1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)

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Lot 302
1951 Ariel 995cc 'Square Four' 4G Mark I
Registration no. YVL 869 Frame no. SC490 Engine no. TM650 (see text)

Sold for £ 8,970 (US$ 12,380) inc. premium
1951 Ariel 995cc 'Square Four' 4G Mark I
Registration no. YVL 869
Frame no. SC490
Engine no. TM650 (see text)
Designed by Edward Turner, the Square Four was first shown at Olympia in 1930. Originally an overhead-camshaft 500, the model grew to 601cc before a total redesign saw it emerge as the Model 4G, with 995cc overhead-valve engine, in 1937. Anstey link plunger rear suspension became an option in 1939 but would not be offered again until 1946 when a telescopic front fork replaced the previous girder type. With its limitless reserves of pulling power and innate smoothness, the model was a superb touring mount and a long-time favourite of the sidecar brigade. It was with some justification that Ariel's 1950 catalogue billed their top-of-the-range 4G model as 'The world's most exclusive motor cycle'.

This 1951 example was acquired by the vendor in 2013 from the family who had owned it since 1954. It had been a long-term restoration, unused since the work's completion. The engine was rebuilt by well-known Ariel specialists Draganfly Motorcycles, and a bill on file details the work done at a time thought to be in the early 1990s (the date on the invoice cannot be deciphered). Work carried out included fitting two new cylinder liners; four new pistons and re-bores; crankshafts reground and new big-end shells (0.010" undersize); new main bearings and bushes; exchange camshaft and followers; and the dynamo overhauled. The wheels were rebuilt and new tyres fitted, and the fuel tank refurbished, re-chromed and repainted. The remaining cycle parts were powder-coated black, and a new exhaust system obtained.

The 'Squariel' has not been run since restoration, although the bores have been oiled and the engine turned over at regular intervals. A glimpse down the spark plug holes reveals the new piston crowns, and in view of the lack of use it is recommended that a new owner should carefully re-commission the machine and carry out safety checks prior to running or using it on the road.
Accompanying paperwork consists of a current V5C together with the original RF60 buff logbook and the aforementioned invoice. Also included with the machine are the original (damaged) crankcases, which were replaced when the engine was rebuilt.
Contacts
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
1951 Ariel 995cc 'Square Four' 4G Mark I Frame no. SC490 Engine no. TM650 (see text)
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