Page:The Cycle Industry (1921).djvu/123

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109
THE MOTOR CYCLE

youthful and ambitious pedal cyclist was yearning for a motor.

London clubs instituted trials and hill climbing competitions on a big scale, and the advertisement obtained from these largely aided the sale of motor cycles. For a very long time the daily press was extremely cynical respecting motor cycles and, in some cases, they had cause to be. However, Rome was not

The Cycle Industry (1921) p123.jpg

Fig. 29
THE 6-H.P. TWIN CYLINDER ROYAL ENFIELD SIDE-CAR MODEL
The engine has V type cylinders


built in a day, and if some of the incompetent critics on the daily papers had tempered the wind to the shorn lamb a little, the industry would not have been so long climbing the rungs of the ladder of success.

Up to about 1909–10 nearly every motor cycle was fitted with a four-stroke engine, as they are called to differentiate them from the two-stroke type. Briefly, the four-stroke engine has a power impulse, or explosion, every other revolution or every fourth stroke of the piston (down and up being counted as two strokes), whereas the two-stroke has an impulse every revolution or every two strokes of the piston.