Info off of their site:
http://www.nortonmotorcycles.com/dealers/
Engine type: Parallel twin with push-rod valve actuation, dry sump
Displacement: 961cc
Cooling system: Air
Valve actuation: Push rod, hydraulic lifter, 2 valves per cylinder
Bore x stroke: 88mm x 79mm
Compression ratio: 10.1:1
Power: 80PS @ 6500RPM
Torque: 90Nm @ 5200RPM
Ignition: Crank fired electronic
Euro 3 compliant with electronic fuel injection and multiple 3 way catalytic converter
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Fuel tank capacity: 17 litres (4.5 US gallon)
Dry weight: 188kg (414.5 lbs)
Seat height: 813mm (32 in)
Steering: Fully machined billet yokes, triple clamp lower yokes
Handlebars: Tubular steel in chrome
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If BSA were to make a new bike in the same fashion, I don't know how, but I would get one in my garage.