Classic Ariel Motorcycles

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A Lesson in Perfection: 1959 Ariel Square Four

 Engine: 997cc air-cooled OHV “square” 4-cylinder, 65mm x 75mm bore and stroke, 7.2:1 compression ratio, 42hp @ 5,500rpm (claimed)Top speed: 105mph (approx.)Carburetion: SU, variable chokeTransmission: 4-speed, chain final driveElectrics: 6v, coil and breaker points distributor ignition Frame/wheelbase: Single downtube steel cradle/56in ...

Greg Williams; Photos Jeff Barger | Oct 14, 2020

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