The 500cc JF's four-stroke, four-valve, twin-port engine still featured exposed valve gear but it had coil ignition, an Amal carburettor and dry-sump lubrication. It developed 19bhp at 5,000rpm and, with its four-speed, foot-change gearbox, provided it with a top speed of 80mph (129kph). It featured the sprung girder front forks and the twin exhaust pipes were upswept with fish-tail silencers. The speedometer is mounted forward of the handlebars while the ammeter and ignition switch are mounted in a panel on top of the petrol tank.
Courtesy New Zealand Classic Motorcycles

Royal Enfield J Series Motorcycles