The original 1,000cc engine design with cast iron cylinder barrels and head remained in production until it was superseded in 1949 by an all-alloy model, later designated the 4G Mk I-1000cc, when a newly-developed, four-exhaust-pipe cylinder head was introduced in 1953. The new, all-alloy model became known as the 4G Mk II-1000cc, or 4GII, and remained in production until 1959.

This example is one of 3,828 produced of that last Square Four model.

New Zealand Classic Motorcycles

The museum formerly at Napier housed an extraordinary collection. It has moved to the home of the World's Fastest Indian.

More information: New Zealand Classic Motorcycles.

Ariel 1000cc 4G