The Royal Ariel Square Four

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by Jeff Barger
Like many touring bikes (Honda’s Gold Wing comes to mind), the original Square Four was designed with performance in mind.

1953 Ariel 4G MKII Square Four
Claimed power: 45 hp @ 5,500 rpm
Top speed: 100 mph
Engine: 997cc air-cooled OHV “square” four, 65mm x 75mm bore and stroke, 7.2:1 compression ratio
Weight: 425 lb.

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Motorcycle Classics Magazine
Motorcycle Classics Magazine
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