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MotoLibrary Score
43/100Commuter
Power/Weight
0.19 hp/kg
Top Speed
135 km/h
Engine
247 ccm
Technical Overview
1970 BSA B 25 Star Technical Analysis & Specification Breakdown
At the heart of the 1970 BSA B 25 Star classic motorcycle, BSA utilizes a 247 cc (15.1 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 26 HP (19 kW) at 7,250 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 105.3 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the B 25 Star measures 135 kg (298 lbs) wet (curb), translating to a power-to-weight ratio of 0.19 HP/kg (5.19 kg per horsepower). The 14-liter (3.7 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 135 km/h (84 mph).
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
