B25 Starfire

1969 BSA B25 Starfire Technical Analysis & Specification Breakdown

Positioned in BSA's allround motorcycle lineup, the 1969 BSA B25 Starfire features a 247 cc (15.1 cu in) air-cooled single cylinder, four-stroke configuration. 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.

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.