6 MOLNAR’S 500-4 NORTON

Breathing new life into a stillborn 1950s racing project

■ Dohc inline four cylinder ■ Bore and stroke: 54 x 54mm ■ Compression ratio: 15:1 ■ Two valves per cylinder ■ Double hairpin valve springs ■ Gear camshaft drive ■ Gear primary drive ■ Liquid-cooled ■ Forward-facing carburettors ■ Rear-facing exhausts ■ Unit-construction gearbox ■ Five-bearing crankshaft ■ Plain shell big-end and crankshaft bearings ■ Wet-sump lubrication ■ Alloy crankcase ■ Elektron sump ■ Magneto ignition ■ Power output: 80bhp @ 14,000rpm ■ Six-speed gearbox ■ Top speed: 140-150mph