Built around BSA's allround motorcycle platform, the 1968 BSA B25 Starfire relies on a 247 cc (15.1 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 25.5 HP (18.6 kW) at 7,250 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 103.2 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 B25 Starfire measures 131 kg (289 lbs) dry, translating to a power-to-weight ratio of 0.19 HP/kg (5.14 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,369 mm (53.9 in) wheelbase engineered for quick, flickable steering geometry. The 12.9-liter (3.4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's BSA archive, this model family spans 3 indexed model years from 1967 to 1969, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
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.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
