Hip to be Square: 1959 Ariel Square Four MKII

Jim Balestrieri seizes his dream of restoring several mid-century Ariels, including a 1959 Ariel Square Four.

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by Jeff Barger

1959 Ariel Square Four MKII
Engine: 997cc air-cooled OHV “square” four, 65mm x 75mm bore and stroke, 7.2:1 compression ratio,42hp @ 5,500rpm (claimed)
Top speed (approx.): 105mph
Carburetion: Single SU, variable choke
Transmission: 4-speed, chain final drive

Motorcycle Classics Magazine
Motorcycle Classics Magazine
Motorcycle Classics Magazine Featuring the most brilliant, unusual and popular motorcycles ever made!