Bournbrook, Birmingham. Stand No 40.
The Ariel motor-bicycles have square engines, that is to say, the bore and stroke are equal, both being in this case 85 mm. The valves are mechanically operated. A special feature of the 1911 de Luxe model is a device for modifying the compression at starting; in fact, the makers guarantee the machine to start at a walking pace in less than 10 feet. The device consists of a secondary projection on the exhaust cam, or opposite to the main one, and somewhat to the side of it. By moving a small lever on the handlebar, the cam as a whole is moved along, and the smaller projection lifts the exhaust valve slightly on the compression stroke. The charge being reduced in density, is more easily fired, and the machine starts off in a most docile manner. The variable pulley, which can be adjusted while riding, is a feature for 1911, as it was for 1910; it is made for use either with or without pedalling gear.
Quite a large number of improvements are to be found in different parts of the machines and their equipment. The carrier and tank are on the new lines, and the latter is fitted with larger filter caps, moored to the tank, to prevent loss, inclined lubricating pump, a petrol feeder for ungumming the piston, a ratchet action cut out, which can be operated by the hand, as well as the foot, etc., etc. The new Ariel side-car attachment should be examined, and the fact that the Ariel made the second best time in its class in the T.T. race should not be forgotten.
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