persons
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