c.1931 Ariel 497cc Square Four 4F Replica
Frame no. none visible Engine no. R818

The Winter Sale - including The National Motorcycle Museum Reserve Collection - Bicester Heritage|12 December 2020, 10:00 GMT|Bicester, Bicester Heritage

c.1931 Ariel 497cc Square Four 4F Replica
Frame no. none visible
Engine no. R818

The Ariel Square Four, announced in 1931, was a genuinely ground-breaking design. It was introduced as an overhead-camshaft 500cc, with two gear-coupled crankshafts and a square four-cylinder layout. The following year it was offered in both 500 and 600cc capacities. At the time it was as radical as any design before or since and was the creation of the great Edward Turner. The vendor of this machine was in possession of most of the bike but was missing a frame and unable to locate one. He was, however, able to acquire a new, reproduction frame which was built with measurements from an original frame and cast lugs as per original. Combined with the original parts he possessed; he was able to rebuild the machine. The engine, four-speed Burman gearbox, forks, wheels etc. are all original items, and even the petrol tank is modified from another Ariel model from 1931. He advises us that he stripped and rebuilt the engine with new valves, valve springs, and oil pump body. He further advises that the big ends, bores, pistons, and camshaft were all in useable condition. Whilst all four gears select, he states that the gearbox layshaft needs replacing to facilitate the speedo drive, and a used one is included with the bike. The magneto requires reconditioning, and there are no internals in the dynamo. In need of completion, this machine will provide a new owner with a budget-level entry to the normally expensive world of early Square Four ownership. Documents with this lot comprise a copy parts book and copy handbook.

Footnotes

As with all Lots in the Sale, this Lot is sold 'as is/where is' and Bidders must satisfy themselves as to the provenance, condition, age, completeness, and originality prior to bidding.

Saleroom notices

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