Ariel 4G MK1 Square Four 1948 1000cc 4 cyl ohv - starting up

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Manufacturer: Ariel
Model: 4G-1000 / Square Four / MK1
Year: 1948
Displacement: 995 cc
Cylinder: 4
Engine type: 4-stroke / ohv
Bore / Stroke: 65 x 78 mm
Power: 35hp @ 5.500 rpm
Weight: 211 kg
Top Speed: 141 km/h
Production years: 1936 - 1948
Units: 4.288
Frame number: XP1859
Engine number: CJ895
Designed by the legendary Edward Turner, the Ariel Square Four was first shown at Olympia in 1930. Unique at the time of its introduction, the 'Squariel', as it was swiftly dubbed, featured a single block of four cylinders and twin geared-together crankshafts with pistons phased at 180 degrees. The crankcase was split horizontally, unusually for a motorcycle engine of the period, while the vertical valves were operated by a single overhead camshaft. A supercharged example was raced at the Isle of Man TT in 1931 without success, which was hardly surprising as its makers had envisaged the model as more of a luxury tourer than an out-and-out sports machine. Although launched as a '500', the Squariel was soon enlarged to 601cc with an eye on the important sidecar market, this bigger version being made available for the 1932 model year. In 1937 a total redesign saw it re-emerge as the Model 4G, with 995cc overhead-valve engine, making the Squariel an even more enticing prospect for sidecarists. 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. An exercise in weight shedding saw the cast-iron cylinder head and barrel replaced by alloy components for 1949, the revised model, now capable of 145kmh-plus, being known as the Mark I. Introduced in 1953, the 'four pipe' MkII with redesigned cylinder head elevated the Square Four into the league of genuine 160kmh motorcycles. Square Four production, along with that of all other Ariel four-strokes, ceased in 1959. To date, the innovative Ariel Square Four remains unique in motorcycling history; a true 'gentleman's motorcycle, this refined yet charismatic machine retains an enthusiastic and loyal following, and is highly appreciated by discerning enthusiasts.
This is a rare specification, telescopic front fork and rigid rear end. Only a few bikes left the Ariel work with this specification. The most paint of this bike bears its lovely original paint. This bike is a great runner.
ka001

[@andrewazur8629]

The beast from the south east

[@normanstringfield5277]

I love that typical British motorcycle trait of having the back wheel turn when on the stand. Every Brit bike I have ever seen does that.

[@lanzaralorenzo]

It's unreal how the sound is like... "modern", thanks to the 4cyl layout.

[@mowoggreen7878]

Beautiful, I had the same year and model in 1970, only mine had a dual seat, I also owned a 57 mk2 4 piper, I always thought my 4G was a smoother running bike 😍

[@del5.0]

Perfect!