BSA B25 Starfire

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BSA B25 Starfire
Production 1968
Class Classic
air-cooled, four-stroke, single cylinder, OHV
Bore / Stroke 66.0mm x 66.0mm
Compression ratio 10:1
Horsepower 26.02 HP (19.4 KW) @ 7250RPM
Transmission Gear box: 4-speed, manual, constant mesh

Final Drive: chain

Clutch: multi-plate with integral cush drive
Suspension Front: telescopic fork
Rear: dual shocks
Brakes Front: drum
Rear: drum
Front Tire 3.25 x 18
Rear Tire 3.50 x 18
Wheelbase 53.9 inches (1369 mm)
Length 85.0 inches (2159 mm)
Width 29.02 inches (737 mm)
Seat Height 31.89 inches (810 mm)
Weight 131.0 kg (wet)
Manuals Service Manual

The BSA B25 Starfire was a air-cooled, four-stroke, single cylinder, OHV Classic motorcycle produced by BSA in 1968. Claimed horsepower was 26.02 HP (19.4 KW) @ 7250 RPM.


A 66.0mm bore x 66.0mm stroke result in a displacement of just 249.0 cubic centimeters.


The bike has a 4-speed, manual, constant mesh transmission. Power was moderated via the multi-plate with integral cush drive.


It came with a 3.25 x 18 front tire and a 3.50 x 18 rear tire. Stopping was achieved via drum in the front and a drum in the rear. The front suspension was a telescopic fork while the rear was equipped with a dual shocks. The wheelbase was 53.9 inches (1369 mm) long.

1968 - 1970 BSA B25 Starfire[edit]

1968 - 1970 BSA B25 Starfire 1968 - 1970 BSA B25 Starfire 1968 - 1970 BSA B25 Starfire 1968 - 1970 BSA B25 Starfire

The 1968 BSA B25 Starfire sports an air-cooled, four-stroke, 249cc, single cylinder powerplant paired to a four-speed, constant mesh manual transmission and can produce a claimed 26 horsepower at 7250 rpm. Standard fittings for this machine include a dual seat, pillion grab rails, a round, chromed headlight, laced wheels, a chromed exhaust system, a telescopic front fork, dual shocks as a rear suspension and a drum braking system in the front and in the rear.

In Media[edit]