BSA A65 Star Twin (1962-72)

Posted on by

Make Model: BSA Star Twin / Royal Star


Year: 1962 – 72
Engine: Four stroke, parallel twin cylinder, OHV, 2 valves per cylinder
Capacity: 654 cc / 39.9 cub in.
Bore x Stroke: 75 x 74 mm
Carburetor: Amal monobloc 389/67
Cooling System: Air cooled
Compression Ratio: 8.0:1
Lubrication: Dry sump
Engine Oil: SAE 20W/50
Oil Capacity: 3 L / 5 pints / 0.79 US gal
Exhaust: Twin, stainless steel
Ignition: Twin coil
Spark Plug: Champion N4, 0.5 mm / 0.02 in gap, 14 mm dia thread, 19 mm reach
Battery: Prior 1966: 6V, 13 AH, Lucas RM19 alternator Post 1966: 12V, 9 AH, Lucas RM19 Alternator
Starting: Kick start
Max Power: 40 kW / 54 hp @ 4500 rpm
Clutch: Multi-plate with bult-in cush drive
Transmission: 4 Speed
Final Drive: Chain
Gear Ratio: 1st 11.49 / 2nd 7.32 / 3rd 5.24 / 4th 4.58:1

Frame: Steel tubing, cradle
Front Suspension: Telescopic forks with coil spring – hydraulically damped
Rear Suspension: Coil spring/hydraulically damped
Front Brakes: 20.32 cm / 8 in., drum
Rear Brakes: 17.78 cm / 7In., drum
Wheels: Steel, wire spokes
Front Rim: WM2-18
Rear Rim: WM2-18
Front Tyre: 3.25 x 18 in., ribbed
Rear Tyre: 3.50 x 18 in., K70
Dimensions: Length: 2060 mm / 81.0 in. Width: 711 mm / 28.0 in. Height: 1010 mm / 39.8 in.
Wheelbase: 1372 mm / 54.0 in.
Ground Clearance: 178 mm / 7.0 in.
Seat Height: 813 mm / 32 in.
Wet Weight: 176 kg / 390 lbs
Fuel Capacity: Europe:18 L / 4.8 US gal US: 9 L / 2.4 US gal
Average Consumption: 4.7 L/100 km / 21.3 km/l / 50 mpg
Top Speed: 160 km/h / 100 mph
Colours: Blue, Ruby red
Review: Wikipedia, Classic and Race Bike