BSA B25 (1968-70)

Make Model: BSA B25, B25SS, B25T & B25 Fleetstar


Year: 1968 – 70
Engine: Single, OHV, 4-sroke
Capacity: 249 cc / 15.2 cub in
Bore x Stroke: 67 x 70 mm
Cooling System: Air cooled
Compression Ratio: 10:1 Fleetstar only: 8.5:1
Lubrication: Wet sump
Oil Capacity: 2.25 L / 4.8 US pints
Exhaust: Twin, stainless steel and chrome
Carburetor: Amal Concentric 928/20
Ignition: Coil
Spark Plug: Champion N3, 0.50 – 0.65 mm gap, 14 mm thread
Battery: PUZ5A, 12 V, 10 Ah
Starting: Kick start
Clutch: Multi-plate with integral cush drive
Transmission: 4-Speed constant mesh
Final Drive: B25SS, Fleetstar: Chain, 106 links, Reynolds 110 054 B25T: Chain, 107 links, Reynolds 110 054
Overall Gear Ratio: B25 SS, Fleetstar: 1st 18.33 / 2nd 11.35 / 3rd 8.60 / 4th 6.92:1 B25T: 1st 19.48 / 2nd 12.06 / 3rd 9.14 / 4th 7.35:1
Maximum Power: 19 kW / 25.8 hp @7250 rpm
Frame: Loop frame with single down tube with double cradle for engine
Front Suspension: Coil spring, hydraulically damped

Rear Suspension: Girling coil spring, hydraulically damped
Front Brakes: B25 Fleetstar: 8 x 1.5 in., twin leading shoe, drum B25SS, T: 6 x 0.875 in., single leading shoe, drum
Rear Brakes: 7 x 1.125 in., single leading shoe
Wheels: Steel, spokes
Front Rim: B25SS, Fleetstar: WM2 x 18 B25T: WM1 x 20
Rear Rim: B25SS, Fleetstar: WM2 x 18 B25T: WM3 x 18
Front Tyre: B25SS, Fleetstar: 3.25 x 18 in. B25T: 3.00 x 20 in.
Rear Tyre: B25SS, Fleetstar: 3.50 x 18 in. B25T: 4.00 x 18 in.
Dimensions: Lenght: 2160 mm / 85.0 in. Width: 737 mm / 29.0 in. Height: 1105 mm / 42.5 in
Wheelbase: 1370 mm / 54 in.
Ground Clearance: B25SS, Fleetstar: 178 mm / 7 in. B25T: 190 mm / 7.5 in.
Seat Height: 810 mm / 32 in.
Wet Weight: B25SS, Fleetstar: 131.5 kg / 290 lbs B25T: 130.2 kg / 287 lbs
Fuel Capacity: B25SS, Fleetstar: 13.5 L / 3.5 US gal B25T as well as US models: 9L / 2.5 US gal
Top Speed: 135 km/h / 84 mph (approximately)
Review: Rider Magazine


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